摘要
通过激光熔覆工艺在H13钢表面制备了SiC_p/Ni35,Ni@SiC_p/Ni35和Cu@SiC_p/Ni35复合覆层。对3种激光熔覆层在700℃进行2h铝液静态热熔损试验,测量试样的熔损质量。采用SEM-EDS观察和分析熔覆层的组织和成分,分析并研究SiC_p/Ni35熔覆层在铝液中的腐蚀机理。结果表明,H13钢的熔损质量损失为熔覆层质量损失的16~23倍,各熔覆层熔损质量差别不大。熔覆层Al/Ni接触扩散偶新生相形核时间长,Al在熔覆层中扩散速度低导致熔覆层抵抗铝热熔损性能显著提高。
The SiCp/Ni35,Ni@SiCp/Ni35 and Cu@SiC,/Ni35 composite coatings on H13 steel were prepared by laser cladding. Three kinds of coatings were immersed in molten aluminum for 2 h at 700 C to measure the melting losses of samples. The microstructure and phase constituent of corroded coatings were observed by SEM and EDS. The corrosion mechanism of the coating in molten aluminum was described. The results show that the melting loss of H13 steel is 16-23 times of that of three kinds of coatings, and the loss weight of the three coatings exhibits absence of apparent difference, which are attributed to the long nucleation time of new phase in Al/Ni contact diffusion couple and the low diffusion velocity of Al resulting in high anti-corrosion resistance of coating in molten aluminum.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2018年第1期1-4,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51375353)
