Chromium-free stress coating capable of improving surface tension of oriented silicon steel, and preparation method thereof
A surface tension, oriented silicon steel technology, applied in the coating and other directions
Active Publication Date: 2014-04-09
武汉钢铁有限公司
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[0009] In view of the prior art, the stress coatings for oriented silicon steel are all chromium-containing coatings, and the chromium-free coatings have poor insulation, low temperature resistance, and poor surface quality. The shortcoming is to provide a kind of high temperature resistance, which produces a large tension in the steel plate, reduces the iron loss of the steel plate, improves the adhesion of the coating, and improves the magnetic properties. It can increase the surface tension of the oriented silicon steel. Chromium-free stress coating and preparation method thereof
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[0029] The present invention will be described in detail below:
[0030] Table 1 is a list of values of various embodiments and comparative examples of the present invention;
[0031] Table 2 is a list of main process parameters of each embodiment and comparative example of the present invention;
[0032] Table 3 is a list of performance detection conditions of various embodiments of the present invention and comparative examples.
[0033] The embodiments of the present invention are produced according to the following steps:
[0034] 1) First, phosphate: 20% ~ 50%, silicate: 0.5% ~ 5%, borate: 0.1% ~ 5%, colloidal silica: 35% ~ 60%, nitrate: 0.05% ~ 3%, Ce: 0.01% ~ 1%, add deionized water and mix well;
[0035] 2) Bake the above-mentioned mixture at 300 ~ 500 ℃, and control its moisture content at 0.1%;
[0036] 3) For sintering, control the sintering temperature at 800-900 ℃, and the sintering time is no more than 5 minutes; set aside.
[0037] Table 1 Value list of e...
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A chromium-free stress coating capable of improving the surface tension of oriented silicon steel comprises 20-50wt% of phosphate, 0.5-5wt% of silicate, 0.1-5wt% of borate, 35-60wt% of colloidal silica, 0.05-3wt% of nitrate, 0.01-1wt% of Ce, and the balance deionized water. A preparation method of the coating comprises the following steps: mixing 20-50wt% of phosphate, 0.5-5wt% of silicate, 0.1-5wt% of borate, 35-60wt% of colloidal silica, 0.05-3wt% of nitrate and 0.01-1wt% of Ce, adding deionized water, and uniformly mixing; baking the above obtained mixture at 300-500DEG C to control the water content be 0.1%; and sintering for later use. The coating does not contain the chromium element harmful to the environment or human bodies, the coat obtained by using the coating can provide a tension force same to or larger than that of a chromium-containing stress coat for an oriented silicon steel plate and has a magnetic improvement degree reaching or better than that of the chromium-containing stress coat, and the iron loss of the oriented silicon steel plate with the coat is even 0.19w / kg lower than the iron loss of the oriented silicon steel plate without the stress coat.
Description
technical field [0001] The invention relates to an environmentally friendly paint for oriented silicon steel and a preparation method thereof, in particular to a chrome-free stress paint capable of increasing the surface tension of oriented silicon steel and a preparation method thereof. Background technique [0002] Grain-oriented silicon steel is widely used as magnetic iron core material, in order to reduce energy loss, the iron loss is required to be small. In order to reduce iron loss, it is an effective method to apply tension to the steel plate. Therefore, the purpose of reducing iron loss is achieved by forming a film made of a material having a lower thermal expansion coefficient than the steel plate at high temperature to apply tension to the steel plate. [0003] The conventional method for producing grain-oriented silicon steel sheets is to form a forsterite-based film in the finish annealing process, and then form an insulating film mainly composed of phosphate...
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IPC IPC(8): C09D1/00
Inventor 刘婷胡守天骆忠汉毛炯辉杨皓党宁员雷明
Owner 武汉钢铁有限公司