Method for surface treatment of electrical steel sheet

Details Method for surface treatment of electrical steel sheet Method for surface treatment of electrical steel sheet

1985-10-09

1986-10-21

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 62, C23C 2226

Patent

active

046183779

ABSTRACT:
The insulating film comprised mainly of phosphate or chromate is improved in its insulation property required for the laminated core e.g., a transformer, the blanking property required for manufacturing the core sections from the electrical steel sheet, and the lamination weldability. The organic resin particles used for controlling the surface roughness of the film are preliminarily treated with a dispersion improver, and then added to the emulsion resin, which is then mixed with the phosphate or chromate.

REFERENCES:
patent: 3783034 (1974-01-01), Kitayama
patent: 3793073 (1974-02-01), Kitayama
patent: 4032675 (1977-06-01), Irie

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