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Excessive aluminum in zinc?

I am a galvanizer in China. Recently, we experience a lot of bare spot after hot dip galvanizing. We have suspected the aluminum content in the zinc bath is too high, about 0.5%. Please advise how can 'remove ' the excessive aluminum in the zinc.

Tan Kok Teong
galvanizing company - China
2005

2005

For general galvanizing (using zinc ammonium chloride flux solution) the MAXIMUM usable aluminum in the zinc is 0.007%. There are a variety of ways to quickly and easily reduce the aluminum in the zinc. Which of these ways depends on the type of operation. That is: if this is general galvanizing, continuous sheet or whatever. Simply put, more information about your operation is needed to choose the proper method of aluminum reduction or removal.
Regards,

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

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