| HU Yu-long,AI Jian-yang,BU Shi-chao.Effect of Electrical Insulating Treatment with Alumina Composite Ceramic Coating on Galvanic Corrosion Behavior of 10CrNiCu-B10 Couple[J],51(1):150-160 |
| Effect of Electrical Insulating Treatment with Alumina Composite Ceramic Coating on Galvanic Corrosion Behavior of 10CrNiCu-B10 Couple |
| Received:January 23, 2021 Revised:June 13, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.01.016 |
| KeyWord:ceramic coating Al2O3 TiO2 copper alloy electrical insulation galvanic corrosion electric resistance porosity |
| Author | Institution |
| HU Yu-long |
Department of Foundation, Naval University of Engineering, Wuhan , China |
| AI Jian-yang |
Department of Foundation, Naval University of Engineering, Wuhan , China |
| BU Shi-chao |
Department of Foundation, Naval University of Engineering, Wuhan , China |
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| Abstract: |
| 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 α-Al2O3 and γ-Al2O3 phase, and the main phase was γ-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 10CrNiCu and B10, but it has not achieved the action of complete electrical insulation, and the galvanic cell between 10CrNiCu and B10 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 10CrNiCu 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 kΩ. 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 10CrNiCu steel in the joint interface takes place. |
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