卢锦堂
,
汪燃原
,
孔纲
表面技术
doi:10.3969/j.issn.1001-3660.2010.01.009
热浸镀锌是保护混凝土钢筋的有效措施之一.用饱和Ca(OH)_2溶液模拟混凝土孔隙液,研究热镀锌层在该模拟液中的腐蚀行为.采用电化学测试、SEM、EDS和XRD手段分别分析了试样在不同浸泡阶段的电化学参数、表面微观形貌以及腐蚀产物的化学成分和相组成,结果表明:在浸泡腐蚀过程中,锌晶粒的晶界处优先出现腐蚀小孔,然后在小孔附近开始生成锌酸钙晶体Ca[Zn(OH)_3]_2·2H_2O,随着锌酸钙晶体不断生长,逐渐覆盖锌层表面,形成耐蚀性逐渐增强的保护层.当锌基底被锌酸钙晶体完全覆盖后,腐蚀电流密度J_(corr)降至临界钝化值附近,锌层处于钝化状态.
关键词:
热镀锌
,
混凝土模拟液
,
腐蚀产物
,
电化学
Fengling XU
,
Baorong HOU
金属学报(英文版)
doi:10.1016/S1006-7191(08)60096-4
The title compounds 1-(4,5-dihydro-3-phenyl pyridine-1-yl)-2-(1H-1,2,4-triazole-1-yl) ethyl ketones were studied as a corrosion inhibitor in a mild steel in 1 mol /L hydrochloric acid solution using weight loss measurement, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). Results indicated that these compounds had excellent inhibition properties. Polarization curves indicated that the inhibitor behaved mainly as mixed-type inhibitor. The EIS results showed that the charge transfer controlled the corrosion process in the uninhibited and inhibited solutions. Adsorption of the inhibitor on the mild steel surface followed Langmuir's adsorption isotherm with negative value of the free energy of adsorption ΔG°ads. The thermodynamic parameters of adsorption were determined and discussed.
关键词:
Materials protection
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