Preparing method and application for corrosion resistant composite SiO2 film

A corrosion-resistant and film-forming technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problems of high film-forming rate, uneven surface, cracking, etc., and achieve the effect of reducing the corrosion rate

Active Publication Date: 2007-09-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high film formation rate, it is easy to cause defects such as poor film crystallization, surface inhomogeneity, and cracking.
Each research method has its own advantages and disadvantages, and some disadvantages are determined by the method itself, which is inevitable

Method used

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  • Preparing method and application for corrosion resistant composite SiO2 film
  • Preparing method and application for corrosion resistant composite SiO2 film
  • Preparing method and application for corrosion resistant composite SiO2 film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]The substrate adopts SUS304 stainless steel sample of φ40mm×1mm. First, the sample was polished to 1200# with 600-1200# corundum water abrasive paper in sequence, deionized water was ultrasonically cleaned for 30 minutes, and degreased with acetone. Each group of experiments uses 3 samples in parallel, separates them with brackets, places them in ordinary Na-Ca glass containers, adds LiBr solution (about 100ml each time) with a concentration of 60% and PH=9.5, and puts them into a high-temperature and high-pressure reaction kettle Inside. According to the physical properties of LiBr solution at high temperature, the saturated vapor pressure is 0.17MPa when the concentration of LiBr solution is 60% and the temperature is 190°C, and the pressure at normal temperature is 0.23MPa according to the ideal gas state equation. First use a vacuum pump to evacuate the system to control the oxygen content in the kettle, so that the absolute pressure in the kettle is 1.30kPa to avoi...

Embodiment 2～4

[0029] Control the film-forming temperature at 200°C, adjust the concentration of LiBr solution to 45%, 55%, and 60%, respectively, and pour N 2 The pressure is 0.47, 0.29, 0.21MPa. All the other operating methods and process conditions are the same as in Example 1. The composition content and thickness of the prepared film are shown in Table 1. And measured the dynamic anodic polarization curve of the film formed in 200 ℃, 55% LiBr solution, it can be seen that pitting corrosion is effectively suppressed within the scope of investigation, and the corrosion resistance of metal materials is improved.

[0030] Table 1 List of film composition and thickness at different concentrations at 200°C

[0031]

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Abstract

This invention relates to a preparation method for anti-corrosion films on metal surfaces characterizing in improving a high temperature water-heating method by applying Na-Ca glass as a main Si source, LiBr solution as the Si solvent and an activation agent of metal base as well, therefore, the activation of the metal base and the SiO2 deposition are carried out at the same time, and film composition can be interluded effectively, successive heat treatment is not necessary and an inorganic heat-preservation and anti-corrosion film is prepared. The main components of the film are SiO2 and oxide of Fe and Cr and oxidation films of different components can be prepared by adjusting the activation speed of the base and deposition speed of Si.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion and metal surface modification, and relates to a method for preparing a corrosion-resistant thin film on a metal surface. Especially related to: Using LiBr solution as the activator of the matrix and the solvent of the insoluble matter to improve the hydrothermal method to prepare corrosion-resistant SiO 2 , iron oxide, chromium oxide composite thin film method. Background technique [0002] At present, heat exchangers are widely used in various industries, especially in petroleum refining, chemical industry, refrigeration and other industrial heat exchangers, which mostly use highly corrosive working fluids. The hydrogen and rust generated during the corrosion process will affect the normal operation of the system and reduce the service life of equipment materials. , in severe cases, it will also cause deep corrosion pits. Especially the pitting corrosion and crevice corrosion of stainles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12C23C18/04
Inventor 马学虎陈宏霞陈嘉宾白涛
Owner DALIAN UNIV OF TECH
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