ISO NSS. adv. auto technology banner. A discussion started in but continuing through Q. We have a customer, that we supply some zinc. Information to the interpretation of the result. The salt spray test is done according to DIN EN ISO (NSS). The paint thickness is measured. The salt spray (or salt fog) test is a standardized and popular corrosion test method, used to Other important relevant standards are ISO, JIS Z and ASTM G The most common test for steel based materials is the Neutral Salt Spray test (often abbreviated to NSS) which reflects the fact that this type of test.

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nsz Electroplated zinc-nickel steel parts can last more than hours in NSS test without red rust or 48 dn in CASS test without red rust Requirements are established in test duration hours and coatings shall comply with minimum testing periods.

This test can be used to test the relative resistance to corrosion of coated or uncoated aluminium alloys and other metals, when exposed to a changing climate of acidified synthetic seawater spray, followed by a high humidity, both at an elevated temperature. Synthetic seawater solutions are also commonly specified by some companies and standards.

Salt spray test

Daily checking of testing parameters is necessary to show compliance with the standards, so records shall be maintained accordingly. Check out our FAQs. There is a general historical consensus that larger chambers can provide a more homogeneous testing environment. The zinc carbonates are not produced when a hot-dip galvanized specimen is exposed to a salt spray fog, therefore this testing method does not give an accurate measurement of corrosion protection.


ASTM G85 is an example of a test standard iwo contains several modified salt spray tests which are variations to the basic salt spray test.

ISO – Corrosion tests in artificial atmospheres — Salt spray tests

Hi David, There are several differences between the two specifications, including salt concentration range, salt analysis, water quality, angle of inclination of test panels, corrosivity requirements, I think the temperature is about the only thing that has been standardised. Test specimens are placed in an enclosed chamber, and don to a changing climate that comprises the following 3 part repeating cycle.

Retrieved from ” https: From Wikipedia, the free encyclopedia. The principle application of the salt spray test is therefore enabling quick comparisons to be made between actual and expected corrosion resistance.

Equivalence between ASTM B-117 vs. ISO 9227 NSS

You will then need to talk to your customer about the kso of using one specification in lieu of the other. Such details are provided in the appropriate product specifications. So if you want to know how to set up a salt spray cabinet or how to make the salt solution, then B is a reference.

Testing periods range from a few hours e. It does not specify the dimensions or types of test specimens, the exposure period to be used for a particular product, or the interpretation of results.

This is followed by 2. Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 jso repeating cycle.

Although the majority of salt spray tests are continuous, i. The salt spray or salt fog test is a standardized and popular corrosion test method, used to check corrosion resistance of materials and surface coatings.

This spray is set to fall-out on to the specimens at a rate of 1. Hi Sergio, ASTM B does not address corrosion behavior of test specimens, but describes the parameters for conducting a salt spray test.


Most commonly, the time taken for oxides to appear on the samples under test is compared to expectations, to determine whether the test is passed or failed. It has also been found suitable for testing anodic and organic coatings on aluminium. Something totally different like zinc-alloy plating, organic coatings, etc. This page was last edited on 29 Octoberat Painted surfaces with an underlying hot-dip galvanized coating can be tested according to this method.

Equivalence between ASTM B vs. ISO NSS

March 16, A. Monday to Friday – What do you want to test? The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time. Salt spray testing is an accelerated corrosion test that produces a corrosive attack to coated samples in order to evaluate mostly comparatively the suitability of the coating for use as a protective finish.

A requirement that a component ‘pass’ an accelerated corrosion test isn’t often meaningful until the finishing spec tells you what that means: But benchmarking performance is something altogether different. If there is a minimum volume required by a particular salt spray test standard, this will be clearly stated and should be complied with.

Cyclic corrosion testing is better suited to this. The longer the accelerated corrosion test, the longer the process remains out of control, lso larger is the loss in the form 92227 non-conforming batches. The number of cycle repeats and therefore the test duration is variable.