球磨钢件表面残留锈蚀度及其对热浸镀锌漏镀的影响  

The Degree of Rust Remaining on the Surface of Ball-milled Steel Parts and Its Effect on the Leakage of Hot-dip Galvanizing

作　　者：李智伟 彭浩平[1,2] 吴长军[1,2] 王建华[1,2] 苏旭平[1,2] LI Zhi-wei;PENG Hao-ping;WU Chang-jun;WANG Jian-hua;SU Xu-ping(Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Jiangsu Changzhou 213164,China;Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering,Changzhou University,Jiangsu Changzhou 213164,China)

机构地区：[1]常州大学江苏省材料表面科学与技术重点实验室,江苏常州213164 [2]常州大学江苏省光伏科学与工程创新中心,江苏常州213164

出　　处：《表面技术》2022年第12期151-158,177,共9页Surface Technology

基　　金：国家自然科学基金面上项目(51971039、51771035);江苏省研究生科研与实践创新计划项目(KYCX21-2800)。

摘　　要：目的探究球磨前处理对钢件表面残留锈蚀度及其对热浸镀锌漏镀的影响,以期开发一种环境友好型的热浸镀锌工艺。方法采用自主设计的高温双筒球磨机,对热浸镀锌钢件进行前处理。采用光学与电子显微镜分析球磨参数对钢件表面残留锈蚀度的影响。对球磨后的钢件进行热浸镀锌,采用扫描电镜(SEM)、X-射线衍射仪(XRD)以及高温悬滴式接触角测定仪研究钢件表面残留锈蚀产物及其对热浸镀锌漏镀的影响。结果随着磨球粒径的增大,钢件表面残留锈蚀度α先减小后增加,磨球粒径为5 mm时达到最小值;随着滚筒转速和球磨时间的增加,钢件表面残留锈蚀度不断减少;当磨球粒径为5 mm、滚筒转速为140 r/min和球磨时间为40 min时,钢件表面残留锈蚀度α可减少到0。随着钢件表面残留锈蚀度的减小,锌液滴与基体间的接触角减小。当残留锈蚀度达到0时,接触角θ=84°,锌液在基体表面均匀铺展,可避免漏镀的发生。结论球磨除锈可以代替酸洗除锈,以减少热浸镀锌工艺对环境的污染。Batch hot-dip galvanizing is a mature corrosion protection method. However, the waste acid and gas generated in the pretreatment seriously pollute the environment, which urgently requires the development of an environmentally friendly hot-dip galvanizing. Ball-milling is a promising surface treatment method. The use of ball-milling instead of pickling in the traditional hot-dip galvanizing can avoid the generation of waste acid and meet the sustainable development requirements of green environmental protection.The iron ingot samples(20 mm × 20 mm × 3 mm) were used as the raw material Before hot-dip galvanizing, the samples were alkaline washed in 15wt.% NaOH solution at 70-90 ℃ for 3 min to remove surface grease. Then, at room temperature, the surface oxides were removed by pickling or ball-milling. Pickling is to soak the alkali-washed sample in a 10wt.%-15wt.% hydrochloric acid solution for 3 min. Ball-milling is to put the alkali-washed samples together with 304stainless steel grinding balls into a ball mill with a diameter of 60 mm, and remove the oxides on the surface of the samples through the mechanical action of the grinding balls. Based on theoretical calculations, the ball-milling parameters designed: the particle size of the grinding ball d = 2 mm, 5 mm, 8 mm;the rotational speed of the drum r=120 r/min,130 r/min, 140 r/min, 150 r/min;the filling factor of the grinding ball is 0.5. The rust-removed samples were rinsed in deionized water and then fluxed. The NH4Cl-ZnCl2solution(1.2∶1) with a concentration of 200-300 g/L using as the fluxing agent, the temperature was(75±5) ℃, and the time was 5 min. Then the samples were immediately dipped in the zinc bath after being dried in a blast drying oven at 100 °C for 10 min. The composition of the zinc bath is 99.9wt.% pure zinc, the mass is 2 kg, the temperature is(450±3) ℃, and the time is 60 s. The hot-dipped workpiece is slowly lifted out of the zinc bath, and then immediately quenched in water.Optical Microscope was used to observe the effect

关 键 词：球磨 前处理 热浸镀锌 润湿性 漏镀 

分 类 号：TG174.441[金属学及工艺—金属表面处理]