摘要
将Q235钢在450℃的Zn-Ni-Ti合金中热浸镀0.5~5 min,研究了锌池中添加0.03%~0.06%Ni和0.02%~0.04%Ti对含硅结构钢热浸镀锌层组织的影响。并通过电化学方法测试了Zn-Ni-Ti合金及其镀层在10%Na Cl溶液中的耐蚀性。研究发现,锌池中同时添加0.03%~0.05%Ni和0.02%~0.03%Ti可有效抑制Q235钢热浸镀锌时的硅反应性,合金层厚度明显减薄,其生长主要受扩散控制。而且不会形成大量的三元化合物渣滓。实验证实,添加微量Ni和Ti后,提高了锌合金及其镀层的耐蚀性。但当添加0.05%Ni＋0.04%Ti时,镀层表面质量下降,还会形成较多的溶解了约1.0%Ni的Zn-Fe-Ti三元化合物。
Effects of addition of 0. 03% ~ 0. 06% Ni and 0. 02% ~ 0. 04% Ti into the zinc bath on microstructure of galvanizing Sicontaining steel were investigated. Q235 steel was immersed in the Zn-Ni-Ti alloys for 0. 5-5 min. The corrosion resistance of Zn-Ni-Ti alloys and coatings in 10% Na Cl solution was examined by electrochemical method. Experiment results show that the addition of 0. 03%-0. 05% Ni and 0. 02%-0. 03% Ti can exhibit insignificant effect on Si reactivity of Q235 steel. The thickness of the alloy layer decreases obviously. And the growth of the alloy layer changes to be controlled by diffusion. Besides,only small amount of Zn-Fe-Ti ternary compound forms in the coating. Electrochemical tests show that addition of 0. 05% Ni and 0. 03% Ti can improve the corrosion resistance of the zinc alloys and coatings. However,after adding 0. 05% Ni ＋ 0. 04% Ti,the coating surface quality will become terrible and much more amount of the Zn-Fe-Ti ternary compound dissolving 1. 0% Ni formed in the coating.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第9期156-160,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51271040
51201023)
江苏高校优势学科建设工程资助项目
溧阳市科技计划项目(ly2012PT01)
关键词
热浸镀锌
硅反应性
合金元素
耐蚀性
hot-dip galvanizing
silicon reactivity
alloying element
corrosion resistance
