Silicon dioxide coating resisting to high temperature and corrosion and preparation method and application thereof

Abstract

The invention discloses a silicon dioxide coating resisting to a high temperature and corrosion and a preparation method and application thereof, and belongs to the technical field of silicon dioxide coatings. The silicon dioxide coating resisting to the high temperature and corrosion and the preparation method and application thereof solve the technical problems that current preparation of silicon dioxide coatings is usually conducted under the condition of a high temperature, industrial production is thus not facilitated, generally the hydrophobic performance is poor, the coatings are easily affected by steam in air, and the service life is short. The preparation method comprises the steps that absolute ethyl alcohol is equally divided into two parts, one part of absolute ethyl alcohol and tetraethoxysilane are mixed and stirred to prepare a solution A, the other part of absolute ethyl alcohol and deionized water are mixed and stirred and then fluorosilane coupling agents are added dropwise to prepare a solution B, the solution A and the solution B are mixed and stirred under the conditions of heating in a water bath and reflux condensation, N,N-dimethyl formamide is slowly added dropwise, then nitric acid is added and stirred for reaction to prepare a glue solution, and a silicon steel sheet with an oxidation film removed is subjected to dipping and pulling through the glue solution and then subjected to secondary thermal treatment. The silicon dioxide coating resisting to the high temperature and corrosion is used as a turbine blade surface wear-resisting coating.

Description

technical field [0001] The invention belongs to the technical field of silicon dioxide coatings; in particular, it relates to a high-temperature and corrosion-resistant silicon dioxide coating and its preparation method and application; the product of the invention is used as fan blades, water turbine blades, and the like. Background technique [0002] Cracks in turbine blades seriously threaten the safe operation of the unit and reduce economic benefits. Blade cracks are fatigue cracks, which are mainly caused by alternating stress. If the blade cracks are found during the inspection, they generally need to be repaired. Cracked blades tend to have a shorter service life after repair welding, especially in machine pits. Blade cracks not only reduce economic benefits due to downtime and reduce power generation, but also directly affect the safe operation of the unit. The emergence of the serious problem of frequent blade cracking of large and medium-sized water turbines in...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the technical problems that the current preparation method of silica coating generally needs to be carried out under high temperature conditions, which is not conducive to industrial production and generally has poor hydrophobic performance, is easily affected by water vapor in the air, and has a short service life; and Provided is a high temperature and corrosion resistant silicon dioxide coating and its preparation method and application

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