孔隙特性对铝基非晶合金涂层腐蚀行为的影响
Effect of pore characteristics on corrosion behavior of Al-based amorphous alloy coatings
查看参考文献31篇
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文摘
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采用超音速火焰喷涂(HVAF)技术制备1.36%高孔隙率(high porosity,HP)和0.86%低孔隙率(low porosity,LP)两种铝基非晶合金涂层,研究孔隙率对铝基非晶合金涂层腐蚀行为的影响。通过扫描电子显微镜(SEM),X射线衍射仪(XRD)并结合3D高分辨X射线衍射形貌(3D XRT)分析涂层孔隙率以及微观组织结构,利用电化学测试系统和接触角测量仪研究涂层的腐蚀行为,采用X射线光电子谱(XPS)分析两种涂层钝化膜成分。结果表明:LP涂层的自腐蚀电流密度(I_(corr))为3.0×10~(-6) A/cm~2,点蚀电位(E_(pit))为-0.40 V,而HP涂层的I_(corr)为6.0×10~(-6) A/cm~2,E_(pit)为-0.47 V,LP涂层具有更好的耐局部点蚀能力;LP涂层的电荷转移电阻(R_(ct))约为HP涂层的2倍;LP涂层具有更大的接触角,疏水性更好; LP涂层形成的钝化膜中RE_2O_3的含量大于HP涂层,进一步说明LP涂层具有更优异的耐蚀性。 |
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其他语种文摘
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High-velocity air-fuel spray(HVAF) technology was used to prepare two kinds of Al-based amorphous alloy coatings with high porosity(HP) of 1.36% and low porosity(LP) of 0.86%. The effects of porosities on the corrosion behavior of Al-based amorphous alloy coatings were studied. The porosities and microstructures of the coatings were analyzed by scanning electron microscope(SEM) and X-ray diffraction(XRD) combined with three-dimensional X-ray tomography(3D XRT). The corrosion properties of the coatings were studied by electrochemical testing system and contact angle measuring instrument. The passive film components of the two coatings were analyzed by X-ray photoelectron spectroscopy(XPS). The results show that the self-corrosion current density(I_(corr)) and pitting potential(E_(pit)) of the LP coatings are 3.0×10~(-6) A/cm~2 and -0.40 V, respectively. The I_(corr) and E_(pit) for HP coatings are 6.0×10~(-6) A/cm~2 and -0.47 V, respectively, signifying that the LP coating has better resistance to the localized corrosion;the charge transfer resistance(R_(ct)) of LP coatings is about twice than that of HP coating;the LP coating has a larger contact angle, which proves that LP coating has better hydrophobicity and stronger corrosion resistance;the contents of RE_2O_3 in the passive film formed on the LP coating are larger, which further indicates that LP coating has better corrosion resistance. |
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来源
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材料工程
,2024,52(7):173-181 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000929
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关键词
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非晶涂层
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阻抗谱
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腐蚀
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润湿
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疏水性
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地址
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1.
中国特种飞行器研究所, 结构腐蚀防护与控制航空科技重点实验室, 湖北, 荆门, 448035
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中国科学院金属研究所, 沈阳材料科学国家研究中心, 沈阳, 110016
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陆军装甲兵学院, 装备再制造技术国防科技重点实验室, 北京, 100072
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:7782223
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