用经典失重法和显微结构法研究了20个少量添加元素对纯铝及LY-12母材上Al-Zn钎料焊点抗腐蚀性能的影响。发现添加少量碱土金属或稀土金属能有效地提高焊点的抗腐蚀性。少量重金属Bi,Sn,Pb,Cd,Tl,Cu,Ni及Ga等引起合金强烈的晶间腐蚀。过渡金属及碱金属影响不大。
A study has been made of the effects of twenty metal additions in small amount on the corrosion resistance in 3% NaCl solution of Al-Zn euteetic fillets on pure aluminum as well as on LY12 (2024) base metals as determined by weight loss and by metallographic technique. It is shown that corrosion resistance effectively increses with the addition of small amounts of alkaline earth and rare earth elements, such as Be, Mg, Sr and La. The addition of heavy metals, such as Bi, Sn, Pb, Cd, Tl, Cu, Ni and Ga causes serious intercrystalline corrosion in the fillets. Less effective are the additions of transition metals and alkali metals.
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