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topic 5778

How to Increase Zinc Passivation Life


Dear readers, I am in to surface finishing business, and at present in a mess, kindly help me. I want to give blue -bright finish to the zinc plated components; but at the same time (with the same appearance )I want the enhanced life in salt spray resistance.( similarly black passivated components should also withstand more no of hrs in s.s.test)the process should be devoid of lacquer. Please reply me as soon as possible. Thnx.

Vrishali Sumant Dalvi.
- Mumbai, Maharashtra,india


Vrishali, at this time I do not feel you can obtain more than maybe 48 hrs. salt spray ( ASTM B117 [link by ed. to spec at TechStreet] ). No matter what thickness zinc.

Bill Hemp
tech svc. w/ chemical supplier - Grand Rapids, Michigan


Dear Vrishali, SS hours can be increased only if you use water based lacquers available through GW or other suppliers. Alternatively think about alloy plating. regards.

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

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Dear Vrishali, for enhancing SS life for Blue passivation,you can use trivalent chrome passivation with Top coat.Which will enhance your salt spray life upto 72 hrs.


Sanjaykumar Kulkarni
Electrical conduit fittings - Pune, Maharashtra

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