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topic 3507

Vinyl Wash Primer on G-90 Hot Dip Galvanized Sheet Steel


(1999)

We are using a 2 Part Wash Primer Per DOD-P-15328 [link by ed. to spec at TechStreet], following hot alkaline cleaning, rinsing, blow drying, as a pretreatment for "dry" non-oiled, non-chromated G-90 Hot Dip Galvanized Sheet Steel, for the application of a military epoxy primer, and ultimate CARC topcoat. This systems is a recommended pretreatment in Mil-Std-193 (which I know has been cancelled). My question - is this an acceptable pretreatment for G-90 zinc coated steel for the subsequent coatings application. In addition what is Mil-P-12879, this was also referenced in Mil-Std-193 as the desired pretreatment? Any and all assistance is greatly appreciated. Thank You. Sincerely, Bob Hathaway

robert hathaway
trucks - Oshkosh, Wisconsin


(1999)

Bob, Though I have never painted hot dip galvanized, I do paint a lot of zinc plated fasteners. If the part does not have a supplemental conversion coating over the zinc, then the wash primer is the way to go. (We also use DOD-P-15328) Your galvanize probably does not have a conversion coating over it.

I do not know of a Mil-P-12879, but do know a Mil-T-12879 as called in 193. I do not have a copy of it as it has been cancelled. However, 12879 cancellation notice refers to ASTM D2092 [link by ed. to spec at TechStreet] Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting. Depending on your contract, you may still be help to 12879, but the technical information in the ASTM is still a good reference.   ASTM 2092 Contains methods A-F for pretreating this material. Method D-Acid-base Resinous Treatment is DOD-P-15328 [link by ed. to spec at TechStreet]. So again, this points that wash primer is the way to go.

Kelly Draper
- West Plains, Missouri


July 9, 2008

What is G90 HOT-DIP GALVANIZED

QIANGZONGLIANG KWZL
Plating shop employee - CAI JIA PO


July 10, 2008

Hi,

It means a coating weight of 0.90 ounces per square foot.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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