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that pitting corrosion has occurred. The wider defect can be clearly observed, as shown in Fig.1. The stress corrosion attack may initiate from some of these local defects. Several cracks initiation...]. The 7150 alloy contains more Cu-bearing particles, which contributes to the pitting corrosion, as shown in Fig.2(b). The defects formed by localized anodic dissolution promote not only localization......
典型耐海水腐蚀钢中Ni和Cr耐点蚀作用的比较曹国良1,李国明1,陈珊1,常万顺1,陈学群1(1.湖北省武汉市海军工程大学理学院化学与材料系)摘 要:选择Ni-Cu-P和Cr-Cu-P两类典型的耐海水腐蚀钢,在pH=10的3%(质量分数)NaCl溶液中进行极化实验,比较了钢的点蚀诱发敏感性;在3%海盐水中进行间浸挂片实验,评价了钢的点蚀扩展速度;利用OM,电子探针(EPMA),SEM和XRD分析钢中夹杂物,腐蚀形貌和锈层的特征.结果表明,Cr-Cu-P钢中的点蚀诱发敏感性要低于Ni-Cu-P,且脱氧程度的差异不会......
pitting corrosion. The above suggests show that the Sn-9Zn alloy is not easily corroded in 0.5 mol/L NaCl solution at room temperature, and the addition of a proper amount of cobalt is helpful..., which is denser and more stable than that of the cobalt free alloy, the pitting dissolution occurs until the degree of corrosion is less in the process of secondary passivation. Generally, the addition......
corrosion initiation on Al2024-T3 via fluorescence probe and characterized the initial state of pitting in situ[8]. Sibi used SABF, lumogallion and Phen Green to study the selective corrosion process... Preparation and performance of fluorescent sensing coating for monitoring corrosion of Al alloy 2024 LI Song-mei(李松梅), ZHANG Hong-rui(张洪瑞), LIU Jian-hua(刘建华) School of Materials Science......
are similar. However, EIS plot of copper in magnetized sea water shifts rightwards due to the effect of magnetic field on sea water. The corrosion process of copper in magnetized sea water is pitting corrosion... in heat exchangers, heat conductors and marine engineering [4-6]. Many accidents of copper corrosion have happened in the cooling system of electric machine recently. And the pitting corrosions......
for the as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys. The corrosion morphology of as-cast sample shows pitting corrosion and little filiform corrosion, but that of the extruded sample shows pitting corrosion..., the extruded Mg-5Y-7Gd-1Nd-0.5Zr alloy after immersion 24 h does not come up the filiform corrosion because of the grain-refinement. The pitting corrosion for extruded sample turns up later and lighter than......
solution can reduce the pitting corrosion resistance, enhance the pitting current density and improve the density and uniform distribution of pits and tunnels due to formation of the micro Zn-Al galvanic local cells. The special capacitance of etched foil grows with the increase of Zn2+ concentration. Key words: Al foil; polarization; pitting corrosion; electrochemical etching; Al electrolytic......
inhibitors (Figs. 2(c) and (d)) are added, the specimen surface corrodes much more lightly and localized corrosion susceptibility increases, characterized by the presence of a large number of pitting..., part of the specimens remain bright, and some specimens exhibit obvious pitting. When no inhibitor is added, severe uniform corrosion occurs on the surface of the sample, and abundant black iron......
slight corrosion on the surface, while the white iron has heavy pitting corrosion on the surface shown in Fig.7(b). There also exist some corrosion traces on the stainless steel surface...Article ID: 1003-6326(2005)05-1003-06 Wear resistance and corrosion resistance of VCp particle reinforced stainless steel composites YAO Xiu-rong(姚秀荣)1, 2, HAN Jie-cai(韩杰才)1, ZUO Hong-bo(左洪波)1......
, 58(2): 286-294. [22] ELOLAl A S, OTERO T F, PORRO A. Evolution of the pitting of aluminum exposed to the atmosphere[J]. Corrosion, 1992, 48(10): 854-863. [23] LARSEN M H, WALMSLEY J C, LUNDER O... corrosion. Due to the pitting on the grain boundaries, the intergranular corrosion initiated. The sulfide in the atmosphere can penetrate into the grain boundary region along with the corrosive medium......
