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中国腐蚀与防护学报  1989, Vol. 9 Issue (1): 59-62    
  研究报告 本期目录 | 过刊浏览 |
锰铜合金腐蚀裂缝在3.5%NaCl中的电化学行为
黄永昌;王自聪
上海交通大学;上海交通大学
INVESTIGATION OF CHEMICAL AND ELECTROCHEMICAL CHANGES WITHIN CORROSION CRACKS OF Mn—Cu ALLOY
Huang Yongchang and Wang Zicong (Shanghai Jiao Tong University)
全文: PDF(320 KB)  
摘要: <正> 锰铜系高阻尼合金在铸态下具有优良的机械性能与阻尼性能,是一种新的舰艇螺旋浆材料。该合金的主要成份是:35~36%Cu,4~4.5%Al,2.5~3.5%Fe,1~2%Ni,余量 Mn,实艇试验表明,采用这种合金对降低螺旋浆的振动和噪声有明显的效果。但是,锰铜合金在海水介质中有 SCC 敏感性。实验室试验得出,该合金在3.5%NaCl 中的 K_(?)cc 约等于26kgf/mm~3 /2。现场试验也发现,经焊补的锰铜合金螺旋浆很快在焊缝周围出现开裂。本工作沿用前人的方法,采用闭塞电池模拟腐蚀裂缝,初步探讨了锰铜合金在海水介质中发生 SCC 的原因及可能防止的方法。
Abstract:Mn-Cu alloy is susceptible to SCC in sea water.A simulated occluded corrosion cell was used to study the chemical and electrochemical changes within corrosion cracks of Mn-Cu alloy in 3.5% NaCl solution.Under nature corrosion condition the potential within corrosion cracks always maintained 30-60mV more negative than the bulk potential.As anodic current (i_a=3.5mA/cm~2)passed through the occluded cell,the pH of solution decreased rapidly from 7to 3.5,and the Cl~=concentration increased 1.6 times.A linear relationship existed between Cl~= migration into occluded cell and time.When the bulk specimen was cathodically polarized at potential -0.85~0.95 V(vs.SCE),the potential within corrosion cracks is approximatelly equal to the bulk potential,and the pH in the occluded cell increased from 7to 8-9.Therefore SCC of Mn-Cu alloy can be prevented by cathodic protection.Control of the bulk potential range (-0.90~-0.95 V,vs.SCE)could prevent the initiation and propagation of cracks,
收稿日期: 1989-02-25     

引用本文:

黄永昌;王自聪. 锰铜合金腐蚀裂缝在3.5%NaCl中的电化学行为[J]. 中国腐蚀与防护学报, 1989, 9(1): 59-62.
. INVESTIGATION OF CHEMICAL AND ELECTROCHEMICAL CHANGES WITHIN CORROSION CRACKS OF Mn—Cu ALLOY. J Chin Soc Corr Pro, 1989, 9(1): 59-62.

链接本文:

https://www.jcscp.org/CN/      或      https://www.jcscp.org/CN/Y1989/V9/I1/59

[1] MC-77高阻尼合金螺旋浆电化学保护及应力腐蚀的试验研究(内部资料)
[2] MC-77高阻尼合金材料的研究(内部资料)
[3] 左景伊、金志强 化工学报(4) ,291(1982)
[4] 左景伊、金志强 北京化工学院学报(2) ,33(1985)
[5] Brown,B.F.,CEBELCOR,Bulletin E,76(8) ,1(1969)
[6] Pourbaix.M.The Theory of SCC in Alloys,Scully,J.C.,Ed,39(1971)
[7] Wilde,B.E.,& Williams,E.,Electrochemical Acta,16,1971(1971)
[8] Parkins,R.N.,Materials Performance,(8) ,9(1985)
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