Electrochemical behavior of an alpha-phase titanium alloy in oxidizing nitric acid environments: Influence of an oxygen-enriched layer

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Pub Date : 2023-10-04 DOI:10.5006/4412

Prafful Kumar Sinha

引用次数: 0

Abstract

ABSTRACT The study focuses on establishing the influence of an oxygen-enriched layer (OEL) on the electrochemical properties of an alpha-phase titanium alloy, Ti-Al-Zr, in oxidizing nitric acid environments. Heat treatment was given to the material at 760 °C for 700 h in air which resulted in the formation of an OEL on the surface. The electrochemical properties were studied and compared with as-received (AR) conditions by techniques like open circuit potential (OCP), potentiodynamic polarization, chronoamperometry and electrochemical impedance spectroscopy measurement. It was established that the presence of an OEL on the surface reduced the cathodic activity of oxidizing species on the material’s surface. The OCP value did not depend on the presence/absence of the OEL on the surface. The formation of the passive film was instantaneous for all conditions. The presence of the OEL on the surface promoted the formation of a protective passive film. The material with an OEL on the surface had a lower donor density as compared to the AR condition.

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α相钛合金在氧化硝酸环境中的电化学行为:富氧层的影响

摘要研究了富氧层(OEL)在氧化硝酸环境下对α相钛合金Ti-Al-Zr电化学性能的影响。将材料在760°C空气中热处理700 h，导致表面形成OEL。采用开路电位(OCP)、动电位极化、计时安培和电化学阻抗谱测量等技术研究了其电化学性能，并与实测(AR)条件进行了比较。结果表明，表面氧化电位的存在降低了材料表面氧化物质的阴极活性。OCP值与表面OEL的存在与否无关。在任何条件下，钝化膜的形成都是瞬间的。OEL在表面的存在促进了保护性钝化膜的形成。与AR条件相比，表面有OEL的材料具有较低的供体密度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

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.