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在碱性锌酸盐镀锌基础液中加入自制光亮剂XY-03A,研究成功了一种全光亮碱性锌酸盐镀锌工艺,确定了电镀工艺规范,采用霍尔槽试验探讨了主要成分对镀层质量的影响,检测了镀液和镀层性能,结果表明:所形成的锌镀层光亮度高,镀层结晶细致,与基体结合力好;镀液的分散能力、复盖能力、电流效率和镀层耐蚀性优于DE型镀锌工艺,具有较高的应用价值. 相似文献
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研究碱性锌酸盐体系电镀Zn-Ce合金工艺.对镀液中不同Ce~(3+)含量所获得镀层的耐蚀性作了研究,并以X-射线衍射对Zn-Ce镀层和纯Zn层的结构作了对比分析. 相似文献
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电镀锌镍合金以其优异的耐蚀性能于八十年代投入生产用作钢铁材料的耐蚀保护镀层,特别是在汽车工业中得到广泛应用.锌镍合金电镀液有弱酸性和碱性两种体系,其中碱性体系具有较好的分散能力,镀液腐蚀性弱,废水处理方便,生产成本低等优点,近年来得到迅速发展.碱性电镀锌镍合金中的镍含量大多在5~10Wt%的范围内.本文研究了在碱性体系下的镍含量小于1Wt%的电镀锌镍合金工艺,并获得了光亮的耐蚀性好的锌镍合金镀层. 相似文献
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正交试验优化电镀Zn-Ni-P合金工艺 总被引:4,自引:2,他引:4
选取影响电镀Zn-Ni-P合金的6个工艺参数,设计了125(56)正交试验方案,探讨了镀液组成和电镀制度对Zn-Ni—P合金镀层性能的影响,用极差法分析了各工艺参数对镀层性能影响的显著性并确定了最佳工艺条件。优化验证实验结果表明:该工艺稳定,得到光亮、致密、外观平整的Zn-Ni—P合金镀层,得到的锌镍磷合金镀层的耐蚀性优于锌镍合金,且其耐蚀性随镀层中磷含量的增大而提高。 相似文献
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稀土对电沉积Zn-Fe-La三元合金性能影响的研究 总被引:1,自引:0,他引:1
为了获得更加光亮、致密的Zn-Fe-La三元合金镀层,针对电沉积Zn-Fe-La三元合金镀液组成及工艺条件,系统地研究了稀土对镀层成分含量、镀液稳定性、镀液分散能力以及pH值的影响,测定了镀层的极化曲线、稳定电位和极化电阻,比较了不同稀土含量对镀层耐蚀性的影响.结果表明:稀土的加入可提高镀液稳定性、分散能力,增加电沉积过程阴极极化,使阳极钝化前的活性区腐蚀电位正移,自溶解速度下降,有利于提高镀层耐蚀性,其耐蚀性比Zn-Fe合金镀层及纯Zn镀层有很大提高. 相似文献
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通过在钢基体表面制备涂层可以很好地延长钢铁材料的服役时间,减少因腐蚀造成的重大事故和人员伤亡。相较于传统的纯Zn涂层、纯Al涂层以及Zn-Al合金涂层,Zn-Al伪合金涂层能够为基体材料提供长久有效的腐蚀防护,在钢铁材料的腐蚀防护中具有巨大的应用潜力。简述了Zn-Al伪合金涂层电弧喷涂制备工艺的特点;介绍了Zn、Al、Zn-Al合金及Zn-Al伪合金涂层在模拟海洋环境下的腐蚀防护原理;在此基础上从组分、喷涂工艺参数(喷涂距离、喷涂电流和喷涂电压)、元素掺杂(Mg、Si及Re)及后处理工艺(封孔、激光重熔)等角度,论述了其对Zn-Al伪合金涂层耐蚀性的影响;讨论了Zn-Al伪合金涂层防腐体系在桥梁、海洋钢结构件、地下运输管道中的应用现状;最后总结了目前研究工作中存在的挑战,提出了电弧喷涂Zn-Al伪合金涂层尚需深入研究的重点问题,为提高钢铁材料使用寿命提供了参考。 相似文献
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The corrosion of rebar is one of the primary causes of premature deterioration of the concrete structure. The ideal option to overcome this situation would be to provide corrosion protection right at the time of manufacturing of the rebar before it is encased in the concrete and hence, warrants the use of corrosion resistance rebar.The present paper outlines characterisation of coating obtained on rebar surface from pure Zn and Zn-4.9Al-0.1 misch metal bath. The coating was characterised by SEM, EDS, Galvanostatic and XRD techniques. In case of pure Zn bath, distinct phases such as eta, zeta, delta and gamma 1 and gamma were identified in coating where as in case of Zn-4.9Al-0.1 misch metal bath no such distinctive phases were found. The coating obtained from Zn-4.9Al-0.1 misch metal bath was thinner and consisted of outer Al2O3 phase followed Zn-Al phase resulting in better ductility compare to the coating obtained from pure Zn bath. Comparative corrosion resistance performances of both types of coating respect to uncoated rebar were evaluated by salt spray and tafel test. were conducted in simulated aggressive chloride and concrete pore solution of coated and The coating obtained form Zn-4.9Al-0.1 misch metal bath was found to be more anodic and showed 1.5-3 times better corrosion resistance in concrete pore solution and 2.5 times better resistance against aggressive chloride attack compare to the coating obtained from pure Zn bath. Both the coatings dissolved in faster rate in highly alkaline environment (pH = 13.6) where as dissolution rate decreased with decrease of pH in pore solution. The sacrificial as well as barrier protection of Zn-Al alloy coating was found to be more effective than pure Zn coating. Both types of coated bars showed reduction in bond strength in concrete structure. It is attributed by the faster dissolution of the coating, leading to hydrogen gas evolution thereby creating a gap between the rebar surface and concrete structure. 相似文献
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Electrochemical corrosion behavior of arc sprayed Zn-Al coatings 总被引:2,自引:0,他引:2
Cored wires and high velocity arc spraying (HVAS) technique were applied to produce high Al content Zn-Al alloy coatings on low carbon steel substrates. The electrochemical corrosion behaviors of Zn, Al and Zn-Al coatings were studied with potentiodynamic measurement in 5 % NaCl solution. Compared with pure Zn, pure Al and Zn-15Al coatings, Zn-26Al coatings show a higher corrosion resistance in salt solution. The potentiodynamic polarization tests show that the corrosion resistance of Zn-Al coatings increases as Al content is raised. Pure Al coating exhibits different electrochemical behaviors with other coatings. The corrosion initiated at the micro-pores of the coating and the underlying corrosion mechanism is very similar to that of the pitting corrosion. 相似文献
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甲基磺酸盐镀液体系可焊性合金镀层的工艺 总被引:3,自引:0,他引:3
研究了一种新型可焊性镀层-含银量3%的锡银合金的电镀工艺,选择甲基磺酸亚锡和甲基磺酸银为主盐,柠檬酸钠、碘化钾和三乙醇胺为络合剂,研制了镀覆含银量为3%的最佳镀液配方和施镀工艺条件.通过对镀层可焊性、抗高温氧化性能和表面接触电阻等性能的考察发现,低含银量的锡银合金镀层性能优于锡铅合金镀层,且镀液成分简单、性能稳定、无毒无害,具有广泛的应用前景. 相似文献
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目前,热喷涂Zn—Al合金涂层已替代Zn及Al涂层,成为海洋环境下钢结构件腐蚀防护的首选方法。使用高速电弧喷涂和粉芯丝材技术制备了Zn—Al涂层,采用电化学阻抗谱法(EIS),结合涂层腐蚀产物X-射线衍射(XRD)及涂层腐蚀后表面形貌分析,对比研究了Zn及Zn—Al涂层的耐蚀性,并探讨了涂层的自封闭机理。结果表明,活化溶解是Zn涂层腐蚀的主要机制,在腐蚀过程中Zn涂层表现出自封闭作用,但由于腐蚀产物是疏松的,其自封闭效果微弱;Zn—Al涂层表现出了更好的耐蚀性,涂层表现出一定的自封闭效果。 相似文献
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Zn-Al系列高速电弧喷涂层电化学防腐性能研究 总被引:6,自引:3,他引:6
采用粉芯丝材和高速电弧喷涂技术制备高Al含量的Zn-26%Al涂层。通过电化学的方法测试涂层在5%NaCl溶液下的腐蚀行为,并与由实芯丝材纯Zn、纯Al及Zn-15%A1所制备的涂层作比较。结果表明:Zn-26%A1涂层在电解质溶液中表现出更优越的防腐性能。动电位极化测试结果说明zn-Al涂层随着Al含量的增加,其耐蚀性也提高。纯Al涂层的电化学腐蚀行为与其它涂层有明显差异,其腐蚀机理类似于点蚀。 相似文献