摘要
在S^(2-)浓度为6 g/L的氢氧化钠溶液介质中,采用盐雾腐蚀和电化学腐蚀方法,借助腐蚀失重、SEM及EDS等分析手段,研究腐蚀时间对Q235钢腐蚀行为的影响。结果表明,腐蚀首先发生在试样表面的划痕处,腐蚀程度随时间延长而加重,腐蚀失重和腐蚀电流密度分别从1天的3.846 2 g/m^2、2.431μA/cm^2增加到9天的4.049 5g/m^2、3.361μA/cm^2。腐蚀产物主要为Fe、O、S等元素,腐蚀初期,基体表面以OH-的竞争吸附占主导,主要发生Fe的氧化反应;腐蚀后期,S^(2-)的吸附逐渐占据主导,同时发生Fe的氧化与硫化反应,产物中S的含量持续增加。
Experiments were carried out in the sodium hydroxide solution with 6g/L S^2- concentration through the salt spray corrosion and electrochemical corrosion method, by means of corrosion weight loss, SEM and EDS and other analytical methods. The influence of corrosion time on the corrosion behavior of Q235 steel was researched. Results showed that corrosion occurred firstly at the scratch marks on the surface of the specimen, the degree of corrosion was serious with time prolonged. Corrosion weight loss and corrosion current density respectively increased from 3. 846 2 g/m^2 ,2. 431 μA/cm^2 of the first day to 4. 049 5 g/m^2 ,3. 361 μA/cm^2 of the ninth day. The corrosion products are mainly composed of Fe,O,S and other elements. In the early stages of corrosion, the competitive adsorption of OH - on the substrate surface was dominant, it mainly occurred oxidation reaction of iron; in the later stages of corrosion, the adsorption of S^2- was dominant, it synchronously oc- curred oxidation reaction and curing reaction of iron, the content of sulfur in the products increased continuously.
出处
《现代机械》
2017年第2期80-83,共4页
Modern Machinery
基金
国家自然科学基金(51574095
51474079)
贵大SRT字(2015)147号
贵州省校合作项目(LH[2014]7609)
黔教合KY字(2015)334
LH字[2015]7652
黔科合人才团队(2015)4005
关键词
硫化钠
Q235钢
氢氧化钠溶液
盐雾腐蚀
电化学腐蚀
sodium sulfide, Q235 steel, sodium hydroxide solution, salt spray corrosion, electrochemical corrosion
