许淳淳
,
吴小梅
中国腐蚀与防护学报
通过测量AISI304不锈钢/05 mol/LNaCl体系在添加不同种 类、不同浓度的所选阴离子(MoO2-4、WO2-4、C12H25SO -4和C12H25C6H4SO-3)溶液中(pH=7,T=50℃)的动电位扫描极化 曲线 ,揭示了这几种阴离子对304不锈钢在含Cl-体系中对孔蚀诱发及扩展的抑制作用和缓蚀效 果.结果表明:几种阴离子对不锈钢孔蚀均有一定的抑制作用,抑制效果由大到小的顺序为 :WO2-4>MoO2-4>C12H25SO-4>C12H25C 6H4SO-3.
关键词:
不锈钢
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localized corrosion
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anions
J.Q. Zhang
金属学报(英文版)
Spontaneous electrochemical noise (EN) can be a rich source of information concerning the processes simultaneously occurring on a corroding interface. But the noise signal is often difficult to be analyzed due to the complicated nature of the specific systems being investigated. In this paper, the potential noise fluctuations during the free corrosion of commercial aluminum alloy LY12 in sodium chloride solution was recorded and analyzed with different techniques. The typical results showed that the fractal dimension (D,n) obtained from spectral power density (SPD) is mainly directly proportional to the intensity of pitting corrosion and to the value of pitting parameter (SE) derived from dimensional analysis, while the fractal dimension (DE) obtained from EIS is mainly related to the uniform corrosion.
关键词:
electrochemical noise
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null
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null
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null
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null
罗建成
,
莫烨强
,
郑丽群
,
刘志平
,
孙亮
,
侯艳宏
腐蚀与防护
为探讨局部腐蚀对探针读数的影响,采用扫描电镜、金相显微镜、能谱等表征方法对20号碳钢探针的失效进行了研究。宏观和微观形貌表明,探针表面随机分布着大小不均的腐蚀坑;金相结果表明,探针材质合格,晶体组织均匀;能谱分析表明,腐蚀坑内存在氯离子和硫元素的局部聚集现象。不均匀的覆盖物在探针表面的形成,以及在电位差及腐蚀介质的影响下,探针表面发生了局部电化学腐蚀,较多腐蚀坑的出现引起了感应电阻信号的跳动,产生了数据的失真。
关键词:
电感探针
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20号钢
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失效分析
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局部腐蚀