AA6061铝合金Ti-Zr-Ce化学转化工艺
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摘要
以H_2TiF_6、H_2ZrF_6为主成膜剂,通过添加六偏磷酸钠和六水合硝酸铈,在铝合金表面制备了Ti-Zr-Ce转化膜。通过正交试验确定了最佳的成膜配方为:H_2TiF_6(质量分数为50%) 2.0mL/L,H_2ZrF_6(质量分数为40%) 1.0 mL/L,六偏磷酸钠0.50 g/L,六水合硝酸铈0.10 g/L,反应温度30℃,反应时间150 s,pH值3.5。Ti-Zr-Ce转化膜的自腐蚀电位为-0.577 V,自腐蚀电流密度为0.115μA/cm~2,耐蚀性好。
Ti-Zr-Ce conversion films were prepared on the surface of aluminum alloy with H_2TiF_6 and H_2ZrF_6 as main film-forming agents through adding sodium hexametaphosphate and cerium nitrate hexahydrate. The optimal film-forming formula was determined by orthogonal experiment as follows: H_2TiF_6(50%) 2.0 mL/L, H_2ZrF_6(40%) 1.0 mL/L, sodium hexametaphosphate 0.50 g/L, cerium nitrate hexahydrate 0.10 g/L, reaction temperature 30 ℃, reaction time 150 s, pH value 3.5. The Ti-Zr-Ce conversion film exhibit excellent corrosion resistance, its self-corrosion potential was-0.577 V and self-corrosion current density was 0.115 μA/cm~2.
Ti-Zr-Ce conversion films were prepared on the surface of aluminum alloy with H_2TiF_6 and H_2ZrF_6 as main film-forming agents through adding sodium hexametaphosphate and cerium nitrate hexahydrate. The optimal film-forming formula was determined by orthogonal experiment as follows: H_2TiF_6(50%) 2.0 mL/L, H_2ZrF_6(40%) 1.0 mL/L, sodium hexametaphosphate 0.50 g/L, cerium nitrate hexahydrate 0.10 g/L, reaction temperature 30 ℃, reaction time 150 s, pH value 3.5. The Ti-Zr-Ce conversion film exhibit excellent corrosion resistance, its self-corrosion potential was-0.577 V and self-corrosion current density was 0.115 μA/cm~2.
引文
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[2] YAZICI B,CULHA M,SOLMAZ R,et al.Investigation of adsorption and inhibitive effect of 2-mercaptothiazoline on corrosion of mild steel in hydrochloric acid media[J].Electrochimica acta,2008,53(20):5941-5952.
[3] LIU Y,SUN D,YOU H,et al.Corrosion resistance properties of organic-inorganic hybrid coatings on 2024 aluminum alloy[J].Applied surface science,2005,246(1):82-89.