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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Retrieved from ” https: This climate is maintained 9227 constant steady state conditions. Remember that accelerated testing is not a proper indication of real world performance. Check out our FAQs.

Equivalence between ASTM B-117 vs. ISO 9227 NSS

Dear Brian and Davey, Thank you very much for your answers. May 21, A. Nds using this site, you agree to the Terms of Use and Privacy Policy. This test is also referred to as an ASS test.

It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the nxs of an author’s employer. 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.

Corrosion tests in artificial atmospheres – Salt spray tests

ISO standards by standard number. This produces a corrosive environment of dense salt water fog also referred to as a mist or spray in the chamber, so that test samples exposed to this environment are subjected to severely corrosive conditions. Electroplated zinc-nickel steel parts can last more than hours in NSS test without red rust or 48 hours in CASS test without red rust Requirements are established in test duration hours and coatings shall comply with minimum testing periods.


Failure to meet this requirement implies instability in the chemical process of the pre-treatment, or the paint quality, which must be addressed immediately, so that the upcoming batches are of the desired quality. Salt spray testing is popular because it is relatively inexpensive, quick, well standardized, and reasonably repeatable.

Hi David, There are several differences between the two specifications, including salt concentration range, nss analysis, water quality, angle of inclination of test panels, corrosivity requirements, I think the temperature is about the only thing that has been standardised.

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Testing cabinets are manufactured according to the specified requirements here. Daily checking of testing parameters is necessary to show compliance with the standards, so records shall be maintained accordingly. Is it possible to reduce test duration by some accelerated Testing? Monday to Idn – Views Read Edit View history. The appearance of corrosion products rust or other oxides is evaluated after a pre-determined period of time.

Most commonly, the isp taken for oxides to appear on the samples under test is compared to expectations, to determine whether the test is passed or failed. From Wikipedia, the free encyclopedia.

Hi Sergio, ASTM B does not address corrosion behavior of test specimens, but describes the parameters for conducting a salt spray test. The first climate isi comprises a continuous indirect spray of neutral pH 6. We ido tests of our products under ISO What do you want to test? They are not intended to be used for comparative testing as a means of ranking different materials relative to each other with respect to corrosion resistance or as means of predicting long-term corrosion resistance of the tested material.


The number of cycle repeats and therefore the test duration is variable. In the automotive industry requirements are specified under material is. The most appropriate test cycle and 927 solutions are to be agreed between parties. 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.

Toby Padfield – Troy, Michigan. Although popular in certain industries, modified salt spray testing has in many cases been superseded by Cyclic corrosion testing CCT The type of environmental test chambers used for modified salt spray testing to ASTM G85 are generally similar to the chambers used for testing to ASTM Bbut will often have some additional features, such as an automatic climate cycling control system.

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These acidified test solutions generally have a pH of 3. But which, is any, accelerated test is appropriate depends on what the finish is, and what you hope to test against. If there is a minimum volume required by a particular salt spray test standard, this will be clearly stated and should be complied with. Regards, Ted Mooney, P. ASTM G85 is the most popular global test isk covering modified salt spray tests.