Black plating for Carbon steel 1

[Redpoint]

Can anybody tell me where I can find a plating house that can do non-silver black alloy plating cost effectivly? Enthone-OMI and MacDermid both sell the chemicals for these types of processes, but I have not had much success in finding who they sell to. If anybody can tell me another type of black coating that will withstand upwards of 300 hrs salt spray, I would appreciate it.

 

[RIVetron]

What about using a dry black oxide coating?<br>
Ref Mil-C-13924C<br>
<br>
I've specified it for a variety of applications without failure.<br>
<br>
Paul R

 

[drmar]

I wouldn't use black oxide for sea spray applications. We used it on springs that were used indoors and still got corrosion. I have seen other black coatings, but VERY expensive.

 

I would not recommend black oxide for your application. We use a black E-coating on our wiper links, which our salt spray tested. I believe we use a vendor out of Buffalo, NY<br>
I don't have the specifics on hand, but I will get them for you if applicable.<br>

 

[Redpoint]

I have looked at E-coat. The only problem is that on this part is a machined hole for a press fit bearing. That means that the part would have to be masked, which is also cost prohibitive.<br>
P.S. Thanks for the suggestions.

 

[tcampbe1]

How about Autodeposition? This is a non-electrolytic process so it coats all surfaces evenly, ours is .0007&quot; thick. Possibly you could still do your press fit. The material is a vinyl polymer that is very tough and salt spray resistant. We have gone to it from black zinc plating (another possibility for you). The bonding involves removal of an iron atom from the steel surface and a vinyl molecule gets chemically substituted in its place, so it's a very strong bond. Henkel (Parker AmChem) makes the chemicals and perhaps they can find you a vendor.