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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The salt spray test has little application in predicting how materials or surface coatings will resist corrosion in the real-world, because it does not create, replicate or accelerate real-world corrosive conditions. This spray is set to fall-out on to the specimens at a rate of 1.
Toby Padfield – Troy, Michigan. A personal good afternoon to all, I am Jose of Curitiba, I am a painting inspector, I am a specialist in the area of Salt Spray, and have a problem and knowing of the competence of all readers in corrosion, perhaps they can help me. These standards describe the necessary information to carry out this test; testing parameters such as temperature, air pressure of the sprayed solution, preparation of the spraying solution, concentration, pHetc.
That’s the only way to know for sure. The longer the accelerated corrosion test, the longer the process remains out of control, and larger is the loss in the form of non-conforming batches. Results are represented generally as testing hours in NSS without appearance of corrosion products e. I am needing to know if a gradual table of corrosion in assay exists of Salt Spray, if this table exists and if anyone would be able to post it, I will be thankful. The neutral salt spray NSS test particularly applies to – metals and their alloys, – metallic coatings anodic and cathodic- conversion coatings, – anodic oxide coatings, and – organic coatings on metallic materials.
Chamber volumes vary from supplier to supplier. There is a general historical consensus that larger chambers can provide a more homogeneous testing environment. Is 927 possible to reduce test duration by some accelerated Testing? Monday to Friday – 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.
Such details are provided in the appropriate product specifications. Dear Brian and Davey, Thank you very much for your answers.
A requirement that a component ‘pass’ an accelerated corrosion test isn’t often meaningful until the finishing spec tells isso what that means: But benchmarking performance is something altogether different. Something totally different like zinc-alloy plating, organic coatings, etc. Hot-dip galvanizing produces zinc carbonates when exposed to a natural environment, thus protecting nds coating metal and reducing the corrosion rate.
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. Salt spray testing is an accelerated corrosion nws 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.
Views Read Edit View history. 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.
ISO dun the guidelines for proper measurement of corrosion resistance for hot-dip galvanized specimens. It also describes the method employed to evaluate the corrosivity of the test cabinet environment.
Salt spray tests in accordance with DIN EN ISO NSS / AASS / CASS | IGOS, Solingen
Remember that accelerated testing is not a proper indication of real world performance. What do you want to test? Salt spray testing is popular because it is relatively inexpensive, quick, well standardized, and reasonably repeatable.
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.
The salt spray methods are all suitable for checking that the quality of a metallic material, with or without corrosion protection, is maintained. Requirements are agreed between customer and manufacturer.
Corrosion tests in artificial atmospheres – Salt spray tests
But which, is any, accelerated test is appropriate depends on what the finish is, and what you hope to test against. March 16, A. You will then need to talk to your customer about the possibility of using one specification in lieu of the other.