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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Coarse Second-Phase Particles on Galvanic Corrosion of Anodized 6061 Aluminum Alloy Coupled with C1100 Copper
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Effect of Coarse Second-Phase Particles on Galvanic Corrosion of Anodized 6061 Aluminum Alloy Coupled with C1100 Copper

机译：粗大的第二相颗粒对阳极氧化6061铝合金与C1100铜的电偶腐蚀的影响

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摘要

This study investigated the effect of second-phase particles on the galvanic corrosion of anodized 6061aluminum alloys coupled with C1100 copper alloys. The AA6061 alloys were solution treated at 530570 C for 1 h, followed by water quenching or furnace cooling. Anodic coatings of thicknesses 1, 5,and 12 m were formed on AA6061-T6 after anodizing. The galvanic corrosion current of AA6061coupled with C1100 copper was measured using a zero-resistance ammeter for 8 h in two solutions,namely 3.5 wt.% NaCl and 1.0 wt.% NaClO, at 25, 40, and 60 C. Black Mg2Si particles measuring3 and white Al-Fe-Si-Cu particles measuring 3 were observed in the furnace-cooled2 AA6061 specimens. The highest galvanic corrosion current density (1312 /cm ) in a flowingNaClO electrolyte was observed at 60 C for the free-anodized AA6061-T6 alloy coupled with C11002 copper. The lowest galvanic corrosion current density (15 /cm ) was observed in a 12-m-thickanodic coating on AA6061-T6 alloy coupled with C1100 copper in a static 3.5 wt.% NaCl electrolyteat 25 C. A severe corrosion attack was observed for a thin and nonuniform anodic coating on AA6061alloy coupled with C1100 copper after the galvanic corrosion test because the coarse second-phaseparticles in the thin anodic coating on AA6061 caused perforations in the anodic coating. However, thethick anodic coating on AA6061 can effectively reduce the galvanic corrosion of AA6061-T6 coupledwith C1100 copper in static or flowing electrolyte solutions.
机译：本研究调查了第二相颗粒对阳极氧化6061铝合金与C1100铜合金电偶腐蚀的影响。 AA6061合金在530570 C下固溶处理1 h，然后水淬或炉冷。阳极氧化后，在AA6061-T6上形成厚度为1、5和12 m的阳极涂层。使用零电阻电流表在25、40和60°C的两种溶液中（分别为3.5 wt。％NaCl和1.0 wt。％NaClO）在零电阻电流表中测量AA6061与C1100铜的电偶腐蚀电流8小时。黑色Mg2Si颗粒测量3在炉冷的2个A6061样品中观察到3个白色的Al-Fe-Si-Cu颗粒。对于60℃的游离阳极化AA6061-T6合金与C11002铜耦合，在流动的NaClO电解质中观察到最高的电偶腐蚀电流密度（1312 / cm）。在AA6061-T6合金与C1100铜在静态3.5 wt。％NaCl电解质中于25°C的条件下，在12 m厚的阳极氧化涂层中观察到最低的电偶腐蚀电流密度（15 / cm）。在电腐蚀试验后，AA6061合金上的薄且不均匀的阳极涂层与C1100铜结合，因为A6061上的阳极薄涂层中的粗大第二相颗粒导致了阳极涂层的穿孔。然而，AA6061上的厚阳极涂层可以有效地降低A6061-T6与C1100铜在静态或流动电解液中的电偶腐蚀。

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