纳米高锰钢腐蚀行为的研究

发布时间：2018-02-22 11:58

本文关键词： 高锰钢纳米晶模拟海水 NaOH溶液 KHSO4溶液 NaCl溶液　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以原态高锰钢、变形高锰钢和纳米晶高锰钢为研究对象,利用金相和TEM分析方法测定试样的组织结构,利用极化曲线、电化学阻抗谱分析方法研究不同状态高锰钢在不同腐蚀介质环境中的腐蚀行为,并采用扫描电子显微镜对腐蚀后的试样表面形貌进行对比观察。腐蚀介质主要有:模拟海水、p H为4的弱酸性KHSO4溶液、p H为10的弱碱性Na OH溶液、加入不同浓度KHSO4的3.5%Na Cl溶液、加入不同浓度Na OH的3.5%Na Cl溶液。研究结果表明:在模拟海水、p H为4的弱酸性KHSO4溶液中,氯离子和硫酸根离子为破坏性离子,会加速高锰钢的腐蚀。在p H为10的弱碱性Na OH溶液中,OH-能促进高锰钢表面耐腐蚀产物的形成,从而抑制高锰钢的腐蚀。三种高锰钢试样在加入不同浓度KHSO4的3.5%Na Cl溶液中,硫酸氢根离子与氯离子在高锰钢表面会发生竞争吸附,当硫酸氢根离子浓度很低时,硫酸氢根离子会对腐蚀起到一定的抑制作用,随着硫酸氢根离子浓度的增大,吸附在高锰钢表面的硫酸氢根离子数目增多,从而加速高锰钢的腐蚀,使高锰钢的耐蚀性下降。三种高锰钢试样在加入不同浓度Na OH的3.5%Na Cl溶液中,随着加入的Na OH溶液浓度的增大,高锰钢的耐蚀性逐渐提高,证明OH-可以抑制Cl-对高锰钢的腐蚀。纳米晶高锰钢在含Cl-和OH-腐蚀介质中的耐蚀性明显优于原态高锰钢和变形高锰钢,表明具有纳米晶组织的钢铁材料具有优异抗腐蚀能力。
[Abstract]:In this paper, the microstructure of high manganese steel, deformed high manganese steel and nanocrystalline high manganese steel were measured by metallography and TEM, and polarization curves were used. Electrochemical impedance spectroscopy (EIS) was used to study the corrosion behavior of high manganese steel in different corrosion medium. The surface morphology of the samples after corrosion was observed by scanning electron microscope. The corrosion media were as follows: weak acidic KHSO4 solution with simulated seawater pH = 4, weak alkaline NaOH solution with pH = 10 and 3.5% NaCl solution with different concentrations of KHSO4. The results show that chloride and sulfate ions are destructive ions in weak acid KHSO4 solution with simulated seawater pH = 4. It can accelerate the corrosion of high manganese steel. In weak alkaline NaOH solution with pH = 10, OH- can promote the formation of corrosion resistant products on the surface of high manganese steel and thus inhibit the corrosion of high manganese steel. Three kinds of high manganese steel samples are added in 3.5% NaCl solution with different concentrations of KHSO4. When the concentration of hydrogen sulfate ion is very low, the hydrogen sulfate ion will inhibit the corrosion to some extent, and with the increase of hydrogen sulfate ion concentration, the adsorption of hydrogen sulfate ion and chloride ion on the surface of high manganese steel will be competitive, and when the concentration of hydrogen sulfate ion is very low, hydrogen sulfate ion will play a certain role in inhibiting the corrosion. The number of hydrogen sulfate ions adsorbed on the surface of high manganese steel increased, which accelerated the corrosion of high manganese steel and decreased the corrosion resistance of high manganese steel. With the increase of the concentration of NaOH solution, the corrosion resistance of high manganese steel increases gradually. It is proved that OH- can inhibit the corrosion of high manganese steel by Cl-, and the corrosion resistance of nanocrystalline high manganese steel in Cl- and OH- corrosion medium is obviously better than that of original high manganese steel and deformed high manganese steel, which indicates that the steel material with nanocrystalline structure has excellent corrosion resistance.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG142.1

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