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采用铸造-拉拔的方法研究了以铋、锡和铝代替铅的环保黄铜棒。利用光学显微镜、扫描电镜等方法研究了含铋黄铜的微观组织和脱锌后组织,对其力学性能、摩擦系数和切削性能进行了研究。结果表明:Bi和Pb以独立的第三相存在于α相和α相界处;Sn固溶于基体中,强化了晶界,改善了Bi的形状,并且阻滞了α相,与Cu、O等元素构成了致密的保护膜,从而阻止了基体Zn的溶解,提高了含铋黄铜的耐蚀性。
An environmentally friendly brass rod with lead, bismuth, tin and aluminum was studied using a cast-pull method. The microstructure of bismuth-containing brass and the structure after dezincification were studied by means of optical microscope and scanning electron microscope. The mechanical properties, friction coefficient and cutting performance were studied. The results show that Bi and Pb exist in the phase of α phase and α phase as an independent third phase. Solubility of Sn in the matrix strengthens the grain boundary, improves the shape of Bi, blocks the α phase, O and other elements constitute a dense protective film, thus preventing the dissolution of the matrix Zn and improve the corrosion resistance of bismuth-containing brass.