ASTM B The ASTM B Copper-Accelerated Acetic Acid Salt Spray, ( CASS) Test This test is performed in accordance with the specifications found in the. ASTM B Copper Accelerated Acetic Acid Salt Spray (Fog) Testing. Can be used to test the relative resistance to corrosion of anodized aluminium and. Testing Specifications of Cyclic Cycles we have met – ASTM, ASTM B, ASTM B, CASS, ASTM G85, GMW, GMW, SAE J, Ford CETP.
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How to compare ASTM B117 Salt Spray and ASTM B368 CASS Test?
Accelerated corrosion testing is a QA measure often undertaken to get an early indication if something goes out of whack in the processing, such that the components are unlikely to aetm the previously expected period in the real world. I have not seen an industrial requirement that uses a microscopic analysis of pores or corrosion sites. Organic coatings are coatings that are based on organic chemicals basically chemicals that contain carbon.
And only after that can you build a correlation to accelerated testing. Auto Technology is also committed to its customers. If you’re trying to mimic some field failure, you’re talking completely different corrosion mechanisms There astmm no simple bb or factor to convert asrm test to another.
The origin of your An ongoing discussion from through We are developing an alternative to Cadmium plating, and if there is a comparison that someone has done, it would be great to find the results of the comparison, i. Also known as the CASS test, this test is commonly used to evaluate paints on steel as well as to aztm corrosion resistance of various aluminum alloys.
I am just looking to see if anyone has an opinion on this question. Are these parts stainless steel, or a non-ferrous alloy perhaps? Our parts generally are aluminum with Cad Plating over electroless nickel plating. That is, put some parts in neutral salt spray and some in CASS and see what you get. So my question is whether there is any specific requirement of CASS test for threaded, knurled area? Is there any other accelerated tests available to correlate NSS test to avoid the longer time?
How to compare ASTM B Salt Spray and ASTM B CASS Test?
Can be used to test the relative resistance to corrosion of anodized aluminium and. For example, hot dip galvanizing is no doubt the most durable of any finish, often surviving on electrical transmission towers for 75 years or more with no maintenance.
He didn’t say how they defined failure in the test or the field. There is no simple formula or factor to convert one test to another. At the time, it was perhaps the biggest plating-on-plastics line in the country.
CASS Test — Copper-Accelerated Acetic Acid Salt Spray (Fog) Test — (ASTM B368, B117)
They all induce different corrosion mechanisms on different substrates. Other than that, any correlation there may be would only be for a given plating on a given substrate Link to Active This link will always route to the current Active version of the standard.
It’s aastm pages, and then you won’t be guessing whether your procedure complies based on internet rumors: Medias this blog was made to help people to easily download or read PDF files.
It will give you a different corrosion mechanism. Should we consider that a failure? Touchstone performs corrosion testing and accelerated life testing of virtually any material or device.
Please forgive any resultant repetition or failures of chronological order. While atm correlation is important, trying to develop a predictive correlation that doesn’t require real world testing probably won’t work.
Most paints and powder coatings would be organic coatings. It is also applicable to the testing of anodized aluminum. From beautiful Pine Beach New Jersey: You’ll also have to run periodic tests to verify that your correlation wstm still correct.
First a side note about CASS. Touchstone has laboratory tested both coupons and entire components for automotive, aerospace, and other industries. Note 1 — The following standards are not requirements. If they only require that the non-knurled areas pass CASS, then you should be fine. Unfortunately, I think the answer is that you will not know the real world life of your cadmium substitute, or how it compares to cadmium in the real world, except by real world testing.
Keep in mind that both tests have significant variability, so it’d actually take numerous tests, control panels or parts in both tests, multiple cabinets, etc. You appear to be acknowledging that there is no correlation, but then asking whether the correlation would be Uses include research and development, specification acceptance, manufacturing control of product or process, and simulated service evaluations.
I’m planning to use CASS test. I understand that would be a estimate especially considering there would be a difference between what part of the country the vehicle would be “in the field” When ready for the test cabinet, metallic and metallic coated samples are cleaned with an appropriate cleaning or solvent solution. Typical exposure lengths in hours are: Among the tests offered are:. Other materials and coatings corrode in fundamentally different ways such that CASS test results have essentially no bearing on their anticipated life.
We are plating ABS with 20 microns of copper, 10 microns semi-bright nickel, 10 microns of bright nickel, 2 microns of micro porous nickel and finally 0,15 microns of conventional chromium coating.