Metal finishing Q&As since 1989

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Corrosion Resistant Finishes

Can anyone offer assistance in suggesting finishes for steel that can withstand 1000 hours of salt spray testing?

Anastasia Jeffes
- Albany, New York
2001

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Cadmium plating or IVD aluminum, about 1.25 mils followed by glass bead peening and a chromate conversion coating. These are just a bit thicker than standard military coatings.

Jim Treglio - scwineryreview.com
PVD Consultant & Wine Lover - San Diego,
California
2001

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2001

I am currently using a strontium zinc primer that gets 2000 hours of salt fog on ferrous surfaces. We do not phosphate (Neither iron nor zinc). We use an organic pretreatment that contains alcohol, phosphoric acid, resin and binders... If you are familiar with MIL-SPEC numbers, the pretreatment is DOD-P-15328 and the primer is MIL-PRF-23377 [on DLA]. I have also used a zinc rich primer that achieved 1000 hours of salt fog. We did have some adhesion issues with it though. To much zinc pigment, not enough resin...

Sorry I am not familiar with the capabilities of platings...

Please feel free to email me kdraper@seistl.com for more particulars. I am sure that there are many other options out there, these are just two that I am familiar with.

Kelly Draper
- West Plains, Missouri, USA

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Zinc - Nickel Alloy plating should easily see you pass the 1000 hour mark.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

2001

Zinc phosphate, E-coat, epoxy primer, urethane topcoat. Should do the trick.

Ron Zeeman
- Brampton, ON, Canada
2002