FAQ's

You will get efficient and thoughtful service from Hunter Special Steel Co., Ltd.

1. APPEARANCE OF SODIUM DICHROMATE

What is this?

A small amount of Sodium Dichromate is generally added to the quench water bath for passivation.

Cause

Contact us to discuss your requirements of hot dipped steel coil. Our experienced sales team can help you identify the options that best suit your needs.

Although the recommended quantity of Sodium Dichromate is about 0.15 to 0.3%, occasionally when topping up, more is added.  This often results in a dark yellow to brown colour on the galvanized surface.  The darker colour will provide enhanced initial corrosion protection.

Effect / Remedy / Responsibility

This can be accepted since there is no adverse effect on corrosion control.

The galvanizer should maintain the concentration of Sodium Dichromate at about 0.15 to 0.3%.

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