胡裕龙,艾建阳,卜世超.氧化铝复合陶瓷涂层电绝缘处理对10CrNiCu-B10电偶对腐蚀行为的影响[J].表面技术,2022,51(1):150-160.
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].Surface Technology,2022,51(1):150-160 |
| 氧化铝复合陶瓷涂层电绝缘处理对10CrNiCu-B10电偶对腐蚀行为的影响 |
| Effect of Electrical Insulating Treatment with Alumina Composite Ceramic Coating on Galvanic Corrosion Behavior of 10CrNiCu-B10 Couple |
| 投稿时间：2021-01-23 修订日期：2021-06-13 |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.01.016 |
| 中文关键词: 陶瓷涂层 Al2O3 TiO2 铜合金 电绝缘 电偶腐蚀 电阻 孔隙率 |
| 英文关键词:ceramic coating Al2O3 TiO2 copper alloy electrical insulation galvanic corrosion electric resistance porosity |
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| 中文摘要: |
| 目的 采用等离子喷涂在铜合金B10表面制备了3种配比的Al2O3-TiO2复合陶瓷涂层，以研究复合陶瓷涂层电绝缘处理对10CrNiCu-B10电偶对腐蚀行为的影响。方法 采用X射线衍射仪(XRD)、扫描电镜(SEM)等对复合涂层进行了表征分析，将不同Al2O3/TiO2配比的复合陶瓷涂层串联在B10与10CrNiCu钢之间，组成电偶对，将电偶对及对比试样浸泡在3.5%NaCl溶液中，测定了电偶对和对比试样中10CrNiCu钢的失重、电位、电化学阻抗谱。结果 复合涂层主要由α-Al2O3和γ-Al2O3两种相组成，其中主要相为γ-Al2O3，TiO2与Al2O3形成钛酸铝。陶瓷涂层的电绝缘作用有效抑制了10CrNiCu-B10之间的电偶电池作用，但还没有达到完全电绝缘的效果，仍存在一定的电偶电池作用。增加TiO2的加入量，可降低复合陶瓷涂层的孔隙率，但也降低了涂层的电阻，降低了电绝缘作用，增大了电偶对中10CrNiCu钢的腐蚀速率。结论 电阻是影响氧化铝复合陶瓷涂层电绝缘作用的主要因素，复合涂层电阻值大于10 kΩ时，仍可发生明显的电偶腐蚀。复合陶瓷涂层绝缘性能的降低与Al2TiO5的影响有关。孔隙率对涂层电绝缘作用没有明显的直接影响，但粗糙多孔的涂层易在连接面形成缝隙，引起10CrNiCu钢连接面的腐蚀。 |
| 英文摘要: |
| 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 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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