典型高强紧固件海南雨水环境腐蚀及防护研究
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摘要
通过高强结构紧固件海南雨水浸泡(168 h)实验和海南淋雨大气环境暴露(480 h)实验,获取了30CrMnSiA、30CrMnSiNi2A、GH4169和Ti-6Al-4V材料的高强结构紧固件的南海雨水腐蚀数据,验证了不同表面处理措施和醇酸清漆等表面防护涂层对紧固件的保护效果。结果表明:GH4169和Ti-6Al-4V材料在海南雨水环境下有较强的耐蚀性;flZnAl12表面处理能够满足30CrMnSiNi2A紧固件的防护要求;Fe/Ep.Zn7.c2C和flZnAl12表面处理可在一定程度上提高30CrMnSiA紧固件耐蚀性,但仍不能避免点蚀发生,紧固件外部涂覆醇酸清漆对产品有很好的保护效果。
The corrosion data of high-strength fasteners made of 30CrMnSiA, 30CrMnSiNi2A,GH4169 and Ti-6Al-4V were acquired by means of immersion(168 h) test in simulated rain-water of Hainan island and field exposure in marine atmosphere in a side within 1 km from the coastline at Hainan. The protection effectiveness of different surface treatments and coating methods on high-strength fasteners was also verified. Results show that GH4169 and Ti-6Al-4V present high corrosion resistance, and the surface treatment of flZnAl12 can meet the corrosion protection requirement for 30CrMnSiNi2A fasteners. Treatments of Fe/Ep.Zn7.c2C and flZnAl12 can enhance the corrosion resistance of 30CrMnSiNi2A fasteners to a certain extent, while pitting corrosion cannot avoid; and alkyd resin varnish coating has good protection effect.
The corrosion data of high-strength fasteners made of 30CrMnSiA, 30CrMnSiNi2A,GH4169 and Ti-6Al-4V were acquired by means of immersion(168 h) test in simulated rain-water of Hainan island and field exposure in marine atmosphere in a side within 1 km from the coastline at Hainan. The protection effectiveness of different surface treatments and coating methods on high-strength fasteners was also verified. Results show that GH4169 and Ti-6Al-4V present high corrosion resistance, and the surface treatment of flZnAl12 can meet the corrosion protection requirement for 30CrMnSiNi2A fasteners. Treatments of Fe/Ep.Zn7.c2C and flZnAl12 can enhance the corrosion resistance of 30CrMnSiNi2A fasteners to a certain extent, while pitting corrosion cannot avoid; and alkyd resin varnish coating has good protection effect.
引文
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[3]Sun Z D,Wang X L.Corrosion prevention improvement on the area of frequently dismounting steel fastener[J].Equip.Environ.Eng.,2015,12(6):109(孙祚东,王小龙.经常拆装钢紧固件区域腐蚀防护改进[J].装备环境工程,2015,12(6):109)
[4]Jha A K,Manwatkar S,Sreekumar K.Hydrogen-induced intergranular stress corrosion cracking(HI-IGSCC)of 0.35C-3.5Ni-1.5Cr-0.5Mo steel fastener[J].Eng.Failure Anal.,2010,17:777
[5]Cao H T,Li X T.Corrosion protection requirements and technical measures of fasteners based on the marine environment[J].Surface Technol.,2013,42(1):10(曹宏涛,李雪亭.基于海洋环境的紧固件腐蚀防护要求及技术措施[J].表面技术,2013,42(1):105)
[6]Cao W J,Tang Z H,Yuan L,et al.Behaviour of galvanic corrosion resistance of aluminum coating on titanium alloy fastener[J].Equip.Environ.Eng.,2016,13(1):116(曹文健,汤智慧,原玲等.钛合金紧固件用铝涂层抗电偶腐蚀行为研究[J].装备环境工程,2016,13(1):116)
[7]Harrison T J,Crawford B R,Brandt M,et al.Modelling the effects of intergranular corrosion around a fastener hole in 7075-T651 aluminium alloy[J].Comput.Mater.Sci.,2014,84:74
[8]Le M,Kim J,Kim S,et al.Nondestructive evaluation algorithm of fatigue cracks and far-side corrosion around a rivet fastener in multi-layered structures[J].J.Mech.Sci.Technol.,2016,30:4205
[9]Nanninga N,Grochowsi J,Heldt L,et al.Role of microstructure,composition and hardness in resisting hydrogen embrittlement of fastener grade steels[J].Corros.Sci.,2010,52:1237
[10]Carter A E,Hanagud S.Stress corrosion susceptibility of stresscoined fastener holes in aircraft structures[J].AIAA J.,1975,13:858