Insulating coating film for electromagnetic steel sheet
A technology of insulating film and electromagnetic steel sheet, applied in the fields of inorganic material magnetism, metal material coating process, heat treatment equipment, etc., can solve the problems of deterioration of weldability and riveting, and ensure rust resistance, excellent weldability, riveting and other problems. Excellent effect
Active Publication Date: 2018-01-19
NIPPON STEEL CORP
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Problems solved by technology
However, if the film thickness is increased, there will be a problem that weldability and riveting performance will deteriorate
Method used
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[0096] A coating solution containing the components shown in Table 1 was applied to the surface of a 0.5 mm thick electrical steel sheet containing 0.3 mass % Si under the conditions shown in Table 1, and then fired to form insulating coatings on both sides. Thereafter, the structure of the insulating film (presence or absence of enrichment layer) and the enrichment amount were investigated by GDOES and ICP-AES. Then, the evaluation of the rust resistance and solderability of the insulating coating was performed. The results are summarized in Table 1. In the same manner, a chromate insulating film for comparison was prepared and evaluated.
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Provided is an insulating coating film for an electromagnetic steel sheet, the coating film being formed on a surface of a base material of an electromagnetic steel sheet, wherein the insulating coating film contains a phosphate of at least one type of polyvalent metal selected from among Al, Zn, Mg and Ca, a divalent metal-concentrated layer is present at the interface between the insulating coating film and the surface of the base material, and the increase in concentration of the divalent metal in the concentrated layer is not less than 0.01 g / m<2> and less than 0.2 g / m<2>.
Description
technical field [0001] The present invention relates to an insulating coating of an electrical steel sheet. Background technique [0002] An insulating coating is usually formed on the surface of an electrical steel sheet (non-oriented electrical steel sheet and grain-oriented electrical steel sheet) for the purpose of improving rust resistance. Conventionally, as insulating coatings, chromate-based insulating coatings using dichromate as the main raw material have been mainly used. However, since hexavalent chromium is highly toxic, an insulating coating that does not contain chromium is required from the viewpoint of environmental protection during production (hereinafter referred to as "environmental protection"). [0003] A phosphate-based insulating film has been studied as an insulating film replacing the chromate-based insulating film (for example, see Patent Document 1). Furthermore, various phosphate-based insulating coatings have been proposed (for example, see P...
Claims
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IPC IPC(8): C23C22/00C21D9/46C23C22/07H01F1/18
CPCC21D9/46H01F1/18C23C22/47C23C22/74C23C22/08C23C22/26C23C22/20C23C22/22C23C22/07C23C22/12
Inventor 山崎修一高桥克竹田和年藤井浩康赤木阳堀弘树
Owner NIPPON STEEL CORP