Effect of Electrical Insulating Treatment with Alumina Composite Ceramic Coating on Galvanic Corrosion Behavior of 10CrNiCu-B10 Couple

被引：0
|
作者：
Hu Y.-L. [1 ]
Ai J.-Y. [1 ]
Bu S.-C. [1 ]
机构：
[1] Department of Foundation, Naval University of Engineering, Wuhan
来源：
Surface Technology | 2022年 / 51卷 / 01期
关键词：
Al2O3; Ceramic coating; Copper alloy; Electric resistance; Electrical insulation; Galvanic corrosion; Porosity; TiO2;
D O I：
10.16490/j.cnki.issn.1001-3660.2022.01.016
中图分类号：
学科分类号：
摘要：
The work aims to investigate the effect of electrical insulating treatment with composite ceramic coating on corrosion behavior of 10CrNiCu-B10 galvanic couple by depositing three kinds of composite ceramic coatings with various Al2O3/TiO2 ratio on B10 surface using plasma spray. The coatings were mainly characterized by XRD and SEM. The galvanic couple samples were prepared by series connecting 10CrNiCu steel, composite ceramic coating with various Al2O3/TiO2 ratio and B10 cupronickel. The as-prepared galvanic couple samples were immersed in 3.5% NaCl solution together with contrast samples, and the weight loss, potential, and electrochemical impedance spectroscopy (EIS) of 10CrNiCu steel in the galvanic couple samples and contrast samples were measured. The composite ceramic coatings were mainly composed of a-Al2O3 and Y-Al2O3 phase, and the main phase was y-Al2O3, aluminum titanate (Al2TiO5) was formed by adding TiO2 to Al2O3. The electrical insulation of composite ceramic coatings reduced effectively the action of galvanic cell between 1ocrNicu and B1o, but it has not achieved the action of complete electrical insulation, and the galvanic cell between 1ocrNicu and B1o still existed. With the increase of the adding amount of TiO2, the porosity of composite ceramic coating decreased, but the electrical resistance of composite ceramic coating also decreased, which reduced the action of electrical insulation and increased the corrosion rate of 1ocrNicu steel in the galvanic couple. The resistance is the main factor influencing the electrical insulating action of alumina composite ceramic coating. The galvanic corrosion can still take place while the resistance of composite ceramic coating is larger than 10 kfl. The decrease of the insulating performance of composite ceramic coating is related with Al2TiO5. There is not an obvious direct relation between porosity and electrical insulating action of coating. But the crevice in the joint between steel and coating tends to be formed because of porous and rough coating surface, and the corrosion of 1ocrNicu steel in the joint interface takes place. © 2022, Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：150 / 160
页数：10
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