摘要
采用单质硫悬浮实验法,利用失重法、扫描电子显微镜(SEM)、X射线能谱(EDS)、X射线衍射(XRD)和pH计等分析手段,研究了单质硫沉积对国产超级13Cr马氏体不锈钢在模拟高温高压环境中腐蚀行为的影响,分析了腐蚀产物的表面形貌、元素组成及其含量、组分以及单质硫对高浓度NaCl溶液酸化程度的影响。结果表明:国产超级13Cr马氏体不锈钢的耐蚀性能因单质硫的添加而降低,其均匀腐蚀速率随着单质硫含量的增大而增大,并且在90℃取得最大值,但均小于0.0125mm/a;单质硫的添加改变了腐蚀产物膜的组分,硫化物的含量随单质硫含量的增大而增大;单质硫/金属界面处的pH值因单质硫与水发生歧化反应而降低,进而降低了超级13Cr马氏体不锈钢的耐蚀性能,Cl-与单质硫协同作用进一步加剧其腐蚀。
Corrosion behavior of the domestic super 13 Cr martensitic stainless steel（00Cr13Ni5Mo2）was investigated by elemental sulfur suspension experimental method in the simulated high temperature and high pressure environment.Corrosion rate was calculated utilizing mass loss method.The micro-morphologies and chemical compositions of corrosion scales were characterized using scanning electron microscope（SEM）,energy dispersive spectrometer（EDS）and X-ray diffraction（XRD）,and effects of elemental sulfur on the acidification degree of NaCl solution were measured using pH meter.The results show that corrosion resistance of super 13 Cr martensitic stainless steel decreases due to the presence of elemental sulfur.Average corrosion rate increases with the increase of sulfur content,and the maximum corrosion rate is present at 90℃,while all of them are less than 0.0125mm/a;the compositions of corrosion scales change from oxides to sulfides,and the percentage of sulfides increases with the increase of elemental sulfur content;pH value on sulfur/metal interface decreases due to the disproportionation reaction between elemental sulfur and water,which decreases corrosion resistance of super 13 Cr martensitic stainless steel.The synergistic effect between Cl-and elemental sulfur leads to more serious corrosion.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2016年第3期84-91,共8页
Journal of Materials Engineering
基金
国家自然科学基金项目(21376189)
陕西省自然科学基础研究计划项目(2014JQ6219)
陕西省教育厅重点实验室科研计划项目(14JS086)
西安市科技计划项目(CXY1515(3))
关键词
单质硫
超级13Cr马氏体不锈钢
歧化反应
协同作用
elemental sulfur
super 13Cr martensitic stainless steel
disproportionation reaction
synergistic effect
