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首页> 外文会议>AIST steel properties amp; applications conference proceedings combined with MSamp;T' 10 materials science and technology 2010 >Pitting Corrosion Resistance of Type 2507 Duplex Stainless Steel in Synthetic Seawater and Hydraulic Fluids
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Pitting Corrosion Resistance of Type 2507 Duplex Stainless Steel in Synthetic Seawater and Hydraulic Fluids

机译：2507型双相不锈钢在合成海水和液压油中的抗点蚀性

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摘要

Type 2507 duplex stainless steel has been widely used as umbilical material in offshore oil and gas production due to its excellent corrosion resistance and high fatigue property. However, high-temperature service environments can degrade its localized corrosion resistance, leading to the premature failure of umbilical tubes. In this paper, pitting corrosion resistance of non-welded and welded 2507 duplex tubes in synthetic seawater and two hydraulic fluids was investigated using electrochemical methods, including potentiostatic polarization and cyclic potentiodynamic polarization. The potentiostatic polarization tests showed that the critical pitting temperature (CPT) values for the non-welded and welded 2507 duplex tubes in synthetic seawater were 86℃ and 53℃, respectively. The 2507 duplex tubes exhibited CPT values greater than 60℃ in the hydraulic fluids, with lower CPT values for hydraulic fluid containing low ethylene glycol. The cyclic potentiodynamic polarization tests showed that the difference between repassivation potential and corrosion potential for the welded 2507 duplex tubes in aerated synthetic seawater was greater than 256 mV at temperatures above the CPT.
机译：2507型双相不锈钢具有出色的耐腐蚀性和高疲劳性能，因此已广泛用作海上油气生产中的脐带材料。但是，高温使用环境会降低其局部耐腐蚀性，从而导致脐带管过早失效。本文采用电化学方法，包括恒电位极化和循环恒电位极化，研究了非焊接和焊接的2507双相管在合成海水和两种液压油中的耐点蚀性。恒电位极化测试表明，在合成海水中，非焊接和焊接2507双相管的临界点蚀温度（CPT）值分别为86℃和53℃。 2507双相管在液压油中的CPT值大于60℃，对于含低乙二醇的液压油，其CPT值较低。循环电势极化测试表明，在CPT之上的温度下，充气合成海水中2507焊接双相管的再钝化电势和腐蚀电势之差大于256 mV。

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