助镀处理对Q235钢热浸镀铝层耐高温性能的影响
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摘要
为了获得Q235钢表面热浸镀铝的最优助镀剂配方,将Q235钢经过打磨、除油、除锈、助镀等前处理后进行热浸镀铝及镀后扩散热处理,以试样的抗高温氧化性能为指标设计正交试验对助镀剂配方进行优选,通过扫描电镜及能谱仪分析了镀层主要构成,通过高温氧化试验考察了镀层的抗高温氧化性能。结果表明:助镀剂的最佳配比为:200.0 g/L ZnCl_2,10.0 g/L NaNO_3,1.1 g/L CrO_3,25.0 g/L NaF,30.0 g/L CrO_3,0.2 g/L KMnO_4,且其中ZnCl_2的含量对试样抗高温氧化性能影响最显著。所得镀层主要成分为铁元素和铝元素,组织致密,抗高温氧化性能优良。
Q235 steel after different pretreatment procedures including polishing oil-removal,rust-removal,assistant plating and so on,was hot-dipped with aluminum. Afterwards,the high temperature resistance of the samples was tested. The optimal pretreatment process was achieved by calculating and analyzing the data from orthogonal experiment. The morphology and main composition of the aluminized coating were analyzed by SEM ad EDS. Furthermore,the high temperature resistance was tested through high temperature test. Results showed that the main composition of the coating was Fe and Al,and the coating structure was dense. Besides,the best ratio of fluxing agents was as follows:ZnCl_2200.0 g/L,NaNO_310.0 g/L,CrO_31.1 g/L,NaF 25.0 g/L,CrO_330.0 g/L and KMnO_40.2 g/L. The content of ZnCl_2 was the most significant factor to the high temperature oxidation resistance of the samples.
Q235 steel after different pretreatment procedures including polishing oil-removal,rust-removal,assistant plating and so on,was hot-dipped with aluminum. Afterwards,the high temperature resistance of the samples was tested. The optimal pretreatment process was achieved by calculating and analyzing the data from orthogonal experiment. The morphology and main composition of the aluminized coating were analyzed by SEM ad EDS. Furthermore,the high temperature resistance was tested through high temperature test. Results showed that the main composition of the coating was Fe and Al,and the coating structure was dense. Besides,the best ratio of fluxing agents was as follows:ZnCl_2200.0 g/L,NaNO_310.0 g/L,CrO_31.1 g/L,NaF 25.0 g/L,CrO_330.0 g/L and KMnO_40.2 g/L. The content of ZnCl_2 was the most significant factor to the high temperature oxidation resistance of the samples.
引文
[1]刘光明.材料处理技术概论[M].北京:化学工业出版社,2011:237-239,246-247.
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[3]文九巴,胡鹏飞,李晓源.稀土铈对热浸渗铝钢耐高温氧化性能的影响[J].热处理,2005,20(1):18-21.
[4]文九巴,李全安,张荥渊.稀土对热浸渗铝组织和耐腐蚀性影响的研究[J].材料热处理学报,2002,23(3):69-71.
[5]文九巴,李全安,张荣渊.稀土铝合金热浸镀工艺研究[J].热加工工艺,2002(5):24-25.
[2]訾树燕,胡世勃.Q235钢的直接电加热快速渗铝研究[J].煤矿机械,2003(2):16-18.
[3]文九巴,胡鹏飞,李晓源.稀土铈对热浸渗铝钢耐高温氧化性能的影响[J].热处理,2005,20(1):18-21.
[4]文九巴,李全安,张荥渊.稀土对热浸渗铝组织和耐腐蚀性影响的研究[J].材料热处理学报,2002,23(3):69-71.
[5]文九巴,李全安,张荣渊.稀土铝合金热浸镀工艺研究[J].热加工工艺,2002(5):24-25.