硅酸盐体系电解液中添加Na2WO4对LY12铝合金陶瓷膜性能的影响

doi:10.13251/j.issn.0254-6051.2021.04.027

摘要/Abstract

摘要： 通过SEM、XRD、硬度试验、电化学腐蚀试验研究了在硅酸盐体系电解液中加入不同浓度的Na₂WO₄对LY12铝合金微弧氧化陶瓷膜表面形貌及性能的影响。结果表明,添加Na₂WO₄改变了膜层的微观结构,使微弧氧化膜层硬度增加,表面平滑,呈现出小而少的孔洞结构,且表面堆积少量形状不规则的白色质点;随着Na₂WO₄添加量的增加,膜层的硬度值呈现先增加后降低的趋势,当Na₂WO₄含量为4 g/L时,膜层达到最高硬度440.3 HV0.3,较基体(硬度值约168 HV0.3)提升了272.3 HV0.3;XRD分析证明W元素参与了微弧氧化过程,并生成W的氧化物WO₃,陶瓷层物相主要由α-Al₂O₃和γ-Al₂O₃以及WO₃组成;电化学极化曲线分析结果表明添加剂Na₂WO₄有效地提高了膜层的耐腐蚀性能,耐腐蚀性能最好的添加量为 1 g/L,此时自腐蚀电位为-532.0 mV,腐蚀电流为0.011 μA。Na₂WO₄的添加可有效改善陶瓷膜层的表面形貌及性能。综合考虑膜层的性能,添加剂Na₂WO₄的最佳添加量为 4 g/L。

关键词: LY12铝合金, 微弧氧化, 硅酸盐体系, Na₂WO₄, 陶瓷膜层

Abstract: Na₂WO₄ additive was added to the electrolyte of silicate system. The effect of concentration of Na₂WO₄ additive on surface morphology and properties of micro-arc oxidation ceramic film on LY12 aluminum alloy was studied by means of SEM, XRD, hardness test and electrochemical corrosion test. The results show that with the addition of Na₂WO₄, the microstructure of the film is changed, and the hardness of the film increases, the surface is smooth, and there are fewer small holes and a small amount of irregular white particles on the surface. With the increase of Na₂WO₄, the hardness of the film increases first and then decreases. When the Na₂WO₄ content is 4 g/L, the maximum hardness of the film is 440.3 HV0.3, which is increased by 272.3 HV0.3 compared with that of the substrate (about 168 HV0.3). XRD analysis shows that W element participates in the micro-arc oxidation process, and forms oxide WO₃. The ceramic layer mainly consists of α-Al₂O₃, γ-Al₂O₃ and WO₃. The electrochemical polarization curve analysis shows that addition of Na₂WO₄ effectively improves the corrosion resistance of the film, and the corrosion resistance is the best when the additive amount is 1 g/L, the corrosion potential is -532.0 mV and the corrosion current is 0.011 μA. The addition of Na₂WO₄can effectively improve the surface morphology and properties of the ceramic film. The optimal addition amount of the Na₂WO₄additive is 4 g/L so as to obtain the comprehensive performance of the film.

Key words: LY12 aluminum alloy, micro-arc oxidation, silicate system, Na₂WO₄, ceramic film

中图分类号:

TG174

何巧成, 姜文勇, 陈鹿, 王长亮, 武鹏海. 硅酸盐体系电解液中添加Na₂WO₄对LY12铝合金陶瓷膜性能的影响[J]. 金属热处理, 2021, 46(4): 152-156.

He Qiaocheng, Jiang Wenyong, Chen Lu, Wang Changliang, Wu Penghai. Influence of adding Na₂WO₄ to electrolyte of silicate system on properties of ceramic film on LY12 aluminum alloy[J]. Heat Treatment of Metals, 2021, 46(4): 152-156.

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硅酸盐体系电解液中添加Na₂WO₄对LY12铝合金陶瓷膜性能的影响

Influence of adding Na₂WO₄ to electrolyte of silicate system on properties of ceramic film on LY12 aluminum alloy

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