Zinc Plating

Definition:
Zinc plating is a sacrificial protective coating which can be further protected by post-plate treatments such as chromates and sealers. It is considered an inexpensive means of protecting against corrosion.

Spec(s): ASTM B633-15

Thickness classes for coatings:
KEY: Classification #, Service condition, Thickness
Fe/Zn 25, SC4 (very severe), 25um or 0.001″
Fe/Zn 12, SC3 (severe), 12um or 0.0005″
Fe/Zn 8, SC2 (moderate), 8 um or 0.0003″
Fe/Zn 5, SC1 (mild), 5 um or 0.0002″

Finish Type and corrosion resistance:
KEY: Type – Description, Minimum salt spray hours
I – As-plated without supplementary treatments, –
II -With colored chromate coatings, 96
III – With colorless chromate conversion coatings, 12
V – With colorless passivate, 72
VI – With colored passivate, 120

Available Process(es):
Hand-Line
Large Capacity Manual Hoist-Line

Note:
All chromate conversion’s for zinc plating offered in both RoHS compliant and non RoHS compliant.
JMD offers post plate sealers which can increase corrosion resistance to over 300 hours.
JMD can provide corrosion testing according to ASTM B117 per request.
JMD can bake parts on site for relieving hydrogen embrittlement.