模拟酸性海盐气溶胶环境下高强钢的腐蚀行为
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摘要
海盐气溶胶是高强钢在海洋大气环境中失效的主要因素,而目前对于海盐气溶胶的腐蚀研究较少。通过超声雾化模拟高浓度酸性海盐气溶胶环境,采用金相显微镜、电阻探针、扫描电镜(SEM)、腐蚀失重、电化学阻抗谱(EIS)、能谱仪(EDS)等方法研究了Q460B和Q420C 2种高强钢在该环境中的腐蚀行为。结果表明:2种材料的腐蚀速率先加快后减慢最后趋于稳定,Q460B钢的腐蚀产物对钢体保护作用强,钢材耐腐蚀性能更优;模拟液中加淀粉减小了超声雾化气溶胶的粒径,粒径减小使得腐蚀速率加快;海盐气溶胶中参与金属腐蚀的主要因素是Cl-和SO_4~(2-),Br~-不参与腐蚀;且雾化粒径减小能够促进Cl~-和SO_4~(2-)参与基体腐蚀。
Sea salt aerosol is the main factor for the failure of materials in the marine atmosphere,but there is less research on the corrosion of sea salt aerosols. The environment of acidic sea salt aerosols with high concentration was simulated,and methods of metallographic microscope,resistance probe,scanning electron microscope( SEM),corrosion weight loss method,electrochemical impedance spectroscopy( EIS) and energy spectrum( EDS) were used to study the corrosion behavior of Q460 B and Q420 C steel in this environment. Results showed that the corrosion rates of both materials increased first and then slowed down,finally tended to stabilize over time. The corrosion products of Q460 B had stronger protective effect on steel substrate,and thus Q460 B steel had better corrosion resistance. The addition of starch to the simulated liquid reduced the size of the aerosol,and the decrease of the size of aerosol particles accelerated the corrosion rate. Furthermore,the main factors involved in metal corrosion were Cl-and SO2-4 in sea salt aerosols,while Br-did not contribute to corrosion. The decrease of atomized particle size could promote Cl-and SO2-4 to participate in matrix corrosion more effectively.
Sea salt aerosol is the main factor for the failure of materials in the marine atmosphere,but there is less research on the corrosion of sea salt aerosols. The environment of acidic sea salt aerosols with high concentration was simulated,and methods of metallographic microscope,resistance probe,scanning electron microscope( SEM),corrosion weight loss method,electrochemical impedance spectroscopy( EIS) and energy spectrum( EDS) were used to study the corrosion behavior of Q460 B and Q420 C steel in this environment. Results showed that the corrosion rates of both materials increased first and then slowed down,finally tended to stabilize over time. The corrosion products of Q460 B had stronger protective effect on steel substrate,and thus Q460 B steel had better corrosion resistance. The addition of starch to the simulated liquid reduced the size of the aerosol,and the decrease of the size of aerosol particles accelerated the corrosion rate. Furthermore,the main factors involved in metal corrosion were Cl-and SO2-4 in sea salt aerosols,while Br-did not contribute to corrosion. The decrease of atomized particle size could promote Cl-and SO2-4 to participate in matrix corrosion more effectively.
引文
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[16]施刚,石永久,王元清.超高强度钢材钢结构的工程应用[J].建筑钢结构进展,2008,10(4):32-38.
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[19]谭何灵,周成,刘希辉,等. Cr对Q420钢在高盐度大气环境下耐蚀性的影响[J].中国腐蚀与防护学报,2017,37(3):267-272.
[2]郑秀洁,张科萍,吕本松,等.人工海水盐的研究进展[J].盐业与化工,2013,42(6):31-32.
[3]王彬彬,王振尧,曹公望,等.受力的LY12和LC4铝合金在中国西部盐湖大气环境中的腐蚀行为[J].中国腐蚀与防护学报,2014(3):287-293.
[4]王振尧,于全成,陈军君,等.周期干湿浸条件下P265GH钢和Q235钢的大气腐蚀行为[J].中国腐蚀与防护学报,2014,34(1):53-58.
[5]王振尧,于国才,韩薇.碳钢和低合金钢在污染环境中的大气腐蚀规律[J].钢铁研究学报,2003,15(3):47-51.
[6]王彬彬,王振尧,曹公望,等. 2024铝合金在中国西部盐湖大气环境中的局部腐蚀行为[J].金属学报,2014,50(1):49-56.
[7] CORVO F,PEREZ T,DZIB L R,et al. Outdoor-indoor corrosion of metals in tropical coastal atmospheres[J]. Corrosion Science,2008,50(1):220-230.
[8] AZMAT N S,RALSTON K D,MUDDLE B C,et al. Corrosion of Zn under acidified marine droplets[J]. Corrosion Science,2011,53(4):1 604-1 615.
[9] AZMAT N S,RALSTON K D,MUDDLE B C,et al. Corrosion of Zn under fine size aerosols and droplets using ink jet printer deposition and optical profilometry quantification[J].Corrosion Science,2011,53(11):34-35.
[10] MA Y T,LI Y,WANG F H. The atmospheric corrosion kinetics of low carbon steel in a tropical marine environment[J].Corrosion Science,2010,52(5):1 796-1 800.
[11] COLE I S,LAU D,PATERSON D A. Holistic model for atmospheric corrosion Part 6——From wet aerosol to salt deposit[J]. British Corrosion Journal,2013,39(3):209-218.
[12] VELEVA L,FARRO W. Influence of seawater and its aerosols on copper patina composition[J]. Applied Surface Science,2012,258(24):10 072-10 076.
[13]万晔,严川伟.硫酸铵颗粒沉积作用下A3钢的大气腐蚀行为[J].物理化学学报,2002,18(2):156-160.
[14] LI S,HIHARA L H. Aerosol salt particle deposition on metals exposed to marine environments:a study related to marine atmospheric corrosion[J]. Journal of the Electrochemical Society,2014,161(161):C268-C275.
[15]刘圆圆,王燕华,钟莲,等.液滴下金属海洋大气腐蚀的研究[J].腐蚀科学与防护技术,2012,24(1):74-76.
[16]施刚,石永久,王元清.超高强度钢材钢结构的工程应用[J].建筑钢结构进展,2008,10(4):32-38.
[17]秦永坚,王登科,唐其练,等. 500kV双回路输电线路铁塔采用Q420高强钢的研究[J].武汉大学学报(工学版),2007(增刊1):60-65.
[18]李正良,刘红军,张东英,等. Q460高强钢在1000 k V杆塔的应用[J].电网技术,2008,32(24):1-5.
[19]谭何灵,周成,刘希辉,等. Cr对Q420钢在高盐度大气环境下耐蚀性的影响[J].中国腐蚀与防护学报,2017,37(3):267-272.