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钢基热浸镀锌铝合金的研究 总被引:1,自引:0,他引:1
为进一步提高镀锌层质量和耐腐蚀能力,通过在传统热浸镀锌中添加少量铝,获得了钢基热镀锌铝合金层。研究了钢基热浸镀锌铝合金镀过程中,助镀剂的组成,镀液温度、浸镀时间、钢基硅含量等因素对镀层厚度的影响,获得了一种耐腐蚀性好,结合力强和光滑的热镀锌铝合金层,该锌铝合金镀层与镀锌层相比,在二氧化硫气氛中的耐腐蚀能力有很大的提高。 相似文献
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热浸镀锌液中添加合金元素,将对镀层厚度、显微组织、耐蚀性和外观质量等产生重要的影响.本文重点介绍了含有Ni、Mg、Ti、Mn、Bi 5种合金镀层技术,探讨了这几种合金元素对热浸镀层组织、性能的影响,并展望了其发展趋势. 相似文献
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热浸镀锌合金镀层的研究进展 总被引:4,自引:0,他引:4
热浸镀锌液中添加合金元素,将对镀层厚度、显微组织、耐蚀性和外观质量等产生重要的影响.重点介绍了含有镍、镬、钛、锰、铋的5种合金镀层技术,探讨了这几种合金元素对热浸镀层组织、性能的影响,并展望了其前景. 相似文献
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波形梁护栏热浸镀锌工艺河南省驻马店市热浸镀铝厂(463000)苗立贤河南省驻马店市材料保护研究所牛继英随着我国高速公路建设的飞速发展,用于防止汽车翻车、冲出公路的波形梁护栏用量很大。波形梁护栏应具有较高的强度、良好的耐腐蚀性能,耐磨性及对光(热)的低... 相似文献
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为解决热镀锌过程中常出现的边部过镀锌缺陷,利用数值模拟方法对热镀锌气刀射流喷吹过程进行仿真研究,分析了挡板厚度对带钢边部压力场的影响;并借助镀层厚度计算模型,计算挡板厚度和边部角度对镀层厚度的作用关系;同时通过不同拉钢速度、气刀狭缝总压等工况,对挡板的厚度及边部角度进行优化.结果表明:随挡板厚度减小,带钢边部作用力增大并逐渐接近中心处;带钢边部镀层厚度随挡板厚度的减小而变薄,随挡板边部角度的增加而先减小后增大;挡板厚度2 mm、边部角度90°时,能有效提高带钢横向作用力和镀层分布的均匀性. 相似文献
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主要从设备和工艺方面分析了镀锌带钢卷取塔形产生的原因。通过调整皮带助卷器各导辊(主要是弧形辊)来保证皮带运行轨迹,从而保证带钢穿带时两侧张力均匀,避免形成塔形。卷取区设备维护等方面进行改进后,卷取塔形问题也有了很大改善。 相似文献
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低碳钢热浸Zn-0.15%Ni合金镀层组织及第二相粒子 总被引:1,自引:0,他引:1
采用热浸Zn-Ni合金镀锌方法,在含0.03%-0.36%Si的低碳钢上获得Zn-Ni合金镀层,研究了镀浴中Ni含量和钢中Si含量对镀层中δ相和ζ相生长速率的影响,以及Zn-Ni合金镀层η相中的第二相粒子即Zn-Fe-Ni三元化合物Γ2相粒子的形成和长大过程,结果表明,在Zn-0.15%Ni镀浴中,含硅0.03%-0.215%钢镀层的ζ相明显受到抑制,δ相厚度略有增加,Γ2相粒子的形成和长大过程包括ζ相的溶解,Γ2相的形核和成比例吸收铁,镍而长大。 相似文献
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《Materials Science & Technology》2013,29(2):251-256
AbstractDuring hot dip galvanising, the metal strip passes into the zinc bath at a temperature of ~460°C. Iron from the strip dissolves into the bath during this operation, leading to problems such as dross formation and pickup. The model described in the present paper has been created in an attempt to quantify and understand the amount of iron dissolving from the strip as it passes through the zinc bath. This is a mathematical model based on well defined first principles of nucleation, growth and diffusion. The effect of process parameters on the amount of iron dissolving from the strip has been analysed, showing possible actions that may help to reduce the amount of dissolution. 相似文献
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为提高汽车用热镀锌钢板的可焊性,将热镀锌钢板进行合金化退火处理,采用电子显微镜、X射线衍射分析和结合力测试等试验手段,研究了不同时间合金化处理后热镀锌层的表面形貌、化学成分及热镀锌层与基体结合力的变化规律.结果表明:与原始镀锌层为单相Zn以及含有少量Fe相比,经合金化处理后,除了有Zn O和Zn O2相形成之外,同时出现了Zn-Fe金属间化合物;随着合金化处理时间的延长,镀锌层中的Fe含量以及Zn-Fe金属间化合物的Fe含量不断增加;与原始镀锌层和基体的结合力相比,经合金化处理后,镀锌层与基体的结合力增加,并随处理时间的延长,其镀锌层结合力不断提高. 相似文献
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S. Srikanth C. B. Sharma A. Bhattacharyya Amitava Ray 《Journal of Failure Analysis and Prevention》2005,5(3):73-81
Continuously processed hot dip galvanized steel sheets that exhibited bare spots, exfoliation/peel-off, and matte coating
appearance were investigated to gain an insight into the genesis of such defects. Scanning electron microscopy coupled with
energy-dispersive X-ray spectrometry (SEM/EDS) and electron probe microanalysis (EPMA) were employed in conjunction with analysis
of the galvanizing bath. Analyses revealed a bath condition sensitive to surface cleanliness of the steel substrate and showed
significant levels of carbonaceous residues and rolling debris on the annealed steel substrates. This improper steel surface
condition has been attributed to excess oil carry-over on the cold rolled strip surface and poor burnoff in the annealing
furnace. 相似文献
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Corrosion behaviour of hot dip zinc and zinc-aluminium coatings on steel in seawater 总被引:7,自引:0,他引:7
Yan Li 《Bulletin of Materials Science》2001,24(4):355-360
A comparative investigation of hot dip Zn-25Al alloy, Zn-55Al-Si and Zn coatings on steel was performed with attention to
their corrosion performance in seawater. The results of 2-year exposure testing of these at Zhoushan test site are reported
here. In tidal and immersion environments, Zn-25Al alloy coating is several times more durable than zinc coating of double
thickness. At long exposure times, corrosion rate for the Zn-25Al alloy coating remains indistinguishable from that for the
Zn-55Al-Si coating of similar thickness in tidal zone, and is two to three times lower than the latter in immersion zone.
The decrease in tensile strength suggested that galvanized and Zn-55Al-Si coated steel suffer intense pitting corrosion in
immersion zone. The electrochemical tests showed that all these coatings provide cathodic protection to the substrate metal;
the galvanic potentials are equal to −1,050, −1,025 and −880 mV (SCE) for zinc, Zn-25Al alloy and Zn-55Al-Si coating, respectively,
which are adequate to keep the steel inside the immunity region. It is believed that the superior performance of the Zn-25Al
alloy coating is due to its optimal combination of the uniform corrosion resistance and pitting corrosion resistance. The
inferior corrosion performance by comparison of the Zn coating mainly results from its larger dissolution rate, while the
failure of the Zn-55Al-Si coating is probably related to its higher susceptibility to pitting corrosion in seawater. 相似文献
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The fine structure in the Fe-Al alloy layer of a new hot dip aluminized steel (HDA) was examined by means of X-ray diffractometry
(XRD), electron diffraction technique, etc. The test results indicated that the Fe-Al alloy layer of the new aluminized steel
mainly composed of Fe3Al, FeAl and α-Fe (Al) solid solution. There was no brittle phase containing higher aluminum content, such as FeAl3 (59.18% Al) and Fe2Al7 (62–93% Al). The tiny cracks and embrittlement, formerly caused by these brittle phases in the conventional
aluminum-coated steel, were effectively eliminated. There was no microscopic defect (such as tiny cracks, pores or loose layer)
in the coating. This is favourable to resist high temperature oxidation and corrosion of the aluminized steel. 相似文献