摘要
目前,对航空300M超高强度结构钢电镀Zn-Ni合金的氢脆性能研究鲜见报道。采用正交试验法研究了工艺参数对300M钢Zn-Ni合金镀层含Ni量和氢脆性能的影响规律;采用EDA能谱分析、SEM形貌观察、缺口拉伸试验和断口分析等方法,对Zn-Ni合金镀层的氢脆性能和断口特征进行了分析研究,探讨了其代替松孔镀镉层的可行性。结果表明:从工程应用安全性出发的氯化物-硫酸盐体系Zn-Ni合金电镀优化工艺条件为镀液Ni2+/Zn2+质量浓度比0.53、温度30℃、电流密度4 A/dm2,所得镀层的氢脆敏感性低,符合航空工业高强度钢氢脆性能要求,可以代替剧毒镀镉工艺用于航空结构钢的表面防护处理。
Orthogonal tests were conducted to investigate the effects of electroplating parameters on the Ni content and hydrogen embrittlement of Zn-Ni alloy coatings on 300 M high strength aviation structural steel.The hydrogen embrittlement and cross-section features of Zn-Ni alloy coatings were studied based on energy dispersive spectrometric analysis,hydrogen-induced hysteretic fracture analysis,and cross-sectional scanning electron microscopic observation,and the feasibility for Zn-Ni alloy coating to replace electroplated porous Cd coating was examined.Results indicated that,in view of the safety in engineering application,the optimal parameters for Zn-Ni alloy electroplating in chloride-sulfate system were suggested as Ni^(2+)/Zn^(2+) concentration ratio of 0.53,temperature of 30 ℃,and cathodic current density of 4 A/dm^2.The Zn-Ni alloy coating obtained under the optimal electroplating parameters exhibited low hydrogen embrittlement sensitivity,and its hydrogen embrittlement was acceptable in terms of the requirement for the hydrogen embrittlement of high strength structural steels used in aviation industry.
出处
《材料保护》
CAS
CSCD
北大核心
2014年第6期5-8,共4页
Materials Protection
