纳米Fe－10Cr涂层电化学腐蚀行为影响研究 I钝化性能

中国腐蚀与防护学报

2007, Vol. 27

Issue (1): 35-42

研究报告

本期目录 | 过刊浏览

纳米Fe－10Cr涂层电化学腐蚀行为影响研究 I钝化性能

孟国哲; 李瑛; 王福会

哈尔滨工程大学材料科学与化学工程学院

CORROSION BEHAVIOR OF Fe-10Cr NANOCRYSTALLINE COATINGS ( I ) THE PASSIVE BEHAVIOR OF Fe-10CrNANOCRYSTALLINE COATINGS IN ACIDIC SOLUTION

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哈尔滨工程大学材料科学与化学工程学院

全文: PDF(1831 KB)

摘要: 利用磁控溅射技术制备出了晶粒尺寸为20 nm～30 nm的Fe-10Cr合金涂层.通过动电位极化曲线、电化学阻抗谱图（EIS）和Mott-Schottky分析等电化学测试手段，探讨了Fe-10Cr纳米涂层在0.05 mol/L H2SO4+0.25 mol/L Na2SO4溶液中的钝化性能。发现纳米化使材料的活性溶解增强；在钝化膜形成过程中Cr更容易富集，从而更容易钝化；纳米化后，材料表面钝化膜中的载流子密度下降，化学稳定性提高.

关键词 ：纳米晶, 晶粒尺寸, 腐蚀行为, 钝化, 钝化膜

Abstract：Fe-10Cr nanocrystalline ( nc ) coating with the grain size about 20 nm to 30 nm was fabricated on a glass substrate by magnetron sputtering technique.The corrosion behavior of the Fe-10Cr nc coating and its counterpart alloys were investigated in 0.05 mol/L H2SO4+0.25 mol/L Na2SO4 solution by polarization curves.The results showed that the active dissolution of Fe-10Cr nc coating was accelerated as comparing with its counterpart Fe-10Cr cast alloy.For Fe-10Cr nc coating,it had a higher tendency to passive in acid solution and the passive current density was lower as compaed with its counterpart alloy.The further average active energy measurement,EIS measurement and Mott-Schottky analysis revealed that the average active energy for the dissolving reaction of the Fe-10Cr nc coating was higher.This is attributed to the higher defect density on the nc coating.On the other hand,even though the same n type semiconductor passive film was formed on both nc sputtering coating and its counterpart alloy,but Cr was easier to accumulate in the passive film of Fe-10Cr nc coating and the donor density in its passive film was lower.The higher passive ability of the nc sputtering coating was attributed to the more Cr accumulated in the passive film and the higher chemical stability of the passivity film.

Key words： nanocystalline grain size corrosion behavior passive passive film

收稿日期: 2005-07-26

ZTFLH:

TG17.1

通讯作者: 孟国哲 E-mail: mengguozhe@hrbeu.edu.cn

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孟国哲; 李瑛; 王福会 . 纳米Fe－10Cr涂层电化学腐蚀行为影响研究 I钝化性能[J]. 中国腐蚀与防护学报, 2007, 27(1): 35-42 .

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https://www.jcscp.org/CN/Y2007/V27/I1/35

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