| 引用本文: | 张军军,李文芳,杜军.6063铝合金铈锰转化膜前处理工艺研究[J].材料科学与工艺,2012,20(5):132-137,142.DOI:10.11951/j.issn.1005-0299.20120526. |
| ZHANG Jun-jun,LI Wen-fang,DU Jun.Pretreatment process on Ce-Mn ponversion poating of aluminium alloy[J].Materials Science and Technology,2012,20(5):132-137,142.DOI:10.11951/j.issn.1005-0299.20120526. |
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| 摘要: |
| 采用光学显微镜分析6063轧制铝合金经8种前处理工艺处理后对表面形貌和转化成膜效果的影响；选择了其中四种具有代表性的转化膜,在3.5% NaCl 溶液中的进行极化曲线和交流阻抗研究.较佳前处理工艺为,水磨砂纸逐级打磨至1000# SymbolnB@在强碱性溶液(100 g/L NaOH+ 40g/LNa3PO4+15g/L Na2SiO3)中60 ℃,超声去油处理2分钟 SymbolnB@混合酸溶液(20%HNO3 +10%H3PO4 + 5%HF)浸泡1分钟SymbolnB@10 g/LNaOH溶液中浸渍30秒,每步间用蒸馏水清洗三次.采用扫描电子显微镜(SEM)和能谱(EDS)分析了4种前处理工艺对成膜前后表面的形貌和成分影响,表明铝合金经前处理后表面洁净,阴极点适当暴露却均匀分布,生成的Ce-Mn转化膜完整,耐腐蚀能力强. |
| 关键词: 铝合金 铈锰转化膜 前处理 耐蚀性 |
| DOI：10.11951/j.issn.1005-0299.20120526 |
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| 基金项目:粤港关键领域重点突破(佛山专项)专项基金资助项目(2008Z012);广东省重大科技专项(产业共性技术)基金资助项目(2009A08025002). |
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| Pretreatment process on Ce-Mn ponversion poating of aluminium alloy |
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ZHANG Jun-jun1, LI Wen-fang2, DU Jun2
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1.School of Chemistry and Chemical Engineering,Guangdong Pharmaceutical University,Zhongshan 528458,China;2.College of Material Science and Engineering,South China University of Technology,Guangzhou 510641,China
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| Abstract: |
| Eight kind pretreatment progresses were proposed as pretreatment of 6063 die-cast aluminium alloy,surface morphologies of untreated or treated were observed by optical microscope.The polarization curves and electrochemical impedance spectroscopy for the conversion coatings obtained after different pretreatments were measured in a 3.5% (mass fraction) NaCl solution.A optimal pretreatment progress was obtained as following:polishing from 180# to 1000# by grit emery papers SymbolnB@alkaline cleaning with 100g/LNaOH+40g/LNa3PO4+15 g/LNa2SiO3 for 2 min at 60oC SymbolnB@ acid cleaning with 20%HNO3 + 10%H3PO4 + 5%HF for 1 min at room temperature SymbolnB@ surface activation with 10g/LNaOH for 30 second SymbolnB@ washed three time with distilled water and dries.The morphology of the surface of Al alloy obtained after pretreatment,uncoated or coated in Ce(NO3)3 and KMnO4 chemical conversion solution were studied by scanning electron microscopy (SEM) and elemental composition of Ce-Mn conversion coating were studied by energy-dispersive spectroscopy (EDS),respectively.The results showed that the clean surface and well-distributed cathodic points is a necessary step for producing Ce-Mn conversion coating on the surface of Al alloy in following immersion in Ce(NO3)3 and KMnO4 bath.Otherwise,a complete and optimal corrosion resistance conversion coating could not be formed after pretreatment. |
| Key words: aluminium alloy Ce-Mn conversion coating pretreatment corrosion resistance |
