Morning! Back to my request yesterday, we need to know the chemical composition of the coating that Yu Huei used for problematic screws. I know there should be a few layers, base zinc coating, chemical conversion film and ceramic coating, so could you please ask Yu Huei to provide me the details chemical composition of the ceramic coating?
We just like to know why there is higher rate of rusting in place where this ceramic coating has contact with aluminum washer used for these screws? Could you please help me with this? And please let me know if you have question.