Effect of Chromium and Cobalt Additions on the Corrosion Resistance of Aluminium Silicon Iron Alloy (Al-Si- Fe)
Effect of Chromium and Cobalt Additions on the Corrosion Resistance of Aluminium Silicon Iron Alloy (Al-Si- Fe)
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添加铬和钴对铝硅铁合金（Al-Si-Fe）耐腐蚀性能的影响
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
E. Polycarp
中科院分区：
文献类型：
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作者：
A. Sani;I. Aliyu;E. Polycarp
铝合金是用于汽车、航空航天、包装和建筑的非常重要的材料类别，因为它们具有高机械性能和广泛的工业应用。众所周知，铝合金易于发生微观结构腐蚀（点蚀、晶间腐蚀、均匀腐蚀等）。本文研究了添加铬和钴对铝硅铁合金耐蚀性的影响。将Cr、Co含量在0.1 ~ 0.5%范围内变化，Si、Fe、Zn含量保持不变的合金砂型铸造成20 mm × 250 mm的圆柱形试棒，用失重法研究了铸态和时效硬化态合金在400 ml HCl溶液中室温下480 h的腐蚀特性。所得结果显示，随着Cr和Co的加入，时效硬化样品的耐腐蚀性普遍增加，但腐蚀速率随着铸态和时效硬化样品暴露天数的增加而降低。结果还表明，更稳定的增加的耐腐蚀性为Cr高达0.4%比Co。它还观察到，腐蚀速率下降，随着暴露的天数为所有合金的增加。
Aluminium alloys are very important category of materials used for automotive, aerospace, packaging and construction due to their high mechanical properties and wide range of industrial applications. It is well known that aluminium alloys are prone to microstructural corrosion (pitting corrosion, intergranular corrosion, uniform corrosion, etc.). In this paper, the effect of addition of chromium and cobalt on the corrosion resistance of Al-Si-Fe alloy was studied. Alloying of varying percentages of chromium and cobalt from 0.1 to 0.5% with the percentages of Si, Fe, and Zn kept constant were sand cast into cylindrical test bars of 20 mm by 250 mm. The corrosion characteristics of the as-cast and age-hardened in 400 ml HCl solution at room temperature over period of 480 hrs were deduced by weight loss method. The results obtained revealed a general increase of corrosion resistance with the addition of Cr and Co with the age-hardened samples, but the rate of corrosion decreased with increase in the number of days of exposure for both as-cast and age- hardened samples. The results also indicate more steady increase of corrosion resistance for Cr up to 0.4% than Co. It was also observed that the rate of corrosion decreased with increase in the number of days of exposure for all the alloys.