NMX‑SSC‑30 / Rev 00 / corrosion & environmental test / fog · rate · hours 2026 · Product Page

NMX-SSC-30 · ENGINEERED TO ORDER — SALT SPRAY & CORROSION TEST CHAMBERS

A climatic chamber controls the weather. This one runs chemistry, on a timer.

Name: Salt Spray and Corrosion Test Chamber
Brand: Neometrix

You can judge a climatic chamber on whether it holds a setpoint. A corrosion chamber is harder, because its result depends on fog uniformity, collection rate, concentration, pH and temperature all at once — and if one of them drifts you have not run a harsher test or a gentler one. You have run a different test, which compares with nothing, including the same part last year. So the brine is filtered and metered into saturated warm air; it is spread by a dispersion tower rather than a jet, so fog settles evenly instead of blasting whatever sits in front of it; the collection rate is measured at more than one position, because fog is not data until someone catches it; and the whole thing runs unattended for weeks, which is why alarms and automatic refill are part of the machine. Equipment of this class has been quoted against successive salt spray, corrosion and dust chamber requirements for defence test laboratories; no delivered salt spray or corrosion test chamber is claimed — the class is engineered to order.

Enquire — corrosion chambers Capability sheet (PDF)

Illustrative of the class — a large rectangular salt fog corrosion test chamber in a clean laboratory: a smooth off-white moulded plastic body on a low grey painted steel stand, a clear transparent acrylic gabled lid closed into a channel around the rim with a faint even mist visible inside, a plain light-grey control enclosure with a blank dark panel at one end, a translucent plastic brine reservoir tank alongside with a clear level tube, and neat runs of translucent tubing and brushed stainless pipe between tank and chamber, no people and no readable markings

Fig · 01 The chamber — a moulded body that must outlast the fog it makes, and a lid that seals without corroding

Governs

fog uniformitynot merely fog

Proven by

collection ratemeasured, not assumed

Runs

weeksunattended

Wetted parts

immuneor it contaminates

Status

engineered to orderquoted class

ISO 9001 / 14001 Engineered to order Environmental test franchise Corrosion & particulate Noida · India

Overview

The fog is not data until somebody catches it.

A corrosion chamber full of mist looks like it is working. Whether it is depends entirely on numbers nobody can see from outside — how much settles, where, how salty it is, and at what pH. Everything on this page follows from that.

Illustrative of the class — looking down into the open interior of a corrosion test chamber: smooth off-white moulded plastic walls sloping inward, a tall slender conical dispersion tower standing in the centre with a small nozzle at its base, angled specimen racks of white plastic rod on either side holding plain rectangular blank metal coupons leaning back at a consistent angle, and a clear glass funnel seated in a plain glass measuring cylinder standing on the chamber floor to collect the settling fog, all surfaces wet with a fine even condensate, no people and no readable markings

Fig · 02 Inside — a tower that makes fog settle rather than spray, coupons at one angle, and a funnel that turns mist into a number

Uniformity is the whole machine. The point of an accelerated corrosion test is to compare — this coating against that one, this batch against the last. That only works if every specimen experiences the same environment. Put a bare nozzle in a box and it does not: the coupons near the jet are scoured, the ones behind them are sheltered, and the ranking you get out is a map of where things sat. So the fog is broken up and slowed by a dispersion tower until it drifts rather than blows, the chamber walls are shaped to circulate it, specimens are held at a consistent angle so runoff behaves the same way on each, and they are spaced so nothing shadows or drips onto anything below it.

And then it is proven, not assumed. The single commonest way a corrosion test is quietly invalidated is that nobody measured the collection rate — how much solution actually settles per unit area per hour. It is measured with something deliberately simple: a funnel of known area draining into a cylinder, at more than one position in the chamber, so both the rate and its evenness can be shown. What is collected is then checked for concentration and pH, because a small pH drift does not make the test slightly different — it changes which corrosion mechanism is running.

The machine also has to survive itself. Warm salt fog is not an occasional visitor here; it is the operating condition, for hundreds or thousands of hours at a stretch. Every wetted surface, seal, heater, sensor and the drain has to be immune to it. A chamber that starts to corrode is worse than one that simply wears out, because the products of its own corrosion enter the fog and it becomes a contaminant — and the tests it invalidates from then on will look perfectly normal.

Equipment of this class has been quoted against successive salt spray, corrosion and dust chamber requirements for defence test laboratories. No delivered salt spray or corrosion test chamber is claimed: the class is engineered to order, and the record is stated as it stands.

Even

Every coupon, the same fog

Dispersion tower, chamber geometry, one specimen angle — so the result is about the coating.

Proven

A funnel and a cylinder

Collection rate measured at more than one position, with concentration and pH checked, never assumed.

Immune

It outlasts its own fog

Every wetted part chosen for a lifetime in warm brine — a chamber that corrodes contaminates.

Architecture

Make it, spread it, prove it, outlast it.

The schematic follows the test — brine atomised into saturated air, spread by a tower rather than a jet, the settled rate measured at more than one position, and weeks of unattended running — then the machine: chamber, brine and atomiser, air and temperature, collection and drain.

FIG · 03CORROSION CHAMBER ARCHITECTURE · CHAMBER + LID / BRINE + ATOMISER + TOWER / AIR SATURATION + TEMPERATURE / COLLECTION, pH + NEUTRALISED DRAIN

Fig · 03 A result about the coating, not about where the coupon sat

Arc · 01

Chamber & Lid

Moulded corrosion-proof body, sealed lid, heated walls — specimen supports at one consistent angle, spaced so none shadows another.

Arc · 02

Brine, Atomiser & Tower

Reservoir, filtration, metering, atomiser and dispersion tower — the tower is what turns a jet into a fog that settles.

Arc · 03

Air Saturation & Temperature

Oil-free air humidified above chamber temperature — regulated so the fog neither dries on the way in nor falls as rain.

Arc · 04

Collection, pH & Drain

Funnels and cylinders, concentration and pH, alarms — and a neutralised drain, because effluent is treated rather than discharged.

Qualifying a coating, a plating or a fastener? Send the specimen size and quantity, the test type and duration, and the collection rate and concentration your standard demands — a clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Reference chambers, built to the test schedule.

The parameters below describe reference chambers. Internal volume, specimen capacity, brine and air capacity, heating and control all follow from three givens: the specimen size and quantity, the test type and its duration, and the collection rate and concentration the governing standard demands.

Illustrative of the class — the service side of a corrosion test chamber in a clean laboratory: a tall cylindrical stainless steel air saturator vessel standing upright with a clear sight glass on its side, a translucent plastic brine reservoir beside it, a compact brass and stainless pressure regulator with a blank round gauge face turned partly away, brushed stainless pipework and translucent flexible tubing running between them in tidy parallel runs held by small clips, a plain grey painted steel support frame and a shallow stainless drain tray below, no people and no readable markings

Fig · 04 The service side — saturator, brine and regulation, where the fog is decided before it ever reaches a specimen

Where corrosion testing goes wrong

The collection rate is never measured — far and away the commonest invalidation, because the chamber looks identical whether the rate is correct or half of it. The saturator sits below chamber temperature — the incoming air dries the fog instead of carrying it, and the test silently slows down. Specimens are crowded — the back row is tested by the front row, and runoff from one lands on another. pH drift goes unwatched — a small shift changes which corrosion mechanism is running, so the numbers are not comparable even with themselves. Wetted parts are not fully immune — the machine corrodes, its products enter the fog, and it becomes a contaminant. An interruption is treated as a pause — a stopped test is a void test, not a delayed one. And the drain simply discharges — warm acidified brine into a laboratory system that was never meant to take it.

So the discipline runs the other way. The collection rate is measured at more than one position and recorded with the run, and the collected solution is checked for concentration and pH. The saturator is held above chamber temperature with its pressure regulated. Specimen racks fix the angle and the spacing, and capacity is stated honestly rather than by how many coupons will physically fit. Every wetted part, seal, heater and sensor is selected to be immune for the life of the machine. Level control, automatic refill and alarms on air, temperature and level protect the continuity that the result depends on. And the drain is neutralised, so what leaves is treated.

Full specification — expand

System	Salt spray & corrosion test chamber — chamber & lid, brine & atomiser with dispersion tower, air saturation & temperature control, collection, pH & neutralised drain
Governing Idea	A chemistry experiment with a timer on it — fog uniformity, collection rate, concentration, pH and temperature together; miss one and you have run a different test, not a harder one
The Rule	Uniformity is the whole machine — a chamber that fogs unevenly ranks specimens by where they sat rather than by how good they are, and the results still look like results
The Constraint	It must survive what it dishes out — a chamber that corrodes becomes a contaminant and quietly invalidates every test after it
Fog Generation	Filtered, metered brine atomised into oil-free compressed air humidified through a saturator held above chamber temperature
Distribution	Dispersion tower rather than a bare jet, so fog settles gently and uniformly; specimens at a consistent angle, spaced so none shadows or drips onto another
Verification	Collection rate measured with funnels and cylinders at more than one position; concentration and pH of the collected solution checked and recorded with the run
Continuity	Unattended running for hundreds or thousands of hours — level control, automatic brine refill and alarms on air pressure, temperature and level; an interruption voids a test rather than pausing it
Materials	Every wetted part, seal, heater, sensor and the drain selected to be immune to warm salt fog for the life of the machine
Effluent	Neutralised drain — what leaves the machine is treated rather than discharged into a laboratory system that was not designed for it
Calibration	Chamber and saturator temperature, air pressure and the collection rate all calibrated and traceable, and re-proven after any change to nozzle, tower or racking
Test Types	Neutral, acetic and copper-accelerated salt spray; cyclic corrosion combining fog, dry and humidity stages; and sand and dust as the particulate sibling
The Split	The site's climatic and environmental test chambers control temperature and humidity — they control the weather, and are judged on holding a setpoint. This machine controls a chemistry, and is judged on a collection rate. Different physics, different failure modes, different acceptance. The thermal vacuum chamber takes the same specimens to vacuum and thermal extremes with no chemistry at all, and the vibration and shock test system is the mechanical half of the same qualification campaign
Scope Boundary	Ours: chamber & lid, brine & atomiser systems, dispersion tower, air saturation & temperature control, collection & pH instrumentation, alarms & the neutralised drain, calibration, acceptance test procedures, installation, commissioning, documentation, training, spares & AMC — including build to the customer's specification. Bought-in certified: compressors, instruments, control hardware. The customer's: the specimens, their coatings and the acceptance criteria
Status	Engineered to order — equipment of this class quoted against successive salt spray, corrosion and dust chamber requirements for defence test laboratories; no delivered salt spray or corrosion test chamber is claimed

PDF · 1 page

Salt Spray & Corrosion Test Chamber — Capability Sheet

Tender Response

Send specimen size, test type & duration — compliance matrix in two working days

Variants

One discipline, four chambers.

What changes is the chemistry, the cycle, the size of the article — or whether the attacker is salt at all.

Var · 01

Neutral, Acetic & Copper-Accelerated

The classic salt spray family — same machine, different brine chemistry and pH control, and a different acceptance band.

Var · 02

Cyclic Corrosion Chambers

Fog, dry and humidity stages in programmed sequence — closer to real exposure, and far more demanding of control.

Var · 03

Walk-In Corrosion Chambers

Whole assemblies rather than coupons — where uniformity across a large volume becomes the hardest part of the design.

Var · 04

Sand & Dust Chambers

The particulate sibling — circulating dust at controlled concentration and velocity instead of settling fog.

Applications

Wherever a finish has to be believed.

The laboratories that qualify coatings and the industries that depend on them lasting.

A · 01Defence quality-assurance laboratories

A · 02Coating & plating qualification

A · 03Fastener & component acceptance

A · 04Automotive & rail components

A · 05Marine & offshore hardware

A · 06Electronic enclosure qualification

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 Why is the collection rate such a big deal?

Because it is the only direct evidence that the chamber is doing what the test says it does — and because a chamber running at the wrong rate looks exactly like one running at the right rate. The test specifies how much salt solution should settle on a given area in a given time. That single number is the product of several things that can each drift: the brine feed, the atomising air pressure, the chamber temperature, the geometry of the tower, even the age of a nozzle. None of them is visible from outside; all you see is mist. So the rate is measured directly, with equipment chosen for being impossible to misread — a funnel of known collecting area draining into a cylinder, left for a stated period, and read as a volume. It is done at more than one position because the number matters less than its evenness: a chamber can deliver a perfect average rate while starving one corner and drowning another, and the specimens in those two places will produce results that disagree for reasons that have nothing to do with their coatings. The rate is measured before a campaign, recorded with the run, and re-proven whenever the nozzle, the tower or the racking changes — because each of those changes the thing being measured.

Q · 02 Why does the air have to be saturated, and warmer than the chamber?

To stop the fog evaporating on its way in. The atomiser needs compressed air to break the brine into a mist, but compressed air is dry — and dry air introduced into a warm chamber does two unhelpful things: it evaporates water out of the droplets, so what lands on the specimens is more concentrated than intended, and it lowers the humidity in the chamber, so the surfaces do not stay continuously wet. Continuous wetness is the entire mechanism of the test; a surface that dries out is not corroding. So the air is bubbled through a saturator — a heated vessel of water — before it reaches the nozzle, leaving it fully humidified. The saturator is deliberately held above chamber temperature, because air cools slightly as it expands through the nozzle and travels, and air that arrives at exactly chamber temperature will have shed some moisture on the way. Running the saturator a little hotter means the air arrives still saturated. Get this wrong in the other direction, though, and you get the opposite failure: too much moisture and the fog condenses and rains down the walls, flooding the lower specimens and starving the upper ones. It is a balance, and it is why saturator temperature and air pressure are both controlled and recorded rather than set once and forgotten.

Q · 03 What does pH have to do with a salt spray test?

More than most people expect — it decides which chemistry you are actually running. A neutral salt fog test is specified within a narrow pH band, and drift outside it does not make the test a bit faster or a bit slower; it changes the corrosion mechanism, and therefore what the results mean. Several things push it around. The water and salt themselves carry impurities. Dissolved carbon dioxide from the compressed air acidifies the solution slowly over a long run. Some specimens shed corrosion products into the collected solution that shift it the other way. And in the accelerated variants the pH is deliberately moved — acetic and copper-accelerated versions are exactly that: the same machine with a different, tightly controlled chemistry, chosen because it correlates better with service life for particular finishes. So pH is checked on the collected solution, not just the reservoir, because the collected sample is what the specimens actually saw. It is recorded with the run alongside concentration and collection rate, and those three together are what let one laboratory's result mean something to another laboratory — which is the only reason to run a standardised test rather than simply leaving parts outside.

Q · 04 How is a corrosion chamber different from your climatic chambers?

They look similar and they are engineered around completely different problems. A climatic chamber controls the weather: temperature and humidity, sometimes altitude, driven by refrigeration, heaters and a humidifier, and judged on how tightly and how quickly it holds or changes a setpoint. Its hard problems are thermal — pull-down rate, uniformity of air temperature, defrost, and the load the specimen itself adds. A corrosion chamber controls a chemistry. Its setpoints are a collection rate, a concentration, a pH and a saturator temperature, and it is judged on evidence collected in a cylinder rather than on a trace from a sensor. Its hard problems are fluid and material ones: making a fog that settles evenly rather than blowing, keeping the air saturated so droplets neither concentrate nor rain, and building the entire wetted envelope from materials that will not corrode over a decade of continuous exposure. The two machines also fail differently, which matters more than it sounds: a climatic chamber that drifts shows you a wrong number, and you can see it. A corrosion chamber that drifts shows you nothing at all — the mist looks the same — which is exactly why the verification is physical, external and deliberately crude.

Q · 05 What happens if a long test is interrupted?

In almost every case the test is void, not delayed — and that is why continuity is treated as part of the machine rather than as good housekeeping. These runs last hundreds or thousands of hours, and their whole premise is continuous wetness. If the fog stops, the specimens begin to dry. Drying is not a neutral pause: surfaces change, corrosion products dry out and alter, and when the fog restarts the sequence of attack is different from the one that would have happened without the break. Since the result is only meaningful by comparison with other runs of the same duration, an interruption of unknown effect makes the comparison unsafe, and a careful laboratory restarts rather than resumes — which can mean losing weeks. So the design attacks every common cause of interruption. Brine level is monitored and refilled automatically rather than manually topped up. Air pressure, saturator level and both temperatures are alarmed, so a developing fault raises attention before it becomes a stoppage. The alarms are designed to be noticed out of hours, because these tests run through nights and weekends unattended. And the machine is built so routine attention — checking collection, sampling for pH — can happen without breaking the run, since a test that must be opened to be verified is a test that interrupts itself.

Q · 06 What do you build, what is bought in — and what is claimed?

Divided honestly. What Neometrix provides: the chamber and lid — a moulded corrosion-proof body, a sealed lid, heated walls for an even wall temperature, and specimen racking that fixes the angle and the spacing; the brine and atomiser system with reservoir, filtration, metering and the dispersion tower that turns a jet into a settling fog; the air saturation and temperature control, held above chamber temperature and regulated so the fog neither dries nor rains; the collection and pH instrumentation with funnels and cylinders at more than one position; alarms, level control and automatic refill for the continuity a long run depends on; the neutralised drain, so effluent is treated rather than discharged; calibration and acceptance test procedures demonstrating the collection rate and its evenness on handover; and installation, commissioning, documentation, training, spares and AMC — including build to the customer's own specification, which is how requirements of this class are framed. What is bought-in certified: compressors, instruments and control hardware — proprietary products of established makers, integrated rather than imitated. What is the customer's: the specimens, their coatings, and the acceptance criteria the results are judged against. And the record, stated plainly: equipment of this class has been quoted against successive salt spray, corrosion and dust chamber requirements for defence test laboratories. No delivered salt spray or corrosion test chamber is claimed; the class is engineered to order, around the test schedule it has to serve.

↗

The qualification family from Neometrix.

Weather, vacuum, shaking — and the one that runs a chemistry.

↗ Weather

Climatic & Environmental Test Chambers

Temperature and humidity, judged on holding a setpoint — not on a collection rate.

↗ Vacuum

Thermal Vacuum Chamber

The same specimens taken to vacuum and thermal extremes, with no chemistry at all.

↗ Mechanical

Vibration & Shock Test System

The mechanical half of the same qualification campaign.

Browse all Neometrix product lines.

Get a quotation

Send the specimens
and the test schedule.

The projects desk replies within two working days with a clause-by-clause compliance matrix and a budgetary quotation. Write to [email protected] or use the form.

Enquire — corrosion chambers Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — SALT SPRAY & CORROSION TEST CHAMBERS CHEMISTRY, WITH A TIMER · UNIFORMITY IS THE WHOLE MACHINE · IT MUST SURVIVE WHAT IT DISHES OUT ENGINEERED IN NOIDA · INDIA

A climatic chamber controls the weather. This one runs chemistry, on a timer.

The fog is not data until somebody catches it.

Every coupon, the same fog

A funnel and a cylinder

It outlasts its own fog

Make it, spread it, prove it, outlast it.

Chamber & Lid

Brine, Atomiser & Tower

Air Saturation & Temperature

Collection, pH & Drain

Reference chambers, built to the test schedule.

Where corrosion testing goes wrong

One discipline, four chambers.

Neutral, Acetic & Copper-Accelerated

Cyclic Corrosion Chambers

Walk-In Corrosion Chambers

Sand & Dust Chambers

Wherever a finish has to be believed.

Common questions.

The qualification family from Neometrix.

Climatic & Environmental Test Chambers

Thermal Vacuum Chamber

Vibration & Shock Test System

Send the specimens
and the test schedule.

Similar Products

Share This Page

A climatic chamber controls the weather. This one runs chemistry, on a timer.

The fog is not data until somebody catches it.

Every coupon, the same fog

A funnel and a cylinder

It outlasts its own fog

Make it, spread it, prove it, outlast it.

Chamber & Lid

Brine, Atomiser & Tower

Air Saturation & Temperature

Collection, pH & Drain

Reference chambers, built to the test schedule.

Where corrosion testing goes wrong

One discipline, four chambers.

Neutral, Acetic & Copper-Accelerated

Cyclic Corrosion Chambers

Walk-In Corrosion Chambers

Sand & Dust Chambers

Wherever a finish has to be believed.

Common questions.

The qualification family from Neometrix.

Climatic & Environmental Test Chambers

Thermal Vacuum Chamber

Vibration & Shock Test System

Send the specimensand the test schedule.

Similar Products

Share This Page

Send the specimens
and the test schedule.