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Galvanic Interactions of Aluminium 3004 and ∝ Brass in Tropical marine Atmosphere

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Journal of marine Science and Application 2014年第4期13卷 455-461页

作者： S. Palraj G. Subramanian S. Palanichamy csir-Central Electrochemical Research Institute Karaikudi-630006 India offshore platform & marine Electrochemistry centre CSIR-CECRI Unit Harbour Area Tuticorin-628004 India

铝 3004 的流电的腐蚀行为 - 有不同区域比率的黄铜在 426 天的一个时期上在 Tuticorin 港口在热带海洋的空气被学习。区域比率， viz。一铝 :A 学习的黄铜 , 是 0.125， 0.25， 0.5， 1， 2， 4 和 8。金属的流电的腐蚀行为由于流... 详细信息

铝 3004 的流电的腐蚀行为 - 有不同区域比率的黄铜在 426 天的一个时期上在 Tuticorin 港口在热带海洋的空气被学习。区域比率， viz。一铝 :A 学习的黄铜 , 是 0.125， 0.25， 0.5， 1， 2， 4 和 8。金属的流电的腐蚀行为由于流电的结合以铝的腐蚀率的相对增加被学习黄铜，处于黄铜的腐蚀率的相对减少由于流电的结合铝，并且到由于流电的结合的 pitting 的铝的危险性黄铜。系统的流电的潜在、流电的水流被监视。从温和蚀刻到穿孔的不同尺寸的坑在与黄铜的接触在边阶和铝的接口的表面上经验丰富。源于流电的腐蚀的腐蚀产品用 XRD 被分析，由于流电的腐蚀的铝上的 pitting 以坑的坑深度，尺寸和密度被加亮，用一台高分辨率显微镜。在海洋的空气的铝黄铜的最赞成的区域比率以 gravimetric 腐蚀率是 8:1，铝黄铜的最不利的区域比率是 1:4。

关键词：海洋大气黄铜相互作用热带铝电偶腐蚀腐蚀行为腐蚀速率

Galvanic Corrosion Behaviour of HE 20 / MDN 138 ＆ HE 20 /MDN 250 Alloys in Natural Seawater

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Journal of marine Science and Application 2016年第3期15卷 343-348页

作者： G. Subramanian G. T. Parthiban K. Muthuraman P. Ramakrishna rao offshore platform & marine Electrochemistry centre CSIR-CECRI Unit Harbour Area Tuticorin - 628004 India csir-Central Electrochemical Research Institute Karaikudi- 630003 India Defence Research Development Laboratory Hyderabad India

In view of their excellent mechanical properties, workability and heat treatment characteristics, MDN 138 & MDN 250 have been widely used in missile, rocket and aerospace industries. With light weight and high performance characteristics HE 20 aluminium alloy acts as an important material in defence and aerospace applications. The galvanic corrosion behaviour of the metal combinations HE 20 / MDN 138 and HE 20 / MDN 250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of cecri's offshore platform at Tuticorin for a year. The open circuit potentials of MDN 138, MDN 250 and HE 20 of the individual metal, the mixed potential and galvanic current of the couples HE 20 / MDN 138 and HE 20 / MDN 250 were periodically monitored throughout the study period. The calcareous deposits on MDN 138 and MDN 250 were analysed using XRD. The results of the study reveal that that HE 20 has offered required amount of protection to MDN 138 & MDN 250.

关键词： MDN 138 MDN 250 HE 20 galvanic corrosion natural seawater aluminium alloy

Galvanic Interactions of HE15 / MDN138 & HE15 / MDN250 Alloys in Natural Seawater

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Journal of marine Science and Application 2017年第2期16卷 237-242页

作者： G. T. Parthiban G. Subramanian K. Muthuraman P. Ramakrishna Rao csir-Central Electrochemical Research Institute Karaikudi-630003 India offshore platform & marine Electrochemistry centre CSIR-CECRI Unit Harbour Area Tuticorin-628004 India Defence Research Development Laboratory Hyderabad-500058 India

HE15 is a heat treatable high strength alloy with excellent machinability find wide applications in aerospace and defence industries. In view of their excellent mechanical properties, workability, machinability, heat treatment characteristics and good resistance to general and stress corrosion cracking, MDN138 & MDN250 have been widely used in petrochemical, nuclear and aerospace industries. The galvanic corrosion behaviour of the metal combinations HE15 / MDN138 and HE15 / MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of cecri's offshore platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250 and HE15 of the individual metal, the galvanic potential and galvanic current of the couples HE15 / MDN138 and HE15 / MDN250 were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with HE15 were analyzed using XRD. The electrochemical behaviors of MDN138, MDN250 and HE15 in seawater have been studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with HE15 have been examined with scanning electron microscope. The results of the study reveal that HE15 offered required amount of protection to MDN138 & MDN250.

关键词： alloy MDN138 MDN250 HE15 galvanic corrosion natural seawater

Hard Foulers Induced Crevice Corrosion of HSLA Steel in the Coastal Waters of the Gulf of Mannar (Bay of Bengal), India

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Journal of marine Science and Application 2014年第1期13卷 117-126页

作者： S.Palanichamy G.Subramanian offshore platform and marine Electrochemistry centre CSIR Central Electrochemical Research InstituteNew Harbour Area Tuticorin 628004 India

In the present study an attempt has been made to investigate the relationship between the variations in the fouling assemblage and corrosion behaviour of HSLA steel at three coastal locations in the Gulf of Mannar, India, over a period of 24 months. Oyster fouling was dominant in the Tuticorin open sea, while barnacles were the major foulants in the Tuticorin harbour and Mandapam. The fouling load in the Tuticorin waters was higher when compared to the Mandapam waters. The corrosion rates decreased progressively with the immersion time at all three test locations. In the Tuticorin open sea, the corrosion rates were higher when compared to the other two locations throughout the study period. The surface of the coupons was characterized by crevices beneath the hard foulers in the Tuticorin harbour and Mandapam, whereas in the Tuticorin open sea, the coupons experienced crevices of a tunneling nature. The percentage of the loss of the tensile strength increased with time at all the test locations.

关键词： HSLA steel coastal waters weight loss crevicecorrosion fouling ultimate tensile strength

污垢组合对印度玛纳尔湾水域低碳钢腐蚀行为的影响研究(英文)

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Journal of marine Science and Application 2013年第4期12卷 500-509页

作者： G.Subramanian S.Palanichamy offshore platform and marine Electrochemistry centre CSIR-Central Electrochemical Research Institute

Corrosion behaviour and biofouling characteristics of mild steel in three different coastal locations in the Gulf of Mannar,India have been studied over a period of 24 *** fouling was predominant at Open sea-Tuticorin,while barnacle fouling was dominant at both Mandapam and *** rate of corrosion for 24 months exposure period was highest at Mandapam,where fouling was *** surface of the mild steel was characterized by etchings&crevices beneath the hard foulers attached on it,at all the test *** depth of crevice caused by hard foulers was higher at Open sea-Tuticorin followed by harbour-Tuticorin and *** loss in ultimate tensile strength was more in Open sea-Tuticorin than the other two *** behaviour of mild steel is discussed based on the variation in the biofouling assemblage at the three test locations.

关键词： mild steel coastal waters crevice corrosion biofouling ultimate tensile strength fouling assemblage corrosion behaviour