Two stage method for operating autodeposition bath

Details Two stage method for operating autodeposition bath Two stage method for operating autodeposition bath

1990-06-22

1991-04-30

Beck, Shrive

Coating processes

Immersion or partial immersion

Chemical compound reducing agent utilized

427435, 427302, C23C 2600

Patent

active

050117157

ABSTRACT:
An autodeposition bath for coating steel and similar metals is operated initially with a low content of dissolved iron and at a high oxidizing potential. After the iron content has increased beyond a specific level, such as 1.5 g/l, the oxidizing potential is reduced. This permits continued satisfactory operation of the bath with lower rates of iron accumulation in the bath, so that the need for bath stabilization by removing dissolved iron is deferred.

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patent: 4373050 (1983-02-01), Steinbrecher
patent: 4411937 (1983-10-01), Nishida
patent: 4414350 (1983-11-01), Hall
patent: 4632851 (1986-12-01), Broadbent
patent: 4657788 (1987-04-01), Benton

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