摘要
为了研究SO_(4)^(2-)对含有0.7 mol/L Cl^(-)溶液中304不锈钢腐蚀损伤的影响,采用声发射技术与形貌观察技术分别测试试样腐蚀过程中产生的声信号和腐蚀前后试样表面形貌。结果表明:在Cl^(-)/SO_(4)^(2-)溶液中,随着SO_(4)^(2-)浓度的增加,304不锈钢腐蚀过程产生的AE信号相对能量与幅度较大值、撞击累积数曲线斜率、持续时间等参数先减小后增加;腐蚀坑与龟裂块状的腐蚀产物数量先减少后增加,由龟裂腐蚀产物引起的表面疏松程度先紧密后疏松。试样腐蚀损伤发生的时间因SO_(4)^(2-)离子浓度不同,0、0.10、0.25和0.40 mol/L时试样损伤发生的时间段分别为腐蚀的前中期、前期、后期以及全程时间段。腐蚀损伤程度由强到弱的顺序为0 mol/L>0.40 mol/L>0.10 mol/L>0.25mol/L。综合试样腐蚀形貌与声发射参数,在本试验范围内,对于含0.7 mol/L Cl^(-)溶液中,为了减轻304不锈钢腐蚀发生,添加SO_(4)^(2-)离子的适宜浓度为0.25 mol/L。
In order to investigate the effect of SO_(4)^(2-)on the corrosion damage of 304 stainless steel in a solution containing 0.7 mol/L Cl^(-),acoustic emission technology and morphology observation technology were used to test the acoustic signal generated during the corrosion process and the surface morphology of the sample before and after corrosion,respectively.In the Cl^(-)/SO_(4)^(2-)solution,with the increase of SO_(4)^(2-)concentration,the parameters such as relative energy and amplitude of AE signal generated during the corrosion process,the slope of cumulative number of impacts and duration time,as well as the number of corrosion pits and the number of cracked massive corrosion products firstly decrease and then increase.The degree of surface looseness caused by cracked corrosion products is firstly tight and then loose with the increase of SO_(4)^(2-)concentration.The time period of sample corrosion damage is different due to the concentration of SO_(4)^(2-)ions.The time periods for sample damage at 0,0.10,0.25,and 0.40 mol/L concentrations are the early and mid-term,early,late and full time periods of corrosion,respectively.The order of SO_(4)^(2-)ion concentration influencing the degree of corrosion damage from heavy to light is 0 mol/L>0.40 mol/L>0.10 mol/L>0.25 mol/L.In this study,after evaluating sample corrosion morphology and acoustic emission parameters,appropriate concentration of SO_(4)^(2-)ions of 0.25mol/L can effectively reduce the corrosion of 304 stainless steel in a 0.7 mol/L Cl-solution.
作者
苏建文
董小平
高腾远
张昭卿
孙振铎
苏丹丹
Su Jianwen;Dong Xiaoping;Gao Tengyuan;Zhang Zhaoqing;Sun Zhenduo;Su Dandan(Department of Mechanical Design,Manufacturing and Automation,Hebei University,Baoding 071002,Hebei,China;Baoding New Energy Vehicle Power Engineering Technology Research Center,Hebei University,Baoding 071002,Hebei,China;Hebei Technology Innovation Center for Lightweight of New Energy Vehicle Power System,Hebei University,Baoding 071002,Hebei,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第1期165-173,共9页
Iron Steel Vanadium Titanium
基金
河北省自然科学基金(E2018201235)资助项目
河北省高等学校科学技术研究项目(QN2019209)
保定市科技计划项目(2074P019)。
