Mr. Rogers: "Look for the Helpers. You will always find people who are helping."
As an Amazon Associate & eBay Partner: we earn from qualifying purchases

finishing.com -- The Home Page of the Finishing Industry

-----

Impregnation of zinc parts

Does impregnation on zinc possible before Copper-Nickel-Chrome plating in order to reduce porosity and extend corrosion resistance (reduce blisters)? If yes, which material to use for impregnation? How many salt spray test hour can we get typically?

Christian Doucet
- Montreal, QC, Canada
2002

2002

Vacuum impregnation using a thermosetting epoxy resin is a proven technique to make zinc die castings more plateable. It covers up pores that can entrap chemicals that can lead to blisters or post plate corrosion. MIL-STD-276 details the requirements for basic impregnation.

As an alternative, parts can be heavy copper plated followed by buffing or mass finishing. The soft copper will peen over and bridge the pits. Subsequent nickel / chrome plating will then have little, if any, blistering and pitting.

Milt Stevenson, Jr.
Syracuse, New York

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: