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Phosphate coating pre-wash

Does using a Hydrochloric Acid pre-wash before Phosphate coating present a greater risk of hydrogen embrittlement to steel hardened to Rockwell 38-43C than a sulfuric Acid pre-wash would.

Michael Ripley
- Co. Durham, England
2005

2005

FOR THE HEAVY IRON PHOSPHATE YOU HAVE TWO WAYS
THE FIRST PROCESS TO USE A PHOSPHODEGREASING FORMULATION (ONE PRODUCT USED FOR IRON PHOSPHATE THEN RINSE)

THE SECOND PROCESS TO USE AN ALKALINE DEGREASER HAS A GOOD ETCHING EFFECT FOR BAD SURFACE CONDITIONS ( dirt, natural oxide,....).
THEN RINSE
THEN PHOSPHODEGREASING , RINSE , DI RINSE

Ahmed Fouad Serag Eldin
Ein Shams - Cairo - Egypt

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