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Study on the Preparation of the Anti-oxidation Protective Coating Based on Attapulgite at High-temperature and Its Application

Author: LiuYueYun
Tutor: ZhangYue；DingHongYan
School: Jiangsu University
Course: Materials Science
Keywords: High-temperature oxidation Coating Attapulgite 60Si2Mn spring steel GCr15 bearing steel
CLC: TQ630.7
Type: Master's thesis
Year: 2010
Downloads: 138
Quote: 0
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Abstract


Steel workpiece in the heating process , often with the CO in the furnace 2 O 2 H 2 < / sub > O oxidizing gas such effect , resulting in the surface of the steel workpiece severe oxidation, which not only loss of the steel material, its mechanical properties decrease , and reduced quality of the workpiece . But also labor-intensive and material resources as well as the removal of oxidation and decarbonization layer . Coating protection technology is an effective way to solve this problem , and the protective effect of good , simple to use , low cost , no pollution . The attapulgite ingredients contains some typical ingredients are an integral part of traditional high temperature oxidation resistant coating , such as the SiO 2 Al 2 O 3 , MgO, etc. . And it has good plasticity , rheology , chemical inertness and thermal stability , as well as drying shrinkage is small , easy to crack , is rich in resources . The excellent characteristics of this series that attapulgite can be used to develop a steel high temperature oxidation coating . This article will melt film shield and redox protection mechanism as paint design principles . Attapulgite as the main raw material , add the right amount of auxiliary materials , orthogonal experimental method to optimize the high-temperature heat treatment to fit 60Si2Mn spring steel and GCr15 bearing steel oxidation paint the best recipe . Of paint protective effect of heating temperature and holding time . Examined the ability of the coating to the absence of oxygen . And from the two aspects of the protective effect and the economy , compared with 202 paint . The metallographic method investigated sample decarburized layer depth changes , theoretically validated the accuracy of the experimental data , and analysis of the paint protection mechanism . The results showed that , the paint can in the 800 ° C ~ 1200 ° C the heat treatment temperature range significantly lower 60Si2Mn spring steel and GCr15 Bearing Steel oxidation loss its effect with 202 coatings considerable , and the protection of the same area as steel than the use of 202 paint able to save 62.46% of the costs .

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