A. Reyad, M. S. Hazarabedian, Yang Hou, E. Hornus, Mariano Iannuzzi
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引用次数: 0
摘要
可时效硬化的合金 718 可抵抗侵蚀性还原环境,并具有优异的机械性能,是石油和天然气行业中应用最广泛的镍合金。然而,它在含氧化卤环境中的局部耐腐蚀性能仍有待深入研究,文献中讨论的结果相互矛盾。在这方面,合金 718 的抗点蚀当量 (PRE) 相对较低,这限制了它在预计会发生局部腐蚀的地方的实际应用,尤其是在海水应用中。这项研究对合金在含氯环境中的局部耐腐蚀性进行了量化。采用电位动力-静电位(PD-GS-PD)技术确定了两种合金 718 牌号(即航空航天牌号(符合 ASTM B670 标准)和石油天然气牌号(符合 API 6ACRA 标准))在不同温度下脱氧天然海水中的缝隙腐蚀再钝化电位(ER,CREV)。此外,还在不同氯化物浓度的酸化溶液中对 API 6ACRA 牌号进行了电位极化测试,以模拟类似凹坑/裂缝的条件。在航空热处理条件下,合金 718 在低至 10°C 的温度下就会发生缝隙腐蚀,而 API 6ACRA 牌号在相同的测试温度下则不受影响。在 20°C 和 50°C 时,两种牌号都出现了稳定的缝隙腐蚀。
Localized Corrosion Resistance of Nickel Alloy 718 In Chloride-Containing Environments
Resistant to aggressive reducing environments and combining excellent mechanical properties, the age-hardenable Alloy 718 is the most broadly used nickel alloy in the oil and gas industry. Nevertheless, its localized corrosion resistance in oxidizing halide-containing environments has yet to be thoroughly investigated, with conflicting results discussed in the literature. In this regard, Alloy 718 has a relatively low pitting resistance equivalent (PRE), limiting in practice its use where localized corrosion is expected, particularly in seawater applications. This work quantified the localized corrosion resistance of the alloy in chloride-containing environments. The potentiodynamic-galvanostatic-potentiodynamic (PD-GS-PD) technique was used to determine the crevice corrosion repassivation potential (ER, CREV) in deaerated natural seawater at different temperatures for two Alloy 718 grades (i.e., aerospace, as per ASTM B670, and oil and gas, as per API 6ACRA, grades). Additionally, potentiodynamic polarization testing was conducted for the API 6ACRA grade in acidified solutions with varying chloride concentrations to simulate pit/crevice-like conditions. In the aerospace heat treatment condition, Alloy 718 suffered crevice corrosion at temperatures as low as 10°C, while the API 6ACRA grade remained unaffected at the same testing temperature. Stable crevice corrosion occurred at 20°C and 50°C for both grades.
期刊介绍:
CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion.
70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities.
Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives:
• Contribute awareness of corrosion phenomena,
• Advance understanding of fundamental process, and/or
• Further the knowledge of techniques and practices used to reduce corrosion.