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含Cl-溶液中SO2-4对316不锈钢临界点蚀温度的影响

廖家兴 , 蒋益明 , 吴玮巍 , 钟澄 , 李劲 , 宋洪伟

金属学报

采用外加恒电位下腐蚀电流—温度扫描的方法,研究了在0.5wt.%Cl-溶液中,硫酸根离子浓度对316不锈钢的点腐蚀行为的影响。结果表明:随着硫酸根离子浓度的增加,钝化电流增加,开路电位降低;当硫酸根离子浓度低于0.42wt.%时,316不锈钢的临界点蚀温度比不存在硫酸根离子时的临界点蚀温度低,当硫酸根离子浓度大于0.42wt.%时,316不锈钢的临界点蚀温度比不存在硫酸根离子时的临界点蚀温度高。从竞争吸附的角度进行分析,对硫酸根离子加速与抑制点蚀两种作用规律的形成原因进行了解释。

关键词: 不锈钢 , Critical pitting temperature (CPT) , Sulphate ion , Chloride ion

Effects of Chloride Ion on the Texture of Copper and Cu-ZrB2 Coatings Electrodeposited from Copper Nitrate Solution in Different Plating Modes

Dongming GUO

材料科学技术(英)

For the first time, the texture of copper and Cu-ZrB2 coatings produced from copper nitrate solution was studied. Chloride ion shows different effects on the deposit texture under direct current (DC) and pulse current (PC) conditions. Copper deposits are strongly <220> textured in DC plating with and without chloride ion. While in PC condition, the predominant texture shifts from <220> to <200> as the chloride ion concentration exceeds 20 mg/l. The addition of ZrB2 particles enhances the cathodic polarization of copper deposition, which improves the growth of (111) plane. However, this improvement can be eliminated by further addition of chloride ion.

关键词: Texture , null , null , null

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