| 冷加工对含Mn铝合金管腐蚀行为的影响 |
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| 引用本文： | 王冠,林晓群.冷加工对含Mn铝合金管腐蚀行为的影响[J].金属学报,2011(3). |
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| 作者姓名： | 王冠 林晓群 |
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| 作者单位： | 广东工业大学机电学院;广东交通集团广东省公路建设有限公司; |
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| 摘 要： | 采用SEM,TEM,动电位极化和浸泡实验研究了机械冷加工变形对汽车散热器高Mn(0.22%,质量分数,下同)和低Mn(0.08%)铝合金管在0.6 mol/L NaCl(pH=6)和SWAAT(ASTM G85,pH=3)溶液中的腐蚀行为的影响.电化学极化测试表明,无形变时高Mn铝合金直管的点蚀电位最高;但冷加工能降低高Mn铝合金弯曲表面的点蚀电位,而对低Mn铝合金的点蚀电位没有明显影响.TEM观察发现,冷加工后高Mn铝合金中有大量纳米尺度的富Mn析出相,在低Mn铝合金中却没有观察到这种析出相,阴极极化测试表明,富Mn相能显著促进阴极反应,富Mn相相对Al基体为阴极相,因而是点蚀萌生的部位.添加Mn尽管有利于提高铝合金的耐蚀性,但机械冷加工会弱化这一效应.
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| 关 键 词： | 含Mn铝合金 腐蚀 机械冷弯曲 微观结构 |
EFFECT OF COLD DEFORMATION ON THE CORROSION BEHAVIOUR OF Mn-CONTAINING ALUMINIUM ALLOY TUBE |
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| WANG Guan Institute of Mechatronics,Guangdong University of Technology,Guangzhou LIN Xiaoqun Guangdong Road Construction Co.Ltd,Guangzhou.EFFECT OF COLD DEFORMATION ON THE CORROSION BEHAVIOUR OF Mn-CONTAINING ALUMINIUM ALLOY TUBE[J].Acta Metallurgica Sinica,2011(3). |
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| Authors: | WANG Guan Institute of Mechatronics Guangdong University of Technology Guangzhou LIN Xiaoqun Guangdong Road Construction CoLtd Guangzhou |
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| Affiliation: | WANG Guan Institute of Mechatronics,Guangdong University of Technology,Guangzhou 510006 LIN Xiaoqun Guangdong Road Construction Co.Ltd,Guangzhou 510600 |
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| Abstract: | Aluminium alloys are extensively employed as heat transfer tube materials in heat exchangers.Previous work has focused on the corrosion behaviour of tube materials in brazed heat exchangers.However,very little attention has been devoted to corrosion of tubes in mechanically-expanded heat exchangers despite the observation of some instances of early corrosion failure in bent region of aluminium alloy tube.The effects of cold deformation on the corrosion behaviour of aluminium tube materials have been studied... |
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| Keywords: | Mn-containing aluminium alloy corrosion cold deformation microstructure |
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