摘要
已有的硫酸盐三价铬镀铬,镀液稳定性、抗杂质能力和工艺可操作性较差,阳极制作复杂,价格昂贵。开发出一种以不锈钢片为阳极的硫酸盐三价铬镀铬新工艺,探讨了电流密度、温度、pH值、主盐浓度等因素对电流效率的影响。研究表明:镀液温度为35～50℃,pH值为3.0～4.5,电流密度为1.5～5.5A/dm2,电镀时间在3～5min时,能得到光亮且结合牢固的镀层;电流效率可达30%左右;霍尔槽阴极镀层覆盖长达10cm;分散能力达到60%左右;镀液抗杂质性能好;pH值升高到6.5再回调至正常范围后,镀液仍可以使用。该工艺有效克服了目前硫酸盐三价铬镀铬的缺点,应用前景广阔。
A novel process for trivalent chromium plating in sulfate bath was developed using stainless steel as the anode.The effects of current density,temperature,pH value and concentration of main salt on current efficiency were studied.It was found that bright coating with good adhesion to substrate could be obtained at a bath temperature of 35 ～ 50 ℃,pH value of 3.0 ～ 4.5 ,current density of 1.5 ～ 5.5 A/dm2 and plating time of 3 ～ 5 min.Corresponding current efficiency was about 30%.Besides,the coating coverage on Hull cell panel was up to 10 cm,and the throwing power was about 60%.The plat-ing bath had good endurance against impurities.Moreover,the plating solution could be recycled when pH value was promoted to 6.5 and then readjusted to normal range.This process showed a promising prospect for application of trivalent Cr plating.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第8期32-35,共4页
Materials Protection
基金
福建省科技计划重点项目(2008H0086)
国家自然科学基金项目(20873114)
福建省产业技术开发项目(闽发改高技[2010]299号)
关键词
镀铬
三价铬
硫酸盐
添加剂
不锈钢阳极
chromium plating
trivalent chromium
sulfate
additive
stainless steel anode
