摘要
20钢由于其适中的强度硬度,良好的塑性,韧性和可焊性,在现代工业中应用极为广泛。针对20钢在模拟酸雨中的研究较少的情况,以20钢为研究对象,借助CS系列电化学工作站,首先考察了其极化曲线特点,其次通过改变模拟酸雨pH值、阴离子和浸泡时间,考察其对电化学腐蚀参数和腐蚀速率的影响。结果表明:(1)阴极极化率大于阳极极化率,属于阴极控制过程,腐蚀速率主要受阴极过程的影响;(2)随着模拟酸雨pH值的增加,腐蚀电流密度逐渐减小,腐蚀速率呈减小的趋势,临界点pH值为3;(3)不论是哪种阴离子模拟酸雨溶液,其阴极极化率均大于阳极极化率,属于阴极控制过程,NO_(3)^(-)腐蚀速率最大,Cl^(-)腐蚀速率最小;(4)随着浸泡时间的增加,腐蚀电流密度逐渐减小,腐蚀速率呈减小的趋势,临界值为8 h。研究所得结论对20钢的腐蚀与防护具有重要意义。
20 steel is widely used in modern industry because of its moderate strength and hardness,good plasticity,toughness and weldability.In view of the fact that there are few researches on 20 steel in simulated acid rain,taking 20 steel as the research object,with the help of CS series electrochemical workstation,the characteristics of polarization curve were firstly investigated.Secondly,the effects of pH value,anion and soaking time of simulated acid rain on electrochemical corrosion parameters and corrosion rate were investigated.The results show that the cathodic polarizability is greater than the anodic polarizability,which belongs to the cathodic control process,and the corrosion rate is mainly affected by the cathodic process.With the increase of pH value of simulated acid rain,the corrosion current density gradually decreases,and the corrosion rate shows a decreasing trend,and the critical point pH value is 3.No matter which kind of anion simulated acid rain solution,the cathodic polarizability is greater than the anodic polarizability,the corrosion rate of NO_(3)^(-) is the highest and that of Cl^(-) is the lowest.With the increase of immersion time,the corrosion current density gradually decreases,the corrosion rate shows a decreasing trend,and a critical value of 8 hours appears.The conclusions are of great significance to the corrosion and protection of 20 steel.
作者
王战辉
张智芳
闫君芝
常丽娜
WANG Zhanhui;ZHANG Zhifang;YAN Junzhi;CHANG Lina(School of Chemistry and Chemical Engineering,Yulin University,Yulin 719000,China;Key Laboratory of Low Metamorphic Coal Clean Utilization,Yulin 719000,China)
出处
《甘肃科学学报》
2022年第3期54-58,共5页
Journal of Gansu Sciences
基金
国家自然科学基金项目(21763030)
陕西省创新能力支撑计划(2020TD-032)
榆林市科技计划项目(2019-102-1,CXY-2020-003-01)
榆林高新区科技计划项目(CXY-2020-02)。
关键词
模拟酸雨
阴离子
浸泡时间
腐蚀速率
Simulated acid rain
Anion concentration
Soaking time
Corrosion rate
