Fenrigore There are probably some blurry areas, as there always are. Auto Technology is also committed to its customers. Unfortunately, I think the answer is that you will not know the real world life of your cadmium substitute, ast how it compares to cadmium in the real world, except by real world testing. Some automotive fuel components have this type of plating and CASS testing.
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A discussion started in but continuing through Q. 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. Should we consider that a failure? Should we consider the parts having failed the CASS TEST when pits appear in chromium layer or when the pits have crossed the nickel layer and copper appears?
We thank you for help. Such tests are also often erroneously used as predictors of real life, despite the fact that the corrosion mechanisms are fundamentally different, and the approach will lead to erroneous expectations.
In either application, certain variations in the test procedures for different substrates and coatings may improve their predictive value. ASTM B [affil. Some automotive fuel components have this type of plating and CASS testing. The interpretation of CASS and any other corrosion test data is always subjective and open for debate.
This sort of thing is usually agreed upon between a customer and supplier based on technical experience and judgement. I have not seen an industrial requirement that uses a microscopic analysis of pores or corrosion sites. It could be done, but would you want a manufacturing process that requires constant microscopic analysis of test parts? This type of analysis may be better suited to research or an initial validation. I suggest you strike up this conversation with a nickel-chrome plating chemical supplier.
Please forgive any resultant repetition or failures of chronological order. If component resists hours B test, how many hours should it resist for B test? What is organic coating? Inorganic coating? Chrome plating is organic or inorganic?
Thanks, - Nashua, New Hampshire A. The only way to accurately and reliably develop a correlation is to build one yourself. That is, put some parts in neutral salt spray and some in CASS and see what you get. There is no simple formula or factor to convert one test to another. They all induce different corrosion mechanisms on different substrates. Christian M.
Corrosion Testing Standards
How to compare ASTM B117 Salt Spray and ASTM B368 CASS Test?
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