Zinc Chromate?

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kramttocs
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Zinc Chromate?

Post by kramttocs » Thu Apr 18, 2019 2:08 pm

Hi all,
Just ordered a gun and some powder as I'd like to coat some things on a truck restore.
New to all of this needless to say.

I bought a new set of alternator brackets and I believe they are zinc chromate plated?
Here they are: https://www.landlproducts.com/details.a ... temID=1051

I searched zinc chromate on here and found some mention of RO primer?

In short:

1. Can I powder coat them?
2. If so, do I need to do something special for them?

Thanks!

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duke46
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Re: Zinc Chromate?

Post by duke46 » Sat Apr 20, 2019 8:16 am

I am betting you will have to blast the parts back to raw metal but I will ask the guys on a powder coating page and see what they have to say as for as what you will have to do.
Hope to get back with an answer soon.
All I have said is said just for meanness so I don't have to argue with anyone!

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kramttocs
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Re: Zinc Chromate?

Post by kramttocs » Sat Apr 20, 2019 10:17 am

Thanks a lot!

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duke46
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Re: Zinc Chromate?

Post by duke46 » Sun Apr 21, 2019 1:40 pm

Well, I have no luck getting any answers back except one guy agreed with you on what is on them.

With you just starting out I do hope you realize what a mess powder can make in a garage and it can get on every thing unless you have some sort of booth with an exhaust fan and a filter or two and even with that you still may get powder all over the place. At least it will vacuum up.

What ever coating gun you bought and I guess it is a cup gun then only fill it 1/2 to 3/4 full and maybe 10 lbs of air pressure is all you need. And also you have a good ground and most guys use a 5/8" 8' ground rod and then hang their parts off a rod that is also connected to the 8' one. If you just use the ground clip that is on your unit it may work for doing one coat but may not do a 2nd coat. Grounding is the key when applying powder for sure.
All I have said is said just for meanness so I don't have to argue with anyone!

http://www.pcitdad.com" onclick="window.open(this.href);return false;

kramttocs
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Re: Zinc Chromate?

Post by kramttocs » Mon Apr 22, 2019 8:19 am

Thanks for checking on it and thanks for the tips!

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Jay V
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Re: Zinc Chromate?

Post by Jay V » Mon Apr 22, 2019 9:23 am

I would say that is Zinc Plating on them.

I don't think that presents any real issues for coating, but the issue for me would be the surface is too smooth for maximum adhesion.

I would blast them moderately to dull the finish, but not necessarily strip them completely.

kramttocs
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Re: Zinc Chromate?

Post by kramttocs » Mon Apr 22, 2019 10:04 am

Great. I'll give that a shot later this week.
Coated a few parts on Saturday and wish I had gone this route years ago :)

stummel78
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Re: Zinc Chromate?

Post by stummel78 » Thu Apr 25, 2019 9:57 am

If I had to coat over zinc plated parts I blast very soft to have a better adhesion...but you don't have to blast the comlete zinc away...I think it's called sweaping

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