电化学诱导退火(EIA)是一种通过对不锈钢进行正负交变电脉冲处理提高不锈钢的耐蚀性的方法,但是其所用介质弧硝酸钠是一种强的致癌物质,且单一的处理介质限制了该方法的工业应用。本工作在不同介质中对不锈钢进行了正负交变电脉冲处理,通过XRD测试、金相观察、循环伏安测试、极化曲线测试等方法研究处理前后的组织变化、耐腐蚀性变化及其机理。结果表明,EIA相变可以在亚硝酸钠以外的介质,如碳酸钠溶液中实现,氮不是发生EIA相变的必要条件;适当延长电脉冲处理的阴极部分时间能够提高1mol/L碳酸钠溶液中的EIA处理效率。碳酸钠中的EIA相变也可以降低不锈钢在NaCl水溶液中的点蚀敏感性;在亚硫酸钠、硅酸钠和乙酸钠溶液中的电脉冲处理易导致马氏体被优先腐蚀。
Electrochemically induced annealing (EIA) is a method to improve the corrosion resistance of stainless steel with a series of anodic/cathodic electrical pulses. However, the treatment solution of sodium nitrite is a kind of carcinogen, and the only medium confines the industrial application of the treatment. Stainless steel samples were treated in several solutions with a series of anodic/cathodic electrical pulses in the present work. The changes of the corrosion resistance and surface microscopic structure of the steel after the treatment and the mechanisms were studied with XRD, metallographic observation, cyclic voltammetry test and potentio dynamic scanning. Results showed that EIA phase transformation could occur in mediums other than sodium nitrite, such as sodium carbonate. Nitrogen is not an essential condition for the EIA phase transformation. Efficiency of the treatment in 1 mol/L sodium carbonate solution could be improved by reasonable prolonging the cathodic intervals of the electrical pulses. Pitting sensitivity of the sled in sodium chloride solution could also be reduced with the EIA treatment in the sodium carbonate solution. However, the electric pulse treatment in solutions of sodium sulfite, sodium silicate and sodium acetate caused preferential corrosion of the martensite in the steel.
参考文献
[1] | 潘川,褚武扬,李正邦,梁东图,宿彦京,乔利杰.The role of atomic hydrogen and hydrogen-induced martensites in hydrogen embrittlement of type 304L stainless steel[J].中国科学E辑(英文版),2002(02):175-183. |
[2] | Li ZL;Shang JH;Liu W;Fei B .Electrochemically induced surface annealing without electrolyte immersion and its influence on pitting resistance[J].Surface & Coatings Technology,2008(19):4830-4833. |
[3] | 方智.形变诱发马氏体对304不锈钢在活化状态下电化学行为的影响[J].腐蚀科学与防护技术,1997(01):75. |
[4] | Pan C.;Chu WY.;Li ZB.;Liang DT.;Su YJ.;Gao KW.;Qiao LJ. .Hydrogen embrittlement induced by atomic hydrogen and hydrogen-induced martensites in type 304L stainless steel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):293-298. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%