Re: PPAP Requirements including GMW 3179 Zinc Plating Specification Requirements
I have not worked specifically with that GM specification before, but it is pretty standard in our company to ask our suppliers to provide all testing that is required by the specification. If our suppliers cannot provide specific tests we will then send parts out to an A2LA accredited lab for those tests. We generally try to avoid submitting a plated part without full testing.
Have you talked to you customer on this to see what their requirements are? Do they require all of the testing or just the salt spray testing?
I have seen cases before where the customer is alright with just plating thickness and salt spray test submissions and will bypass the adhesion and humidity tests.
The positive is that it is only a 24 hour salt spray which means you could probably get all four of those tests done for relatively cheap depending on the lab you use (200-300 dollars would probably be a safe bet).
Do It Right the First Time.