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Embrittlement of grade 10.9 hot-dip galvanized fasteners

June 25, 2010

We are hot-dip galvanizing 10.9 grade fasteners.
Will pickling by phosphoric acid prevent or reduce hydrogen embrittlement on such jobs?

Shot-blasting is an option but the threaded portion may be damaged. also lead time after shot blasting and galvanizing is a concern

Abbas Rangoonwala
galvanizer - Mumbai, India

July 17, 2010

Sir:

What is the tin (Sn) content of your molten zinc bath?

Regards,

Dr. Thomas H. Cook
Galvanizing Consultant - Hot Springs, South Dakota, USA

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