热浸Zn-Sn-Ni合金镀层的显微组织及耐蚀性能

采用SEM、极化曲线和XRD研究了在锌浴中添加Sn、Ni元素后含0.36％ Si钢热浸镀锌合金镀层的组织及耐蚀性能的变化.结果表明:Zn-Sn-Ni合金浴法能够有效抑制含硅活性钢镀层的快速生长,获得厚度适宜、组织致密的镀层.Zn-Ni-Sn合金镀层在5％NaC1溶液中发生自发腐蚀的倾向小于Zn镀层,其极化电阻增大,腐蚀...     

锌镍合金镀层厚度的研究

用Q235钢研究了锌镍合金中镍含量对热浸镀锌层厚度的影响。试验结果表明:当锌浴中w(Ni)<0.12％时,镀层厚度随镍含量增加而减薄;当w(Ni)>0.12％时,镀层厚度有随镍含量增加而增加的趋势。由于锌浴中加入了镍,锌镍合金镀层明显地薄于纯锌镀层。随着浸镀时间的增长,锌镍合金镀层厚度是以某一抛物线趋势增加,纯锌镀层则呈直线增加。     

S550GD+AZ在薄壁轻钢装配式建筑中耐蚀性的研究

对相同镀层厚度的热浸镀锌钢S550GD+Z和热浸镀铝锌钢S550GD+AZ进行中性盐雾试验对比和断面SEM分析研究。结果表明,热浸镀铝锌钢的耐蚀性远高于热浸镀锌钢,建议在薄壁轻钢装配式建筑中采用热浸镀铝锌钢。     

热镀锌钢板生产概述：——第三讲 影响镀层结构的因素

钢铁的热浸镀锌是一个物理化学反应过程,热浸镀锌产品热量与钢板的原始状态及锌液中的化学成分有着密切的关系。系统地介绍了镀锌温度、浸镀时间、钢中的化学成分及锌液中的其它微量元素对镀层结构的影响。     

锌液成分对镀层质量影响的分析研究

介绍了锌液中各种元素对热浸镀锌锌层质量的影响，并具体分析了对应这些元素含量的变化热浸镀锌锌层质量的改变。     

电镀锌、热浸锌钢管耐腐蚀性能对比试验研究

一、前言电镀锌、热浸镀锌是镀锌薄壁钢管镀锌层所采用的主要工艺方法。电镀锌是电化学过程,通过电镀在钢管表面沉积出锌镀层。热浸镀锌是将钢管放在熔融的锌锅中(460°～480°c),经一定时间取出,通过两种金属熔融状态下互相溶解,在钢管表面形成锌镀层。这两种工艺,方法不同,原理也各不相同。热浸镀锌由于能获得较厚的镀层(0.06～0.10毫米),故普     

Fe-x%Mn/Super Dyma扩散偶中Fe-Al合金层的生长行为

Super Dyma锌铝镁硅合金镀层具有优良的耐腐蚀性能,在热浸镀锌工业中备受关注。为弄清锰元素对热浸镀Super Dyma合金镀层组织的影响,将Fe-x%Mn/Super Dyma固-液扩散偶在500, 550, 600和650℃分别进行10, 15, 20, 25和30 min的扩散退火,采用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)等仪器研究了该扩散偶中合金层的相组成及其生长规律。研究结果表明:Fe-x%Mn/Super Dyma固-液扩散偶中的合金层由Fe_2Al_5相和FeAl_3相组成, Fe-Al合金层呈现抛物线生长规律,其生长受铁和铝原子扩散控制;随着扩散反应温度的提高, Fe-Al合金层的厚度明显增加;铁基合金中的锰元素具有抑制Fe-x%Mn/Super Dyma固-液扩散偶中Fe-Al合金层生长的作用,当锰含量为0.9%(质量分数)时,锰元素对扩散偶中Fe-Al合金层生长的抑制作用最明显。在热浸镀Super Dyma合金镀层时,最佳热浸镀温度温度为550～600℃。为得到合适的镀层厚度,可依据热浸镀温度确定合适的热浸镀时间和钢中的锰含量。     

锌镍合金的研制及在含硅活性钢热镀锌领域的应用

研究了镍在锌液中的溶解规律及无芯电炉熔炼锌镍合金的工艺条件。开发了使用海绵镍配制锌镍合金产品的专利工艺,并进行了大规模生产。锌镍合金用于热浸镀锌,能很好地解决含硅活性钢热浸镀时的圣德林效应。     

锌镍合金的研制及在含硅活性钢热镀锌领域的应用

研究了镍在锌液中的溶解规律及无芯电炉熔炼锌镍合金的工艺条件。开发了使用海绵镍配制锌镍合金产品的专利工艺，并进行了大规模生产。锌镍合金用于热浸镀锌，能很好地解决含硅活性钢热浸镀时的圣德林效应。     

板带钢热浸镀锌铝镁技术的研究进展

热浸镀是一种经济、高效的钢铁材料表面处理技术，其产品在钢材的防腐蚀、延长使用寿命和节能等方面起到十分重要的作用。随着科学技术的发展以及人类社会的进步，耐腐蚀性更高、经济性能更好的新型合金镀锌层、复合镀层成为研究和开发的重点。镀液中加入适量的Mg和Al元素后材料耐腐蚀性和耐损伤性更好，因此热浸镀锌铝镁技术得到广泛应用。分析了热浸镀锌技术的发展历程，总结了近几年锌铝镁镀层的成分和组织特征，阐述了镀锌过程中镀层的组织演变和凝固机制。对钢板表面与镀液之间的润湿性、界面反应和合金元素在界面层的扩散行为进行了分析，对热浸镀锌铝镁板的耐腐蚀性进行了总结，从而期望加快推进热浸镀锌铝镁技术在汽车等行业中的发展和应用。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.