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Ratio for caustic soda solution

What should be the ratio for caustic soda [affil links] solution used for degreasing in hot dip galvanizing

Suresh T.
- Noida,U.P, India
February 10, 2010

Suresh,

Ratio of caustic to what?

Brian Terry
Aerospace - Yeovil, Somerset, UK
February 12, 2010

February 12, 2010

Sir:

Most hot dip galvanizers that use H2SO4 (sulfuric acid)pickle use caustic soda [affil links] (sodium hydroxide) at 10% solution. Most hot dip galvanizers that use HCl (hydrochloric acid) pickle use caustic soda at about 5% to 8%. The usual temperature for caustic soda solution is from about 60C to 70C.

Regards,

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

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