HOME FAQs BOOKS JOBS: Help Wanted Suggestions you are here: Hotline/Forum => Letter 40068

How to judge whether plating passes B117 12 hours or 96 hours?

++++++

Many times I saw clear zinc plating can pass B-117 [link is to spec at TechStreet] 12 hours and yellow zinc plating can pass B117 96 hours. According to ASTM B-633 [link is to spec at TechStreet], it does.

but I have question, what does B117 12 hours or B117 96 hours mean since B117 is just a test method and doesn't specify the rusting degree (the rusting degree specified by D610 [link is to spec at TechStreet] ) ?
I just want to know at how much rust area is allowed to pass B117 12 hours test ? Can you guys please tell me?

thanks,

John
Nabob - ShenZhen, China

++++++

No rust is permitted.

Corrosion resistance requirements are given in ASTM B633 "Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel." After salt spray, Types II & III coated specimens "shall show neither corrosion products of zinc nor basis metal...visible to the unaided eye at normal reading distance" except white corrosion at edges.

Ken Vlach
- Goleta, California

ANSWER or FOLLOW UP POST an unrelated QUESTION HOT Topics

Disclaimer: It is not possible to 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; some names may be fictitious and some recommendations may be deliberately harmful.

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