Abstract

Titanium (Ti) and its alloys have attractive properties like high strength-to-weight ratio, excellent formability, biocompatibility, and corrosion resistance. These alloys are conventionally produced via subtractive manufacturing (SM) method, but recently new additive manufacturing (AM) method has been developed and can fabricate desired products by melting and stacking powders using a laser, electron beam, or a plasma arc. From a mechanical perspective, the strength and ductility of AM Ti alloys are comparable to or above those fabricated via SM because of their unique microstructure. However, AM Ti alloys corrosion resistance is still unknown, because of their defects and formation of martensite phase resulting from rapid solidification, hence new strategies were developed to evaluate localized corrosion resistance Consequently, a measurement method based on electrochemical critical localized corrosion temperature (E-CLCT) was adopted as ISO 22,910:2020 but its application should be limited at normal ranges of pH and temperatures corresponding to the human body because of the temperature scan during the E-CLCT testing. Therefore, electrochemical critical localized corrosion potential (E-CLCP) was introduced and proposed in this paper as a new criterion in evaluating the resistance against localized corrosions in biomedical AM Ti alloys in human body environments. AM Ti alloy samples without a hole and crevice former as well as an electrochemical polarization cell were used in the artificial physiological fluids. This study explores how to efficiently evaluate the localized corrosion resistance of AM Ti alloys such as Ti-6Al-4 V by measuring E-CLCP values in the artificial physiological fluids.

Graphic Abstract

中文翻译：

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使用电化学临界局部腐蚀电位评估通过增材制造制造的生物医学Ti-6Al-4 V合金的耐腐蚀性

摘要

钛（Ti）及其合金具有吸引人的特性，例如高强度重量比，出色的可成型性，生物相容性和耐腐蚀性。这些合金通常通过减成制造（SM）方法生产，但是最近开发了新的增材制造（AM）方法，可以通过使用激光，电子束或等离子弧熔化和堆叠粉末来制造所需的产品。从机械角度来看，AM Ti合金的强度和延展性与通过SM制成的那些具有可比性或更高，因为它们具有独特的微观结构。但是，AM Ti合金由于其缺陷和快速凝固而形成马氏体相，因此其耐蚀性仍是未知的，因此开发了评估局部耐蚀性的新策略。ISO 22,910：2020采用了基于电化学临界局部腐蚀温度（E-CLCT）的测量方法，但由于E-CLCT期间的温度扫描，因此应将其应用限制在正常pH值范围和与人体相对应的温度范围内测试。因此，本文提出并提出了电化学临界局部腐蚀电位（E-CLCP），作为评估人体环境中生物医学AM Ti合金对局部腐蚀的抵抗力的新标准。在人造生理液中使用了没有孔和缝隙形成器的AM Ti合金样品以及电化学极化池。

图形摘要