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Participant

Join Date: May 2019
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Powder Coating of Stainless Steel 316L

05/23/2019 12:29 AM

Hello

I want to powder coat stainless steel 316L can some help me with:

What is recommended to prepare the surface? Is it enough to use passivation ?

Some of my sheet metal parts have Fasteners (designated PEM) FH4 can i perform passivation when they already installed ? because if i install them after the passivation will not help when machine can contaminate the surface

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#1

Re: Powder coating of stainless steel 316L

05/23/2019 1:23 AM

..." Surface preparation is probably the cause of the poor adhesion of the powder coating. Not all stainless steels accept phosphate pretreatments to the same extent; some being more reactive to the chemicals in the pretreatment process, and others being more inert. What you have written makes perfect sense. If you want better success with 316 stainless you might need to change the pretreatment chemicals to more aggressive reactants, or you might need to provide some physical profiling of the surface so that the powder coating can adhere chemically and physically."...

https://www.paintcenter.org/rj/jul05j.php

https://reliantfinishingsystems.com/cleaning-pretreatment-primer-part-one/

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#2
In reply to #1

Re: Powder coating of stainless steel 316L

05/23/2019 1:34 AM

Thank you for the fast replay.

Do you know if it possible to make Passivation on top off Fasteners that is FH4 (400 serious sst) already passivated part from manufacture is will i damage it or is it OK ?

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#3
In reply to #2

Re: Powder coating of stainless steel 316L

05/23/2019 7:07 AM

The best, and certainly the quickest, way to answer the question would be to contact the vendors in #1⇑ by telephone, and ask them directly.

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#4
In reply to #2

Re: Powder coating of stainless steel 316L

05/23/2019 2:11 PM
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#5

Re: Powder Coating of Stainless Steel 316L

05/24/2019 11:04 AM

Chemical finishing and powder coating parts with installed fasteners both present problems.

The fastener must be compatible with the finishing solution. Solar Eagle's link provides some great info.

Parts with fasteners require extra rinsing and may still entrap the finishing solution between the part and the fastener. The solution may bleed out over time and cause staining or failure of a top coat. The finishing solution may remain in place and cause corrosion.

Once you have clean parts and begin to powder coat them the next problem crops up. The fasteners almost always have an air pocket around them and the outgassing of that air can cause bubbles or other issues with the powder coat.

Good luck!

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