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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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.
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. ASTM does not address this issue, but ISO does not bss it and if it is to be done, advocates a thorough cleaning. The salt spray tests are particularly useful for detecting discontinuities, such as pores and other defects, in certain metallic, izo, anodic oxide and conversion coatings.
In either xin, the exposure to salt spray may be salt water spray or synthetic sea water prepared in accordance with the requirements of the test standard. Chamber volumes vary from supplier to supplier.
In the automotive industry requirements are specified under material specifications. Check out our FAQs.
Salt spray test
These standards describe the necessary information to carry out this test; testing parameters such as temperature, air pressure of the sprayed solution, preparation fin the spraying solution, concentration, pHetc. This climate is maintained under constant steady state conditions.
A discussion started in but continuing through Q. 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. Options include the following: Remember that accelerated testing is not a proper indication of real world performance.
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 iao desired quality. Such tests are commonly referred to as modified salt spray tests.
Salt spray test – Wikipedia
Proof sent to secretariat or FDIS ballot initiated: I’ll really appreciate your help 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.
Any ISO standard is available for this Testing? Hi David, There are several differences between the two specifications, including salt concentration range, salt analysis, water quality, angle of inclination of test nws, corrosivity requirements, I think the temperature is about the only thing that has been standardised.
The longer the accelerated corrosion test, kso longer the process remains out of control, and larger is the loss in the form of non-conforming batches. This test can be used to test the relative resistance to corrosion of aluminium alloys when exposed to a changing climate of acetic acid salt spray, followed by air drying, followed by high humidity, all at an elevated temperature.
All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Something totally different like zinc-alloy plating, organic coatings, etc.
Results are represented generally as testing hours in NSS without appearance of corrosion products e.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
Synthetic seawater solutions are also commonly specified by some companies and standards. A requirement that a component ‘pass’ an accelerated corrosion test isn’t often meaningful until the finishing spec tells you what that means: This page was last edited on 29 Octoberat Daily checking of testing parameters is necessary to show compliance with the standards, so records shall be maintained accordingly.
Equivalence between ASTM B-117 vs. ISO 9227 NSS
The test duration is variable. Different coatings have different behavior in salt spray test and consequently, test duration will differ from one type of coating to another. ASTM G85 is the most popular global test standard covering modified salt spray tests. It also describes the method employed to evaluate the corrosivity of the test cabinet environment.
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. I suggest that you send some parts out for testing according to the ISO standard to see if they meet the spec.