稀土铈对冷凝管用锡黄铜组织及性能的影响

分析了稀土铈含量对锡黄铜合金组织的影响,采用拉伸试验研究了添加稀土铈后合金的性能变化, 利用腐蚀试验和电化学试验研究了稀土铈的添加和含量变化对合金耐蚀性能的影响.研究表明,添加适量的稀土铈和微量的硼明显改善了合金的组织,提高了材料的延伸性和耐蚀性.添加稀土铈元素在腐蚀的时候能使腐蚀表面形成致密的保护膜,从而提高合金的耐蚀性能,但是过量的稀土容易富集形成富稀土相,使合金的热塑性变差,难以加工.

Influence of Rare Earth Cerium on Properties of HSn70-1 Tin Brass Used for Condenser Tube

Effect of rare earth (RE) cerium on the structure of alloy was analyzed, the performance of alloy containing Ce was investigated by tensile test, and the influences of Ce with different content on the corrosion resistance of alloy were studied by corrosion test and electrochemical test. It indicates that the structure of alloy is obviously improved with an amount of Ce and trace boron, and the ductility and corrosion resistance also increase. Cerium can produce tight protective coating on corrosion surface and so improve the corrosion resistance of alloy. But the excessive Ce often aggregates easily to produce the Ce-rich phase, which results in worse thermoplasticity of alloy and hard to process.