文档介绍：摘要
金属的热腐蚀是高温腐蚀的一种重要形式。热腐蚀是金属材料在高温含腐蚀性气体工作条件下与沉积在其表面的盐发生反应而引起的高温腐蚀形态。
本论文研究搪瓷涂层对M17合金的腐蚀性能影响。采用离子喷涂技术在M17合金上形成一定厚度的搪瓷釉,并将M17合金和涂有搪瓷涂层的合金在900℃的恒温环境下进行50h的高温腐蚀。实验中采用的腐蚀介质为质量分数为75%(90﹪Na2SO4+10﹪K2SO4)+25%NaCl的混合盐,~,在同一温度下进行50h的热腐蚀;利用电子分析天平,金相显微镜(OM),分析搪瓷涂层对M17抗腐蚀性能的影响。
实验结果表明:喷涂有搪瓷涂层的合金抗热腐蚀能力比原始基材高出很多。原始基材在经混合盐热腐蚀15h后,表面氧化层脱落严重,而搪瓷涂层的失效则在40h之后。
关键词:等离子喷涂;搪瓷涂层;热腐蚀
Abstract
The metal heat corrosion of high temperature corrosion is an important form of. Heat corrosion is the metal material in high temperature corrosive gas work conditions and deposition in the reaction of the surface salt and cause of high temperature corrosion form.
This thesis research to the M17 alloy enamel coating corrosion performance impact. Use ion spraying technology in the M17 alloy form a certain thickness enamel, will M17 alloy and enamel coating with the M17 alloy in 900℃ constant temperature under the environment of high temperature corrosion of 50 h. In the experiments of corrosive medium for quality score of 75% (Na2SO4 + K2SO4) + 25% NaCl, of which the quality of sodium and potassium sulfate points than then sulphonating agent. Will M17 and enamel coating to press ~ mg/cm2 coated in the specimen surface at the same temperature after 50h of heat corrosion. Use electronic analytical balance, metallographic microscope. The corrosion resistant properties of prehensive analysis.
The experimental results show that the enamel coating spray is the M17 corrosion resistance ability to a much higher than the original base material. The original base material in the heat corrosion sulphonating agent after15 h, the surface oxidation layer falls off serious. But the failure of the enamel coating was in after 40 h.
Keywords:Plasma spraying, Enamel coating, Hot corrosion
目录
摘要 I
Abstract II
第1章绪论 1
金属腐蚀控制技术 1
1
阳极保护 1
金属镀层和包覆层 2
涂层 2
加入缓蚀剂 2
3
4
4
离子喷涂工艺的发展