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Best finish or coating for rust resistant stainless steel screws

Best finish or coating for rust resistant stainless steel screws

Best finish or coating for rust resistant stainless steel screws

(OP)
Which is the best finish for rust resistant screws for wood for outdoor use? Zinc and then painted over?

RE: Best finish or coating for rust resistant stainless steel screws

Dear Harry.,

The Painting System depends on the material of the screws. What is the material of the screws?

Regards.

DHURJATI SEN
Kolkata, India

RE: Best finish or coating for rust resistant stainless steel screws

If the screws really are stainless steel then you don't want to paint them at all. But you may need to clean them.
If they are plain steel then there are many two coat and three coat system that have proven to have very long life.

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P.E. Metallurgy, Plymouth Tube

RE: Best finish or coating for rust resistant stainless steel screws

Aluminum-zinc coatings outperform standard zinc formulations by a significant margin.

RE: Best finish or coating for rust resistant stainless steel screws

(OP)
Thanks for your help. I've decided to use A4 stainless steel screws, possible with a black oxide finish. I've chosen A4 (316) stainless steel because it is more corrosion resistant than other types of stainless steel. I know that the black oxide coating won't provide corrosion resistance, its just for aesthetics. The screws won't be cleaned because the coating will wipe off after a while and turn the screws silver again. So I'm going to look for some thick wax to put over the top of the screws. Do you happen to know roughly how often the wax should be applied? Please could you tell me if you think its more like every 3 months, or every 3 weeks?



RE: Best finish or coating for rust resistant stainless steel screws

What is the exposure? Lots of sun and very hot? Lots of rain?
The more abuse the more often.
Just be advised that if your wax serves to trap moisture under the heads of the screws then you may be accelerating crevice corrosion and/or galvanic corrosion.
But why cost them?

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P.E. Metallurgy, Plymouth Tube

RE: Best finish or coating for rust resistant stainless steel screws

Generally, stainless steel (such as SS 316) has own corrosion resistance against atmosphere, except for marine environment or insulated pipe. Actually, the definition of stainless steel is the steel which is having more than 11.5% Cr (SS 316 --> 18% Cr) and it is to form own protective oxide film(ex., Cr2O3) on the surface and does not require any coating at all against atmospheric corrosion, generally.

Lee SiHyoung,

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