船舶用Ti70合金在人工海水中的腐蚀行为研究
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摘要
采用全浸腐蚀和电偶腐蚀实验,研究了Ti70合金的均匀腐蚀行为,以及与945钢的电偶腐蚀行为。结果表明:Ti70合金耐蚀性能极好,在60℃人工海水浸泡30 d后试样出现了轻微增重,腐蚀速率为-5.857×10-4mm/a,达到了I级完全耐蚀级别;Ti70合金自腐蚀电位远高于945钢,两者偶联时945钢将作为阳极被加速腐蚀;随着Ti70/945钢偶对面积比增加,945钢质量损失、以及电偶腐蚀电流和电偶腐蚀系数均逐渐增加,当两者偶对面积比为1∶1时,电偶腐蚀敏感等级达到了D级,因此当Ti70合金与945钢接触使用时需对945钢进行阴极保护。
The corrosion behavior of a marine Ti70 alloy and galvanic corrosion behavior of the couple of Ti70 alloy with 945 steel were investigated in artificial sweater via immersion-and galvanic corrosion-test. Results showed that Ti70 alloy presented excellent corrosion-resistance up to grade 1. The weight of the Ti70 alloy increased slightly after immersed in the artificial seawater at 60 ℃ for 30 d and its corrosion rate was only-5.857×10-4mm/a. The free corrosion potential of 945 steel was more negative than that of Ti70 alloy and the corrosion of steel was accelerated when coupled with Ti70 alloy. The mass loss of 945 steel, corrosion current and galvanic corrosion coefficient increased with the increase of the area ratio of Ti70 alloy to 945 steel, while its sensitivity of galvanic corrosion reached D-level when the area ratio was 1∶1. Therefore, properly cathodic protection was necessary for 945 steel when coupled with Ti70 alloy.
The corrosion behavior of a marine Ti70 alloy and galvanic corrosion behavior of the couple of Ti70 alloy with 945 steel were investigated in artificial sweater via immersion-and galvanic corrosion-test. Results showed that Ti70 alloy presented excellent corrosion-resistance up to grade 1. The weight of the Ti70 alloy increased slightly after immersed in the artificial seawater at 60 ℃ for 30 d and its corrosion rate was only-5.857×10-4mm/a. The free corrosion potential of 945 steel was more negative than that of Ti70 alloy and the corrosion of steel was accelerated when coupled with Ti70 alloy. The mass loss of 945 steel, corrosion current and galvanic corrosion coefficient increased with the increase of the area ratio of Ti70 alloy to 945 steel, while its sensitivity of galvanic corrosion reached D-level when the area ratio was 1∶1. Therefore, properly cathodic protection was necessary for 945 steel when coupled with Ti70 alloy.
引文
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[16] Chen X S, Xu Y F, Yan K P. Study on galvanic corrosion occurred in titanium steel composite plate in seawater[J]. Process Equip.Piping, 2015, 52(5):21)(陈兴松,徐永峰,闫康平.钛钢复合板在海水中电偶腐蚀研究[J].化工设备与管道, 2015, 52(5):21)
[17] Chen X W, Wu J H, Wang J, et al. Progress in research on factors influencing galvanic corrosion behavior[J]. Corros. Sci. Prot.Technol., 2010, 22:363(陈兴伟,吴建华,王佳等.电偶腐蚀影响因素研究进展[J].腐蚀科学与防护技术, 2010, 22:363)
[2] Zhang Y, Jiang G F. Application of titanium alloys to anti-corrosion in naval vessels[J]. World Nonferrous Met., 2016,(5):14(张勇,姜国锋.钛合金在舰船防腐蚀上的应用[J].世界有色金属, 2016,(5):14)
[3] Chen J, Zhao Y Q, Chang H. Research and development of titanium alloy for shipbuilding in China[J]. Mater. Rev., 2005, 19(6):67(陈军,赵永庆,常辉.中国船用钛合金的研究和发展[J].材料导报, 2005, 19(6):67)
[4] Zhang Y F, Lin C, Du N, et al. Cavitation corrosion behavior of TC4 titanium alloy in lithium bromide solution[J]. Corros. Prot.,2015, 36:522(张翼飞,林翠,杜楠等. TC4钛合金在溴化锂水溶液中的空蚀行为[J].腐蚀与防护, 2015, 36:522)
[5] Yang F, Ju H J, Mao X N, et al. Corrosion behavior of annealed Ti35 alloy in concentrated nitric acid[J]. Rare Met. Cem. Carbides,2016, 44(1):47(杨帆,巨辉建,毛小楠等.退火态Ti35钛合金在浓硝酸中的腐蚀行为研究[J].稀有金属与硬质合金, 2016, 44(1):47)
[6] Zhang X Y, Tang Z H, Sun Z H, et al. Galvanic corrosion and pro‐tection between titanium alloy and other materials[J]. J. Mater.Eng., 2010,(11):74(张晓云,汤智慧,孙志华等.钛合金的电偶腐蚀与防护[J].材料工程, 2010,(11):74)
[7] Si W H. An investigation on of galvanic corrosion between exhaust system of titanium alloy and hull steel[J]. Dev. Appl. Mater., 2013,28(2):34(司卫华.钛合金与钢的电偶腐蚀行为研究[J].材料开发与应用,2013, 28(2):34)
[8] Zhao M Q, Lei A L. Corrosion and Protection of Metals[M]. Bei‐jing:National Defence Industry Press, 2002(赵麦群,雷阿丽.金属的腐蚀与防护[M].北京:国防工业出版社, 2002)
[9] Brossia C S, Cragnolino G A. Effect of palladium on the corrosion behavior of titanium[J]. Corros. Sci., 2004, 46:1693
[10] Yang D, Guo J M. Corrosion mechanism of titanium alloys and de‐velopment of corrosion-resistance titanium alloys[J]. Titanium Ind. Prog., 2011, 28(2):4(杨东,郭金明.钛合金的腐蚀机理及耐蚀钛合金的发展现状[J].钛工业进展, 2011, 28(2):4)
[11] Contu F, Elsener B, B?hni H. Serum effect on the electrochemical behaviour of titanium, Ti6Al4V and Ti6Al7Nb alloys in sulphuric acid and sodium hydroxide[J]. Corros. Sci., 2004, 46:2241
[12] He Y F, Lu W Z, Gan W M. Electrochemical corrosion behaviors of titanium alloy in different solutions[J]. J. South China Univ.Technol.(Nat. Sci. Ed.), 2017, 45(6):124(何亚峰,卢文壮,干为民.钛合金在不同溶液中的电化学腐蚀行为[J].华南理工大学学报(自然科学版), 2017, 45(6):124)
[13] Garfias-Mesias L F, Alodan M, James P I, et al. Determination of precursor sites for pitting corrosion of polycrystalline titanium by using different techniques[J]. J. Electrochem. Soc., 1998, 145:2005
[14] Zhang R, Zhang H X, Jia R L, et al. The corrosion resistance of ti‐tanium and its alloy[J]. Dev. Appl. Mater., 2013, 28(4):96(张睿,张慧霞,贾瑞灵等.钛及其合金的腐蚀[J].材料开发与应用, 2013, 28(4):96)
[15] El-Sharkawi M A, Upadhye A, Lu S, et al. North east pacific timeintegrated undersea networked experiments(NEPTUNE):Cable switching and protection[J]. IEEE J. Oceanic Eng., 2005, 30:232
[16] Chen X S, Xu Y F, Yan K P. Study on galvanic corrosion occurred in titanium steel composite plate in seawater[J]. Process Equip.Piping, 2015, 52(5):21)(陈兴松,徐永峰,闫康平.钛钢复合板在海水中电偶腐蚀研究[J].化工设备与管道, 2015, 52(5):21)
[17] Chen X W, Wu J H, Wang J, et al. Progress in research on factors influencing galvanic corrosion behavior[J]. Corros. Sci. Prot.Technol., 2010, 22:363(陈兴伟,吴建华,王佳等.电偶腐蚀影响因素研究进展[J].腐蚀科学与防护技术, 2010, 22:363)
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