I think a lot of times your customer may require you to passivate parts they’re purchasing. They will know whether or not they need passivation or if they need to abide by the ASTM A967 spec or not. That’s one easy way you can find that out. Another way you could do that is a copper sulfate test that I mentioned earlier. If you’re using that test on passivated parts and you get a failing result, you can still do that on parts that haven’t been passivated to see if there is a need for further corrosion proof. Also, if those parts are susceptible to corrosion or not. I would first ask the customer to see if you have to abide by the ASTM specs and then I would try to copper sulfate test to see how your parts do in that test.