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一、前言钛的缝隙腐蚀是钛材推广使用中最令人关注的问题之一。近二十年来,人们曾不同程度地研究过pH值、温度、氯化物浓度、缝隙尺寸等因素对钛缝隙腐蚀的影响,并根据各自的实验结果,提出了不同的缝隙腐蚀机理。主要的有“氧浓差说”、“Ti(Ⅲ)和Ti(Ⅳ)离子影响说”、“水份不足说”等观点。目前,多数人仍采用经典的夹片试验研究钛的缝隙腐蚀,对于缝隙腐蚀发生与发展过程中缝内介质组份的变化及其物理、化学图象还缺乏直接的现场信息。鉴于此,本文用微电极技术原位考察了热酸性氯化钠溶液中的钛缝隙腐蚀行为及其影响因素,提出了其机理。
I. INTRODUCTION Titanium crevice corrosion is one of the most interesting issues in the promotion and use of titanium. In the recent two decades, people have studied the influence of pH value, temperature, chloride concentration, pore size and other factors on the crevice corrosion of titanium to varying degrees. According to their experimental results, different crevice corrosion mechanisms have been proposed. The main “oxygen concentration that”, “Ti (Ⅲ) and Ti (Ⅳ) ion effect that”, “lack of water,” and other points of view. At present, most people still use the classic clip experiment to study the crevice corrosion of titanium, and there is no direct on-site information on the change of the media components and their physical and chemical images during the occurrence and development of crevice corrosion. In view of this, in this paper, the micro-electrode technology in situ examination of hot acid sodium chloride solution of titanium crevice corrosion behavior and its influencing factors, put forward its mechanism.