摘要镁合金性能优良，在各行各业中得到广泛应用。但因其化学性质非常活泼，极易在空气中生成疏松多孔的氧化膜，使其在应用过程中易腐蚀，尤其在潮湿空气、海水、各种有机酸及其盐、无机酸等环境中其耐蚀性很差。目前，在镁合金表面改性方面采用的方法主要是表面涂层技术，以保护镁合金基体不与外部环境接触。86685

本文主要研究酸洗、活化等前处理工艺对镁合金表面的影响，确定酸洗活化的配方液组成，通过改变配方液中各组分的浓度，依据观察前处理工艺过后镁合金的表面形貌，判断该实验中处理液的最优配比。

通过采用蔡司显微镜、X射线衍射等对样品进行了形貌分析和物相结构分析。结果表明：当磷酸100ml/L、硝酸60ml/L、氟离子3g/L时，酸洗液效果最好；当氢氟酸300ml/L、磷酸二氢钾20g/L时活化液效果最好。

毕业论文关键词：镁合金；前处理工艺；表面涂层

Abstract Magnesium alloy has been widely used in all walks of life because of its excellent properties。 But magnesium alloys are very lively，easily in the air generating porous oxide film，the in use easy to corrosion in the process，especially in the humid air，sea，and all organic acid and its salts，inorganic acid as the corrosion resistance of the poor。 At present， the method used in the surface modification of magnesium alloy is nothing more than the surface coating technology，so as to protect the magnesium alloy substrate from contacting with the external environment。

In this paper，we mainly study the pickling and activation pretreatment process of magnesium alloy surface effects determined pickling and activation of the solution formula of drug selection，changes in the concentrations of the components in the solution formula， according to the observation of treatment after the process of magnesium alloy surface morphology to determine the optimal ratio of liquid in the experiment。

The morphology and phase structure of the samples were analyzed by means of the microscope and X - ray diffraction。 The results show that when the 100ml / L phosphate， nitrate 60ml，fluorine ion 3g / L， the pickling liquid effect is the best； when the hydrofluoric acid 300ml/L，potassium dihydrogen phosphate 4G / L activated liquid effect is the best。

Keywords：Magnesium alloy；Pretreatment process；Surface coating

目  录

第一章  绪论 1

1。1 镁及镁合金的简介与应用 1

1。2 镁及镁合金的研究现状 1

1。2。1 镁及镁合金的腐蚀种类 1

1。2。2 镁合金表面处理方法 2

1。3镁及镁合金化学镀镍前处理研究现状 4

1。3。1磷酸盐系列 5

1。3。2锡酸盐系列 5

1。3。3稀土盐系列 5

1。4镁合金化学镀镍镀液研究 6

1。5本课题的选择意义和主要内容 6

第二章  镁合金前处理工艺研究 7

2。1 实验材料与仪器 7

2。1。1 实验材料 7

2。1。2 实验药品 7

2。1。3 实验仪器 7

2。2 实验步骤 8

2。2。1 镁合金表面打磨 8