3种常温磷化促进剂的作用及其协同效应  

Accelerating Performance and Synergistic Effect of Three Kinds of Accelerators for Room Temperature Phosphating

作　　者：蒋利民[1] 杨永生[1] 王汉丹[1] 

机构地区：[1]南昌航空大学材料科学与工程学院轻合金加工科学与技术国防重点学科实验室,江西南昌330063

出　　处：《材料保护》2010年第6期38-41,共4页Materials Protection

基　　金：航空基金(080356004);轻合金加工科学与技术国防重点学科实验室基金(gf0901009);南昌航空大学科研基金(EA0801061)

摘　　要：常温磷化无毒、节能,但成膜速度慢,且膜的耐蚀性能差。为此,在传统的常温磷化液中加入3种促进剂,运用扫描电镜、退膜法、硫酸铜点滴试验、电化学测试等手段,对磷化膜表面形貌、膜重、耐蚀性能等进行了测量,研究了3种促进剂在常温磷化中的促进作用及机理,分析促进剂之间的协同效应,优选出加速效果比亚硝酸盐更好的复合促进剂(1.0g/L氯酸钠,0.5g/L3-硝基苯磺酸钠,1.0g/L硫酸羟胺)。结果表明:3种促进剂在常温下均能促进磷化膜形成,但促进机理不同;优选复合促进剂具有很好的协同效应,能加快成膜速度,形成均匀、致密、耐蚀性优良的磷化膜,且磷化过程不会分解出有毒气体NOX,完全可以取代亚硝酸盐。Three kinds of accelerators were introduced into conventional room-temperature phosphating fluids.The effect of the accelerators on the morphol-ogy,mass and corrosion resistance of the phosphating films was analyzed by observation with a scanning electron microscope andby conducting film-releasing tests,copper sulfate dropping tests and electrochemical tests.The accelerating performance and mechanism as well as synergistic effect of the accelerators were investigated,and the optimized composition of the composite ac-celerator was determined.Results indicate that the composite ac-celerator composed of 1.0g/L sodium chlorate,0.5 g/L sodium 3-nitrobenzene sulfonate and 1.0 g/L hydroxylamine sulfate has better accelerating performance than titrate.All the three kinds of accelerating agents were able to accelerate phosphating process at room temperature,but functioned via different mechanisms.The composite accelerator with optimized composition showed good synergistic effect and was able to increase film-formation rate,re-sulting in uniform and compact phosphating films with good corro-sion resistance.At the same time,no toxic gas NOx was pro-duced during the phosphating process in the presence of the ac-celerators,implying that the composite accelerator could be well used to replace nitrites.

关 键 词：常温磷化 复合促进剂 促进作用 协同效应 

分 类 号：TG174.4[金属学及工艺—金属表面处理]