| Summary: | 碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 100 === In this study, zinc, aluminum and copper, three basic metallic materials,
according to the requirement of ISO as well as CNS, nearby the Beitou
hot springs were evaluated. Two locations were selected; they are
Dun-Xu Technical School and Xin-Min Junior High School, for the
accommodation of the exposure facilities, based on their chemical of
sulfur compounds and one location (Xin-Min Junior High School) even
contains HCl. Analysis of weight loss, electrochemical polarization and
surface analysis of the corrosion products were analyzed by XRD and
XPS. The corrosion products pf zinc and copper are mainly composed of
ZnS and ZnO for the zinc, and Cu2S, CuS, Cu2O and CuO for the copper;
CuCl and CuCl2 are also observed at the exposure site of Xin-Min Junior
High School. Aluminum only takes the oxide form of Al2O3 which is
usually protective; no sulfide was observed on aluminum. It may
conclude that aluminum is corrosion-resistant in sulfur containing
environments. Based on the results up to a 90 days study, it is by no
means a complete coverage of the corrosion products and continuously
grow at this stage of observation. It is necessary to further keep on the
track of the development of surface structure and chemistry of the
exposures in the two test sites.
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