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Use of sulfuric acid for pickling mild steel components




We wish to start a project for pickling of mild steel components with a view to phosphating in Colombo, Sri Lanka. Please inform the optimum concentration of sulfuric acid we must use.

LESLIE MENDIS
CONSULTANT - Colombo, Western province, Sri Lanka
May 17, 2008



May 23, 2008

10% by volume is usual. However, sulfuric acid is dangerous to handle. Equally effective is sodium bisulphate (also called sodium acid sulphate) It is a powder and safe to handle (use a mask when handling to prevent inhailing dust. Although, it is not very dusty. Another slightly more expensive but very effective is sulfamic acid. Also a powder material not dusty. Use about 60 g/L of either material.
It is not good practice to over etch. This step is to remove rust and/or other oxides in preparation for phosphatizing.

don baudrand
Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics" [on Amazon or AbeBooks affil links]
           and "Plating ABS Plastics" [on Amazon or eBay or AbeBooks affil links])




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