摘要
将α型纳米Al2O3加入到磷化液中，选择合适的分散剂，在一定的温度范围内进行磷化，通过共沉积使纳米材料包裹在磷化膜层中。以达到改善磷化膜质量、提高膜层性能的目的。研究了磷化温度、时间、分散剂和纳米用量及酸度调节刑Na2CO3对反应的影响，通过正交试验得出最优磷化工艺参数为：18．0g／L ZnO，1．0g／LNi（NO3）2，16mL／L HNO3，3．0g／L Ca（NO3）2，28．5mL／L H3PO4，5．0g／L Mn（H2PO4）2，2．0—5．0g／L柠檬酸，1.0—5．0g／L酒石酸，3．0—5．0g／L复合促进剂，11．0g／L Na2CO3，4．0g／Lα型纳米Al2O3，分散剂A2．5g／L，磷化温度80℃，磷化时间12min。经X射线、扫描电镜、电子探针等测试分析发现，加入的仅型纳米Al2O3在磷化膜层中基本均匀分布。用细纱纸摩擦法测试磷化膜的耐磨性，发现加入仅型纳米Al2O3的磷化膜耐磨性明显增强。
A proper dispersant was used to disperse nanoparticulates of alumina (coded as α-n-Al_ 2O_ 3) in a conventional phosphating bath, which was aiming at improving the quality and properties of the phosphating film by inclusion of the α-n-Al_ 2O_ 3 particulates at desired conditions. Thus the effects of phosphating temperature, α-n-Al_ 2O_ 3 content, and Na_ 2CO_ 3 as the acidity adjusting agent on the phosphating process were investigated. The optimal phosphating conditions were determined based on orthogonal test. Moreover, the morphology and structure of the phosphating film were analyzed by means of X-ray diffraction, scanning electron microscopy, and electron probing. And the wear resistance of the film was evaluated by sliding against fine sand papers. As the results, the optimal phosphating bath was determined to be composed of 18.0 g/L ZnO, 1.0 g/L Ni(NO_ 3)_ 2, 16 mL/L HNO_ 3, 3.0 g/L Ca(NO_ 3)_ 2, 28.5 mL/L H_ 3PO_ 4, 5.0 g/L Mn(H_ 2PO_ 4)_ 2, 2.0～5.0 g/L citric acid, 1.0～5.0 g/L tartaric acid, 3.0～5.0 g/L complex accelerating agent, 11.0 g/L Na_ 2CO_ 3, 4.0 g/L α-n-Al_ 2O_ 3, and 2.5 g/L dispersant A. The optimized phosphating temperature and duration were determined to be 80 ℃ and 12 min, respectively. The target phosphating film prepared under the optimized conditions had uniformly distributed α-n-Al_ 2O_ 3 and increased wear resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2006年第4期16-20,共5页
Materials Protection
