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Coating solution for forming insulating film with excellent corrosion resistance property and film close adhesion property and film intensity without chrome and a method for making the insulation film

A corrosion-resistant, chromium-coated technology, used in metal material coating processes, coatings, anti-corrosion coatings, etc., can solve problems such as deterioration, the inability of the film to show tightness, restrictions, etc.

Inactive Publication Date: 2009-08-26
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] In addition, among chromium-free coating agents, since the thin film formed by the chromium-free coating agent cannot express tightness due to the unique film filling effect of chromium compounds, there is a limit in preventing deterioration of film characteristics.

Method used

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  • Coating solution for forming insulating film with excellent corrosion resistance property and film close adhesion property and film intensity without chrome and a method for making the insulation film
  • Coating solution for forming insulating film with excellent corrosion resistance property and film close adhesion property and film intensity without chrome and a method for making the insulation film
  • Coating solution for forming insulating film with excellent corrosion resistance property and film close adhesion property and film intensity without chrome and a method for making the insulation film

Examples

Experimental program
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Effect test

Embodiment 1

[0083] A non-oriented electrical steel sheet containing 0.1% by weight of silicon and having a thickness of 0.50 mm and an area of ​​120×60 mm was used as a sample, and various treatment liquids were applied at a rate of 0.5-6.0 g / m using a coating bar. 2 The amount coated on the sample.

[0084] Subsequently, the samples treated in the described method were dried at a temperature of 650° C. for several hours and then air-cooled.

[0085] Afterwards, in order to evaluate the characteristics of the samples, at 100% N 2 The sample was heat-treated at 750°C for 2 hours in the atmosphere to implement the stress relief annealing (SRA) process. The insulation performance of the sample was evaluated by measuring the current value when a voltage of 0.5V and a current of 1.0A were applied under a pressure of 300PSI. The adhesion Evaluated by measuring the minimum diameter of the arc when the sample forms an arc with a diameter of 10, 20, and 30 to 100 mm respectively and then bent at ...

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Abstract

The invention provides a chromium-free coating composition for forming an insulation film, the composition having excellent corrosion resistance and excellent film adhesion and film strength after stress relief annealing (SRA), including, based on a lOOg phosphate solution having a solid content of 60% by weight, in which monoaluminum phosphate and monozinc phosphate are mixed at a 1 :1 ratio: 0.5-5g of a solid in which cobalt hydroxide and strontium hydroxide are mixed at a 1 :1 ratio: 100-300g of an emulsified polyester resin or an emulsified epoxy resin having a solid content of 20% by weight; 3-10g of aluminum silicate having a solid content of 20% by weight; and 0.1-6g of a titanium chelate.

Description

technical field [0001] The present invention relates to a method of manufacturing a non-oriented electrical steel sheet, and more particularly, to a chromium-free coating composition for forming an insulating film having excellent resistance to stress after stress relief annealing (SRA). corrosion resistance and excellent film adhesion and film strength, the composition exhibits excellent corrosion resistance and film adhesion without using chromium at the time of insulating film formation or after insulating film formation, and can improve film properties, such as punchability, weldability, adhesion, lamination factor, shape, etc.; and also relates to a method for forming an insulating film on a non-oriented electrical steel sheet using the coating composition. Background technique [0002] Generally, non-oriented electrical steel sheets are used for iron cores of electric motors or generators. These non-oriented electrical steel sheets are divided into electrical steel sh...

Claims

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Application Information

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IPC IPC(8): C09D5/25C23C22/07
CPCC08K3/10C08K3/34C09D5/08C09D167/00
Inventor 韩敏洙金正雨金在宽金成浩
Owner POHANG IRON & STEEL CO LTD
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