Sampling method for accurately testing performance of silicon steel magnesium oxide coating

Abstract

The invention provides a sampling method for accurately testing performance of a silicon steel magnesium oxide coating. The sampling method comprises the steps of 1) punching one area of a silicon steel plate before feeding the silicon steel plate into a coating machine, punching out part of the silicon steel plate to obtain the area of the silicon steel plate, then dividing the area into a plurality of to-be-tested steel plates and enabling each to-be-tested steel plate to be connected with adjacent to-be-tested steel plates through connection plates; 2) impressing a plurality of connection plates; 3) feeding the silicon steel plates into a coating machine, coating a magnesium oxide coating liquid on the surface of the silicon steel plate, namely coating the magnesium oxide coating liquid on the surface of the whole to-be-tested steel plate; 4) feeding the silicon steel plate coated with the magnesium oxide coating liquid into a drying oven to dry; 5) taking one to-be-tested steel plate down along the indentation of the connection plates and testing the coating amount of the magnesium oxide and the water content. The sampling method for accurately testing performance of the silicon steel magnesium oxide coating is favorable for accurately monitoring coating quality of the magnesium oxide and consumption amount of magnesium oxide raw material in a production field, so that guarantee can be provided for stable production of oriented silicon steel.

Description

technical field [0001] The invention belongs to the field of steel strip coating, in particular to a sampling method for accurately testing the performance of magnesia coating on oriented silicon steel. Background technique [0002] After decarburization annealing of grain-oriented silicon steel, the surface of the steel strip forms a dense and uniform SiO 2 and Fe 2 SiO 4 The thin film oxide layer as the main component is then coated with magnesia coating liquid on the surface of oriented silicon steel and dried, and rolled into steel coils to enter the high-temperature annealing furnace process. Under high temperature conditions, the magnesium oxide coated on the surface of the steel plate undergoes a solid phase diffusion reaction with the thin film oxide layer to form magnesium silicate Mg 2 SiO 4 Bottom layer of glass film. The magnesium silicate glass film bottom layer can prevent the steel plate from sticking and play a role in purifying the steel, while the glas...

AI Technical Summary

Problems solved by technology

[0006] However, due to the particularity of the magnesium oxide coating, which is attached to the surface of the steel strip in a powder state, it is inevitable that the magnesium oxide coating and the Contact with other equipment or hands will cause the magnesium oxide powder on the surface to fall off or be scraped off, which will directly cause inaccurate testing of magnesium oxide coating amount and moisture content

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