Need complete chemical-related information on galvanizing process.

A. Hi, Javed. We have hundreds of threads about galvanizing topics including baumé, acids, % of aluminum, etc. Please use the search engine to locate relevant threads. You're certainly welcome to start new threads whenever you wish, but asking for "complete galvanizing process" is hopeless; people can't possibly summarize the subject in a paragraph or two :-)

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

A. Sir:

Automatic pipe galvanizing is about 10 times more difficult than general after fab galvanizing. Part of this is due to short kettle times (e.g. 1 minute or so). Thus the flux must be "GOOD." Also the inside diameter of the pipes are many times four times thicker in zinc than the outside diameter. This is mainly due to bad flux. Temperature of the flux is critical also. Too hot causes corrosion on the outside diameter of the pipes in the bundles and then black spots. Too cold of flux causes much zinc spatter in the kettle. Pipes handling equipment is also extremely important. Walking beams are best-- end-on rollers are worst because they rub off the flux.

For aluminum, I like between 0.001% to 0.003% in the zinc and properly alloyed into the zinc. Higher than this causes many problems.

Regards,