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topic 5424

What is the Thickness of Zinc Plate from an Acid Based Plating Process?


We currently have some parts that are manufactured from 1010 steel and are zinc plated per ASTM B633 [link by ed. to spec at TechStreet] Fe/Zn 25 type II (minimum plating thickness .001"). Our current plater called to inform us that he is changing his plating bath from alkaline to acid chloride. He says with the new bath he can only plate .0002 - .0004" thick. Is this true for all acid chloride baths? Is this the current trend for zinc platers?

If it is so, we would have to consider changing our thickness requirements, but we need the corrosion resistance of the thicker zinc plate.

Eileen Clevenger
aircraft engine systems - Rockford, Illinois USA


Since I don't know your part, etc., I can't be sure, but, historically, acid zinc baths suffer from low throwing power. Depending upon the part shape, this may be what is limiting your supplier.

James Totter
James Totter, CEF
- Tallahassee, Florida


Chloride zinc baths can plate 0.001" thicknesses. The problems with this thick of a deposit is twofold. First, chloride zinc does not have good distribution; meaning the high current density (HCD)areas will plate much faster than the low current density (LCD)areas. If your 0.001" requirement is for a LCD, then the HCDs will have a thickness of 0.003 - 0.004". Second, due to the organics in the chloride zinc formula, thick chloride zinc deposits are prone to chipping. I would suggest you find another plater in the area who does alkaline zinc plating.

Rick Painter
- Cleveland, Ohio


I would like to think that your plater has a reason for moving from Alkaline to Acid Zinc, and you can plate the thickness you require with lower current, longer times and assisted by Air or Cathode agitation, without altering your spec for less thickness. We use both the systems and each has its own pros and cons.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind supporting advertiser
Bangalore, Karnataka, India

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