Home /
Search 🔍
the Site

Problem? Solution? Chime right in!
(perhaps the world's last 'no registration' site)


"Zinc electroplating onto a galvanized surface"

March 1, 2017

Q. Can we electrodeposit zinc on the hot dip galvanize surface? What precautions are required to get blister free plated surface? Is this process used in any part of the world!


Hemant Shah
switchgear industry - Vadodara, Gujarat, India

March 22, 2017

Q. Blisters are observed on the zinc plated hot dip galvanized structural steel surface. Hot dip galvanized coating thickness @ 85-90 microns & zinc plating @ 10-15 microns.
Can zinc plating carried out on hot dip galvanizing steel surface?

Hemant Shah
switchgear industry - Vadodara, Gujarat, India

April 2017

A. Hi Hemant. My experience is in the electroplating field, where I never once saw zinc electroplating reworked with an extra layer on top of the original; rather, it was stripped before replating every time.

But regarding zinc plating onto a hot dip galvanized surface, where the zinc coating is much thicker, although I've personally not previously heard of it, it's an interesting question. Please flesh it out with more information about your situation and why you might want to do this because certainly the devil is in the details: old work vs. new work ... chrome passivated vs. bare ... uniformly galvanized surface vs. sheared parts where surface is partially zinc and partially steel ... could zinc whiskers pose a problem in the application ... If it's in an effort to salvage defective parts, I think the odds of success go down.

Almost surely the blistering is because of inadequate prep. The parts are not clean and waterbreak-free, or have not been adequately acid activated, or a chromate film is interfering with adhesion. Thanks!


pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey

April 7, 2017

Q. The purpose of the zinc electro plating on Hot dip galvanized surface is to improve the aesthetic look (brightness) of the hot dip galvanized structural steel surface.

Hemant Shah
switchgear industry - Vadodara, Gujarat, India

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA