CN106337177A - 一种铁铝组合件化学氧化工艺 - Google Patents

一种铁铝组合件化学氧化工艺 Download PDF

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CN106337177A
CN106337177A CN201610966118.9A CN201610966118A CN106337177A CN 106337177 A CN106337177 A CN 106337177A CN 201610966118 A CN201610966118 A CN 201610966118A CN 106337177 A CN106337177 A CN 106337177A
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aluminum
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彭先勇
许苏
于桂斌
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Chongqing Changan Industry Group Co Ltd
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Abstract

一种铁铝组合件化学氧化工艺,根据铁铝组合件产品结构特点,采用弱碱性清洗剂去油,采用中强酸磷酸、对苯二酚进行酸洗。弱碱性的残留清洗剂不会对钢、铝合金件产生腐蚀,残留在铁、铝组合缝隙中的磷酸,与金属基体反应,会生成磷化膜,也不会继续对产品产生腐蚀。采用铬酸酐、铁氰化钾、氟化钠、硼酸混合的溶液进行化学氧化,形成能满足一定耐蚀性的氧化膜;烘干前采用酒精脱水,减少自来水中钙、镁、氯等杂质离子残留在产品表面造成氧化膜变色的可能性。产生的废水处理简单。本发明设计的去油、酸洗、化学氧化工艺配方,设计的化学氧化工艺流程,能满足铁铝组合件的耐蚀性要求。

Description

一种铁铝组合件化学氧化工艺
技术领域
本发明属于化学氧化技术领域,特别涉及一种在铁铝组合件上的化学氧化工艺方法。
背景技术
铝及其合金的氧化处理,通常分为化学氧化和电化学氧化两大类。由于化学氧化具有所需设备简单,操作方便,成本低和适用范围广等特点,在生产领域得到广泛应用。
铁铝组合件(钢铁件嵌在铝合金件上),有不同程度的间隙,溶液渗透进入缝隙,水洗性不好,产品在贮存时,残留的强酸、强碱液会产生腐蚀,传统的化学氧化工艺无法满足铁铝组合件耐蚀性要求,需采取特殊的工艺进行氧化处理。
发明内容
本发明的目的就是为了克服上述背景技术的不足,而提供一种在铁铝组合件上的化学氧化工艺方法。
本发明所涉及的铁铝组合件上的化学氧化工艺,采用弱碱性清洗材料去油,采用中强酸磷酸、对苯二酚进行酸洗。弱碱性的残留清洗材料不会对钢、铝合金件产生腐蚀,残留在铁、铝组合缝隙中的磷酸,与金属基体反应,会生成磷化膜,也不会继续对产品产生腐蚀。
采用铬酐、铁氰化钾、氟化钠、硼酸混合的溶液进行化学氧化,形成能满足一定耐蚀性的氧化膜;烘干前采用酒精脱水,减少自来水中钙、镁、氯等杂质离子残留在产品表面造成氧化膜变色的可能性。产生的废水处理简单。
设计的去油、酸洗、化学氧化工艺配方,设计的化学氧化工艺流程,能满足铁铝组合件的耐蚀性要求。
本发明所述的一种铁铝组合件化学氧化工艺,其工序如下:
1)装零件→2)化学去油→3)流动热水洗→4)流动冷水洗→5)酸洗→6)三级冷水洗→7)化学氧化→8)二级冷水洗→9)封闭→10)三级冷水洗→11)两槽酒精洗→12)烘干。
具体步骤是:
1)装零件;
2)化学去油所用工作槽为1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管。化学去油工序溶液的配方及参数:
三聚磷酸钠能缓冲溶液的pH值,具有一定的皂化能力,而且又是一种乳化剂,对油脂具有乳化分散作用;硅酸钠在水中具有皂化和较强的乳化能力,对铝这种金属具有缓蚀作用;
3)流动热水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
4)流动冷水洗;流动冷水洗该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
时间: 0.2~0.5min
5)酸洗:酸洗工序采用PP材质的塑料槽,酸洗材料为工业磷酸、对苯二酚、混合醇的组合物。酸洗工序溶液的配方及参数:
6)三级冷水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
时间: 0.2~0.5min
7)化学氧化所用工作槽为PP材质的塑料槽,该工序溶液的配方及工艺参数:
铬酸酐是氧化剂,是成膜的必要成分;氟化钠起活化作用,与铬酸酐相互协同而生成致密的膜层;加入硼酸是为了控制氧化反应速度和改善膜层的外观,使膜层更为致密;
8)二级冷水洗;二槽流动冷水洗、三槽流动冷水洗采用PP材质的两联、三联清洗塑料槽,二级冷水洗采用的是两级逆流清洗工艺,三级冷水洗采用的是三级逆流清洗工艺,水流动的方向和工件运行的方向相反。自来水只在最后一个工作槽补充,逆向流动到前一个工作槽,排水只在最前面的工作槽排走,达到节约用水的目的;
9)封闭该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,封闭工序溶液的配方及工艺参数:
工业重铬酸钾: 80~100g/L
温度: 80~100℃
时间: 15~20min
10)三级冷水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
时间: 0.2~0.5min
流动冷水洗该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
11)两槽酒精洗该工序采用1Cr18Ni9Ti材质的不锈钢槽,采用两次工业酒精脱水,目的是去除零件表面水分,该工序工艺参数为:
工业酒精 100%
温度 室温
时间 0.2~0.4min;
12)烘干。
本发明的铁铝组合件的化学氧化工艺方法具有操作简单,适用范围广,解决了产品的变色、防腐蚀、贮存问题,具有成本低廉,工艺简单,操作方便等特点。
具体实施方式
实施例
本实施例所涉及的铁铝组合件的化学氧化工艺具体实施方式如下:
本发明所涉及的在铁铝组合件上的化学氧化工艺方法,采用弱碱性清洗材料去油,采用中强酸磷酸、对苯二酚进行酸洗。弱碱性的残留清洗材料不会对钢、铝合金件产生腐蚀,残留在铁、铝组合缝隙中的磷酸,与金属基体反应,会生成磷化膜,也不会继续对产品产生腐蚀。
采用铬酐、铁氰化钾、氟化钠、硼酸混合的溶液进行化学氧化,形成能满足一定耐蚀性的氧化膜;烘干前采用酒精脱水,减少自来水中钙、镁、氯等杂质离子残留在产品表面造成氧化膜变色的可能性。产生的废水处理简单。
设计的去油、酸洗、化学氧化工艺配方,设计的化学氧化工艺流程,能满足铁铝组合件的耐蚀性要求。
本发明所述的一种在铁铝组合件上的化学氧化工艺方法,其工序如下:
1)装零件→2)化学去油→3)流动热水洗→4)流动冷水洗→5)酸洗→6)三级冷水洗→7)化学氧化→8)二级冷水洗→9)封闭→10)三级冷水洗→11)两槽酒精洗→12)烘干。
具体步骤是:
1)装零件;
2)化学去油所用工作槽为1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管。化学去油工序溶液的配方及参数:
三聚磷酸钠能缓冲溶液的pH值,具有一定的皂化能力,而且又是一种乳化剂,对油脂具有乳化分散作用;硅酸钠在水中具有皂化和较强的乳化能力,对铝这种金属具有缓蚀作用;
3)流动热水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
4)流动冷水洗;该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
时间: 0.2~0.5min
5)酸洗:酸洗工序采用PP材质的塑料槽,酸洗材料为工业磷酸、对苯二酚、混合醇的组合物。酸洗工序溶液的配方及参数:
6)三级冷水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
时间: 0.2~0.5min
流动冷水洗该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
7)化学氧化所用工作槽为PP材质的塑料槽,该工序溶液的配方及工艺参数:
铬酸酐是氧化剂,是成膜的必要成分;氟化钠起活化作用,与铬酸酐相互协同而生成致密的膜层;加入硼酸是为了控制氧化反应速度和改善膜层的外观,使膜层更为致密;
8)二级冷水洗;
9)封闭 该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,封闭工序溶液的配方及工艺参数:
工业重铬酸钾: 80~100g/L
温度: 80~100℃
时间: 15~20min
10)三级冷水洗该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
时间: 0.2~0.5min
流动冷水洗该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
二槽流动冷水洗、三槽流动冷水洗采用PP材质的两联、三联清洗塑料槽,二级冷水洗采用的是两级逆流清洗工艺,三级冷水洗采用的是三级逆流清洗工艺,水流动的方向和工件运行的方向相反。自来水只在最后一个工作槽补充,逆向流动到前一个工作槽,排水只在最前面的工作槽排走,达到节约用水的目的;
11)两槽酒精洗该工序采用1Cr18Ni9Ti材质的不锈钢槽,采用两次工业酒精脱水,目的是去除零件表面水分,该工序工艺参数为:
工业酒精 100%
温度 室温
时间 0.2~0.4min;
12)烘干。

Claims (1)

1.一种铁铝组合件化学氧化工艺,其特征是该工艺步骤如下:
1)装零件;
2)化学去油 所用工作槽为1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管。化学去油工序溶液的配方及参数:
三聚磷酸钠能缓冲溶液的pH值,具有一定的皂化能力,而且又是一种乳化剂,对油脂具有乳化分散作用;硅酸钠在水中具有皂化和较强的乳化能力,对铝这种金属具有缓蚀作用;
3)流动热水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
4)流动冷水洗;该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
5)酸洗:酸洗工序采用PP材质的塑料槽,酸洗材料为工业磷酸、对苯二酚、混合醇的组合物。酸洗工序溶液的配方及参数:
6)三级冷水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
时间: 0.2~0.5min
流动冷水洗 该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
7)化学氧化 所用工作槽为PP材质的塑料槽,该工序溶液的配方及工艺参数:
铬酸酐是氧化剂,是成膜的必要成分;氟化钠起活化作用,与铬酸酐相互协同而生成致密的膜层;加入硼酸是为了控制氧化反应速度和改善膜层的外观,使膜层更为致密;
8)二级冷水洗;二槽流动冷水洗、三槽流动冷水洗采用PP材质的两联、三联清洗塑料槽,二级冷水洗采用的是两级逆流清洗工艺,三级冷水洗采用的是三级逆流清洗工艺,水流动的方向和工件运行的方向相反。自来水只在最后一个工作槽补充,逆向流动到前一个工作槽,排水只在最前面的工作槽排走,达到节约用水的目的;
9)封闭该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,封闭工序溶液的配方及工艺参数:
工业重铬酸钾: 80~100g/L
温度: 80~100℃
时间: 15~20min
10)三级冷水洗;该工序采用1Cr18Ni9Ti材质的不锈钢槽,内置蛇形蒸汽加热管,流动热水洗工序的工艺参数:
温度: ≥80℃
时间: 0.2~0.5min
流动冷水洗 该工序采用PP材质的塑料槽,工艺参数为:
温度 室温
时间 0.2~0.5min
二槽流动冷水洗、三槽流动冷水洗采用PP材质的两联、三联清洗塑料槽,二级冷水洗采用的是两级逆流清洗工艺,三级冷水洗采用的是三级逆流清洗工艺,水流动的方向和工件运行的方向相反。自来水只在最后一个工作槽补充,逆向流动到前一个工作槽,排水只在最前面的工作槽排走,达到节约用水的目的;
11)两槽酒精洗 该工序采用1Cr18Ni9Ti材质的不锈钢槽,采用两次工业酒精脱水,目的是去除零件表面水分,该工序工艺参数为:
工业酒精 100%
温度 室温
时间 0.2~0.4min;
12)烘干。
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