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exhibited distinct passivity phenomenon. Optical micrographs of the corroded surfaces showed general corrosion, extensive pitting and intergranular corrosion as well. Cyclic potentiodynamic polarization... increase of applied potential, the current density increases sharply, and this potential is considered oxide break-down (φbd) or pitting potential (φp), leading to localized corrosion, i.e. pits......
of ageing process: 图6 7150铝合金点蚀的诱发形貌 Fig. 6 Morphology showing initiation of pitting corrosion of 7150 Al alloy (φpit-φrep)被认为是再钝化区间,然而其能否作为局部腐蚀的评价标准是有争议的.早在1971年,WILDE等[19]就发现不锈钢的(φpit...[J]. Corrosion Science, 1977, 17(8): 635-646. [21] TRUEBA M, TRASATTI S P. Study of Al alloy corrosion in neutral NaCl by the pitting scan technique[J]. Materials Chemistry and Physics, 2010, 121(3......
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to the formation of pitting corrosion and intergranular corrosion. Fig.3 (b) shows the typical appearance of unnotched micro-sized specimen after corrosion in 3.0% NaCl solution for 30 d. No obvious pitting... Corrosion and fatigue in micro-sized Ni cantilever beams ZHANG Qiang(张强)1, GUO Xing-peng(郭兴蓬)1, LIU Yu(刘昱)1, DAI Neng-li(戴能利)2, LU Pei-xiang(陆培祥)2 1. Department of Chemistry and Chemical......
aging treatment, the corrosion modes of Mg–0.25Y and Mg–(2.5, 5, 8 and 15) Y alloys were uniform corrosion and pitting corrosion with small local deep corrosion. Key words: Mg–Y alloy; aging treatment... contents. In addition, the movement of the polarization curves was actually due to the difference in the pitting potential (Ept), which just matched the test results of self-corrosion potential. Table 2......
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polarization curves did not exhibit an active dissolution region near corrosion potential due to the presence of an oxide film on the electrode surface, which was followed by pitting corrosion. SEM images... and charge transfer decreased with the increase of ACN concentration. Key words: corrosion behavior; hafnium; acetonitrile; Et4NBr; electrochemical method; pitting corrosion; passive film 1......
and electrochemical technique. It is found that the distribution of β phase influences the corrosion morphology. Corrosion occurs preferentially in primary α phase and presents pitting corrosion feature... of electrode surface to some extent. Die-cast AZ91D takes place pitting corrosion, magnesium is dissolved in anode and hydrogen is reduced in cathode. Corrosion reaction reaches stable with time and OCP......
, the susceptibility to pitting corrosion of foils in Cl--contained solution is promoted. After pit etching, high ratio of corrosion area about 98% and high density of relatively uniformly distributed pits are obtained for the foil with about 20×10-6 Ga, while some huge pits form and the homogeneity of pitting corrosion decreases when the content of Ga reaches 80×10-6. Consequently, Ga, as an eco-friendly element......
, and characteristic potential of pitting Eb. The results indicate that the rare earths have effect on corrosion resisting properties of carbon-manganese clean steel, and the optimum contents of La is about...Effect of Rare Earths on Corrosion Resisting Properties of Carbon-Manganese Clean Steels 林勤1,孙学义1,郭锋1 (1.Physical Chemistry Department,University of Science and Technology Beijing,Beijing......
