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pH对低温镀铁组织形貌及性能的影响

放大字体  缩小字体发布日期:2012-04-09  浏览次数:693

摘要:介绍了低温镀铁的工艺配方及流程。利用扫描电镜观察了镀层的组织形貌,利用硬度计测试了镀层硬度,利用锉刀法和热震法检验了镀层的结合强度,考察了pH对沉积速率、显微硬度和耐蚀性能的影响。结果表明,所得镀层结合力良好, pH为1.0时,沉积速率最高,耐蚀性能最好;镀层硬度随pH的升高而增大,最大值为587.43 Hv。

 

关键词:镀铁;组织形貌;沉积速率;显微硒唐;耐蚀性;结合力

 

中图分类号:TQl53.19    文献标志码:A

 

文章编号:1004—227X(2009)02—0011—02

 

Effect of pH on structure morphology and properties of low—temperature iron plating//ZHANG Wei,YIN Jin-jie,LIU Yi+

 

Abstract:The process formulation and flow of low- temperature iron plating were introduced.The structure morphology of deposit was observed by SEM,the hardness of deposit was tested by hardness tester and the adhesion strength of deposit was examined by file and thermal shock methods.The effect of pH on the deposition rate,micro- hardness and corrosion resistance was studied.The results showed that the deposit has good adhesion,and at pH l.0,it has best corrosion resistance and the highest deposition rate can be obtained.The hardness rises as the pH increases, reaching the maximum of 587.43 HV.

 

Keywords:iron platin9;structure morphology;deposition rate;microhardness;corrosion resistance;adhesion strength

 

First-author’s address:Department ofMaterial Science& Engineerin9,Liaoning Technical Univemity,Fuxin l23000,China

 

1  前言

 

无刻蚀低温镀铁工艺在国内外强化零件表面和修复磨损件与DHT-超差件上得到了广泛应用[1-2],得到的铁镀层还可作为铸铁件电镀锌、锡、铬前的中间层或热浸锌前的中间层[3]。该工艺主要以氯化亚铁溶液为电镀液,采用对称交流活化,不对称交流电起镀,可在30~50℃条件下得到软的、结合力好的底层,再用直流电电镀,镀层的硬度较高。镀液的沉积速率快,均镀能力强,能得到纯度高、韧性好、内应力小的较厚的镀层。本文着重研究pH对铁镀层性能的影响。

 

2  实验

 

实验采用自制不对称交一直流电源。阴极为Q235低碳钢(ф10 mm×80 mm),阳极为普通低碳钢片(100mm×30 mm/1×2 mm),阴阳极面积比为l:4。

 

2.1工艺参数及流程

 

    低温镀铁的工艺参数为:400 g/L FeCl2·4H20,

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