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Preparing method and application for corrosion resistant composite SiO2 film

A corrosion-resistant, metal-based technology that is applied in the fields of iron oxide, preparation of corrosion-resistant SiO2, chromium oxide composite films, and corrosion-resistant films on metal surfaces. It can solve the problems of high film formation rate, cracking, and uneven surface. problem, to avoid pitting corrosion and reduce the corrosion rate

Active Publication Date: 2009-08-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

[0028] 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 turn, ultrasonically cleaned with deionized water 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 avoid ...

Embodiment 2～4

[0030] 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.

[0031] Table 1 List of film composition and thickness at different concentrations at 200°C

[0032]

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Abstract

The invention belongs to the technical field of metal surface modification and anticorrosion, and relates to a method for preparing a metal surface corrosion-resistant film. It is characterized in that the high-temperature hydrothermal method is improved, soda-lime glass is used as the main silicon source, LiBr solution is used as the silicon solvent and the metal matrix activator at the same time, so that the metal matrix activation and SiO2 deposition are carried out at the same time, and the process of deposition while activation makes the film layer The components are effectively interspersed without subsequent heat treatment, and a temperature-resistant and corrosion-resistant inorganic corrosion-resistant film is prepared. The main components of the film layer are SiO2, iron and chromium oxides, the activation speed of the substrate and the deposition speed of silicon can be adjusted, and oxide films with different composition contents can be prepared. The effect and benefit of the present invention are that the thickness of the prepared film is 3-15 μm, which can significantly improve the corrosion resistance of the heat exchange surface, and has little influence on the heat transfer characteristics; it can improve the performance of transport and storage equipment in corrosive environments. Corrosion resistance, prolong service life.

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