以WC-10(CoNi)合金为基础,在粘结剂中加入不同含量的Cr,对合金的力学性能以及腐蚀性能进行了试验研究.试验结果表明,合金的抗弯强度随着Cr添加量的增加而降低,而硬度随着Cr添加量的增加而升高.在浸泡腐蚀试验中,添加Cr后就会使合金的耐腐蚀能力显著增强.在冲刷腐蚀试验中,各试样在冲蚀角度为60°时有最大腐蚀速率:当旋转圆盘的转速达到1000r/min以上时,合金的腐蚀速率显著增加,力学协同破坏的影响开始明显表现出来.通过对冲刷腐蚀后的合金试样表面及断面进行SEM观察,含Cr合金在腐蚀液中形成的钝化膜更加完整、致密,和基体金属的结合力也更强.

The mechanical properties and corrosion resistance of the WC-based alloy containing different quantities of Cr in the binder were studied.The bending strength of the alloy decreased but hardness increased with increasing Cr addition.The corrosion resistance was greatly improved with increasing Cr addition.In the erosion-corrosion experiments,the maximum corrosion rates of various alloys with different components were all observed at the impact angle of 60°.When the rotational speed of the rotating disc reached 1000rpm,the corrosion rate of the alloy increased suddenly,and the effect of mechanical synergism occurred obviously. Through the SEM observation of the alloy section and surfaces corroded,it was found that the passive film of WC-based cemented carbide with Cr addition was more integrated and it had stronger binding force with the substrates than that of the alloy without Cr addition.