摘要QPQ 盐浴复合处理技术从发明到不断的优化改良，主要目的是为了提高工件的 表面性能，最重要的作用就是提高试样表面的耐磨性和抗腐蚀性。做为一个冶金领域 上的伟大突破，它实现了金属材料工程热处理与防腐蚀技术的结合。相比普通热处理 技术，它可以更好的提高金属的抗磨性，而且对镀层的耐蚀性得提高也明显高于镀铬 处理，且不会发生变形。这项技术相比于其他类似效果处理技术有很多优势，降低成 本的同时生产效率也大幅提高。QPQ 技术因为它的无公害理念，已经被全世界普遍 认可，因此它的发展前景一片大好。83335

45 号钢为中碳钢，一般调质处理后它的综合机械性能较为优良，所以被广泛地应用于各种机械零构件，比如一些机械轴、齿轮、连杆等。但 45 号钢的缺陷也很明 显，抗腐蚀性能很差，也不具备很好的耐磨性。为满足更高的服役条件，需要进行 QPQ 盐浴复合处理。本实验根据 45 号钢实际使用情况，对多组 45 号钢试样进行 QPQ 盐浴复合处理，通过金相显微镜、扫描电镜等手段观察渗层，利用 X 射线衍射分析 渗层的成分组成。

本试验采用控制氧化温度不变，改变氧化时间或控制氧化时间，在不同温度条件 下氧化的方法，来探求氧化温度和氧化时间对 45 号钢抗腐蚀性能的影响。实验表明，45 号钢的抗蚀性随氧化温度的升高而增强，最佳的氧化温度为 410℃，而最佳的氧化 时间则以在试样表面形成致密完整的氧化膜为准。

毕业论文关键词：QPQ 技术；微观组织；抗蚀性

Abstract QPQ technology from invention to continuous optimization and improvement, the main purpose is to improve the surface properties of the workpiece, the most important role is to improve the wear resistance of the specimen surface and corrosion resistance。 As a great breakthrough in the field of metallurgy, it realizes the combination of heat treatment and corrosion protection technology of metal materials。 Compared with the conventional heat treatment technology, it can improve the wear resistance of the metal, and the corrosion resistance of the coating was also significantly higher than that of chromium plating treatment, and will not be deformed。 This technology has many advantages compared to other similar processing technology, reduce the cost of production efficiency is also greatly improved。 QPQ technology because of its non pollution concept, has been widely recognized around the world, so its development prospects are excellent。

45 steel is medium carbon steel, and its comprehensive mechanical properties are excellent, so it is widely used in all kinds of mechanical components, such as mechanical shaft, gear, connecting rod, etc。。 However, the defects of the 45 steel is also very  obvious,  the corrosion resistance is very poor, do not have a good wear resistance。 In order to meet the higher service conditions, the need for QPQ compound treatment。 This experiment based on the 45 steel actual usage, QPQ Complex salt bath treatment group of 45 steel samples, by means of optical microscope and scanning electron  microscope  (SEM) observation layer, by using X ray diffraction analysis of infiltration layer composition。

The experiment was used to control the oxidation temperature, change the oxidation time or control the oxidation time, oxidation in different temperature conditions, to explore the influence of oxidation temperature and oxidation time on the corrosion resistance of 45 steel。 The experimental results show that the corrosion resistance of 45 steel increases with

the increase of oxidation temperature, the optimum oxidation temperature is 410  ℃, and

the best oxidation time is to form a compact and complete oxide film on the surface of the sample。