Method of electrolytically etching linear impressions in electri

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials

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148111, 148307, 148308, 156664, 2041291, 20412935, 20412995, H01F 104

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049043129

ABSTRACT:
This invention relates to a method of enhancing linear impressions formed in the surface of grain oriented electrical steel strip, by electrolytically etching said impressions with e.g. citric acid. The impressions may be formed by mechanical wheel scribing or by surface ablation, e.g. by spark discharge or laser treatment, and may be continuous or discontinuous in the form of spots or lines. In accordance with this invention therefore, the initial generation of light impressions in steel strip formed by mechanical wheel scribing or spark ablation techniques can readily be enhanced by application of the electrolytic etching technique to produce a material exhibiting values of power loss (reduced from the original unscribed loss value) which are substantially anneal-proof. In comparison, conventionally scribed material shows no resistance to a high temperature anneal as far as loss reduction is concerned.

REFERENCES:
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patent: 4178194 (1979-12-01), Azzerri et al.
patent: 4750949 (1988-06-01), Kobayashi et al.
"On the Mechanism of Domain Refinement Due to Scratching", H. Pfutzner et al., Japanese Journal of Applied Physics, vol. 21, No. 9, Sep. 1982, pp. L580-L582.
"Laser Processing for Reducing Core Loss of Grain Oriented Silicon Steel", T. Iuschi et al., Journal of Applied Physics, vol. 53, No. 3, Mar. 1982, pp. 2410-2412.
"Domain Control by Spark Ablation", P. Beckley et al., Journal of Applied Physics, vol. 57, No. 1, Apr. 1985, pp. 4212, 4213.

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