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紫外辐射对预沉积氯化钠的纯铜大气腐蚀过程的影响
李亨特
学位类型硕士
导师陈卓元
2017-05-12
学位授予单位中国科学院大学
学位授予地点北京
学位专业海洋腐蚀与防护
关键词纯铜 光电化学效应 半导体性质 大气腐蚀 紫外辐射
其他摘要本文研究了紫外辐射对预沉降 NaCl 盐粒的纯铜大气腐蚀过程的影响进行了
探究,研究发现紫外辐射能够明显促进纯铜的大气腐蚀速率。紫外辐射能够改变
腐蚀产物的形貌但不改变腐蚀产物的种类。在光照的条件下,锈蚀的纯铜片产生
了一个负的光电压,是由腐蚀产物的光电化学性质造成的。一般认为负移的电位
能够保护金属, 但是本研究中在该情况下却加速了纯铜的腐蚀。为了研究这一过
程, 我们将腐蚀产物刮下后涂覆在
FTO 导电玻璃表面制成薄膜光电极, 来研究
其光电化学效应。结果发现,光照下腐蚀产物光电极产生的光致电位表现为正移,
这和锈蚀的纯铜电极的现象正好相反。 如将薄膜光电极与干净的纯铜电极偶联,
发现该偶联体系的光致电位变化表现为正移, 而测量
FTO 薄膜光电极与干净纯
铜电极之间电流,电子从纯铜电极流入
FTO 薄膜光电极。说明是腐蚀产物在纯
铜表面发生的光电化学反应与在
FTO 玻璃表面发生的光电化学反应是不一样。
腐蚀产物在纯铜表面时,紫外辐射下激发腐蚀产物表现出光电化学效应产生光生
电子和空穴,电子流向溶液和溶液反应,空穴和基体反应,由于空穴反应速率比
电子快,导致电子积累,产生光电位负移而加速铜腐蚀的现象。当腐蚀产物在
FTO
玻璃表面时, 产生的光生空穴将不能与 FTO 玻璃反应, 电子却与溶液反应, 导
致空穴积累, 表现为该体系的光电位正移。 光电流的测定结果表明光照导致电子
从金属表面流向腐蚀产物, 也说明了加速铜腐蚀这一现象。
此外,本文还探究了紫外光照下多种半导体材料对纯铜大气腐蚀的影响,结
果表明在实际暴露中, 紫外光照条件下涂覆
TiO2 在能够对纯铜产生保护作用,
这与其光电化学作用有密切关系, 具体过程和反应机理还需进一步实验和研究

; The effects of ultraviolet illumination on NaCl-induced atmospheric corrosion of
pure copper were studied in this paper. It was found that the atmospheric corrosion rate
of pure copper can be significantly accelerated by UV illumination. While, the
corrosion morphology of copper under UV radiation changed but the type of corrosion
products did not change. Under the white light illumination, the corroded pure copper
showed a negatively shifted potential which is resulted from the photoelectrochemical
properties of the corrosion products. Generally, the negatively shifted potential is
companied with protection of the metal, but in this case it accelerated copper corrosion.
In order to study this process, scraping corrosion products and coated it on the surface
of FTO glass to fabricate thin film photoelectrode, which was used to research the
photoelectrochemical effect of corrosion products. FTO thin film photoelectrode under
white light induced a positively shifted potential. Coupling thin film photoelectrode and
clean copper electrode, it was found that under the white light illumination induced the
potential positively shift of this coupled system. To measure the current between
corrosion products FTO thin film electrode and the clean copper electrode, electrons
flew from the copper electrode into the FTO film photoelectrode. It was indicated that
the photoelectrochemical reactions of the corrosion products occurred on FTO glass
surface were different from those on the copper’s surface. On the copper’s surface,
ultraviolet radiation induced corrosion products’ photo-electrochemical effect to
produce electrons and holes, electrons flew to and reacted with the solution, meanwhile
photoinduced holes reacted with the copper directly. Since the reaction rate of holes is
faster than that of the electrons, which causes electrons accumulated and produce
negatively shifted potential of corroded copper with the accelerated corrosion. While,
on the FTO glass surface, photogenerated holes couldn’t react with FTO glass, but the
electrons reacted with solution, leading to the accumulation of the photo-generated
holes on the surface of electrode under white light radiation and resulted in produced
positive shift of potential. The photoinduced current which flew from the metal
electrode to corrosion products coated FTO thin film electrode also illustrates the
process of the accelerated corrosion under light illumination.
At the end of this dissertation, the influence of UV illumination on the atmospheric
corrosion with various semiconductor materials coated copper was also explored. The

results showed that the coated TiO2 can slow down the atmospheric corrosion of pure
copper in the actual exposure. The possible reason is caused by the
photoelectrochemical process of TiO
2, while the process and mechanism need to be
further studied in the future.

学科领域电化学 ; 应用化学
文献类型学位论文
条目标识符http://ir.qdio.ac.cn/handle/337002/136548
专题海洋腐蚀与防护研究发展中心
作者单位1.中国科学院海洋研究所
2.中国科学院大学
推荐引用方式
GB/T 7714
李亨特. 紫外辐射对预沉积氯化钠的纯铜大气腐蚀过程的影响[D]. 北京. 中国科学院大学,2017.
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