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通过设置一对电极,在粉末法渗铝过程中对置于两极间的45钢试样与渗剂施加交流电场,进行交流电场增强粉末法渗铝。通过对渗铝层的生长、组织与相结构特性的观察分析,研究交流电场对45钢粉末法渗铝的影响。结果表明:施加适当的交流电场可以显著促进渗铝过程,促渗作用随电场电流增加而增加;在仅含2%铝粉的渗铝剂中进行电场电流为2 A、保温4 h的渗铝,在500℃即可形成约40μm的渗铝层,在800℃时形成厚约180μm的渗铝层;交流电场能够降低渗铝层表层的含铝量,避免表层形成硬脆富铝相;交流电场粉末法渗铝层在900℃时具有优良的抗氧化性能。分析认为,交流电场的促渗作用与电场对渗铝过程中试样内的扩散、渗剂中的反应与扩散及渗罐内的实际温度等的影响有关。
By setting a pair of electrodes, the 45 steel sample placed between the two poles and the penetration agent were applied AC electric field during the powder aluminizing process to carry out AC electric field enhanced powder aluminizing. Through the analysis of the growth, microstructure and phase structure of the aluminized layer, the influence of AC electric field on the aluminizing of 45 steel powder was studied. The results show that aluminum penetration can be significantly promoted by applying appropriate AC electric field, and the penetration enhancement increases with the increase of electric field current. In aluminum aluminate containing only 2% aluminum powder, the aluminum current of 2 A and holding time of 4 h , Aluminized layer of about 40μm can be formed at 500 ℃ and aluminized layer of about 180μm thick at 800 ℃; AC electric field can reduce the content of aluminum in the surface layer of aluminized layer, avoid the formation of hard and brittle and rich aluminum phase in the surface layer; Electric field powder aluminized layer at 900 ℃ with excellent oxidation resistance. The analysis shows that the enhancement of AC electric field is related to the influence of electric field on the diffusion in the sample during aluminizing, the reaction and diffusion in the penetration agent and the actual temperature in the infiltration tank.