49852

7-tank phosphatization yields rusty, patchy, yellowish work

September 1, 2008

Dear Sir,

We have powder coating plant, we are preparing surface prior to coating i.e. phosphating, we are using seven tank process for it.We are coating, HRC CRC hot rolled angle etc.our problem is that we are not getting proper finish after phosphating.some rust & white , yellow patches are coming after phosphating.we are using phosphorus base chemical. pls. suggest us proper method.

regard

Pravin Kulkarni
- Nashik, India

Hi, Nashik. This is an awfully broad question! When you ask for "the proper method", whole books are written to explain what the proper method is. Have you been successfully phosphating all along and this is a new problem that has suddenly cropped up, or have you never successfully phosphated yet? Thanks.

Regards,

Ted Mooney, P.E.  finishing.com Brick, New Jersey

The proper place to start is with your vendor. If you are using a home brew, no one can help you.

James Watts
- Navarre, Florida