摘要：焚烧处理是解决城镇市政及工业垃圾的科学手段，可有效减少垃圾占用空间及实现资源化。然而，焚烧过程中，锅炉管道的受热面处于严重的腐蚀气氛中，尤其是高温下氯及氯盐产生自催化效应，使得管壁遭受严重的腐蚀而影响服役寿命，严重地影响焚烧电厂的运行安全和经济效益。

本课题针对垃圾焚烧炉锅炉管道的高温氯腐蚀问题，设计NiCr基涂层材料，通过电弧喷涂制备工艺超致密抗腐蚀涂层。运用光学显微镜、扫描电子显微镜及X射线分析涂层孔隙率、显微结构及物相组成；采用动极化曲线分析涂层基本的电化学性能；通过配比氯盐模拟锅炉高温氯腐蚀环境分析涂层抗高温氯腐蚀性能。并与典型锅炉钢管材料12CrMoV对比分析，得到以下主要结论：

1) 采用改进喷涂工艺，通过高速电弧喷涂获得了孔隙率为0.78%的超致密NiCrMo涂层，显著降低了传统电弧喷涂涂层的孔隙率（5%-10%）。

2) 动极化曲线结果显示，该超致密NiCrMo涂层自腐蚀电位低于12CrMoV，其自腐蚀电位密度仅为后者的1/10；模拟熔融氯盐腐蚀结果显示，超致密NiCrMo涂层腐蚀速率常数显著低于12CrMoV。

关键词  高温氯腐蚀  电弧喷涂  熔融盐   NiCrMo涂层

毕业设计说明书外文摘要

Title   The Processing and the Corrosion Properties of Nickel-based Coatings by High-speed Arc Spraying  

Abstract：Incineration is the scientific means to solve the municipal municipal and industrial waste, which can effectively reduce the space occupied by garbage and realize the resource.However, during the incineration process, the heating surface of the boiler pipe is in a serious corrosive atmosphere, especially at high temperature chlorine and chlorine salt to produce autocatalytic effect, which makes the pipe wall suffer serious corrosion and affect the service life,which seriously affects the operational safety and economic benefits of incineration power plants.

In this paper, the NiCr-based coating material is designed for the high temperature chlorine corrosion of the waste incinerator boiler pipeline, and the ultra-dense anti-corrosion coating is made by arc spraying process.The microstructure and phase composition of the coating were analyzed by optical microscope, scanning electron microscope and X-ray. The electrochemical properties of the coating were analyzed by dynamic polarization curve. The corrosion resistance of the coating was investigated by simulating the high temperature chlorine corrosion environment of the boiler. And with the typical boiler steel pipe material 12CrMoV comparative analysis, the following main conclusions:

1) The ultra-dense NiCrMo coating with porosity of 0.78% was obtained by high-speed arc spraying using the improved spraying process, which significantly reduced the porosity (5% -10%) of the traditional arc spray coating.

2) The results of dynamic polarization curves show that the self-corrosion potential of the ultra-dense NiCrMo coating is less than 12CrMoV, and the self-corrosion potential density is only 1/10 of the latter.The results show that the corrosion rate constant of NiCrMo coating is lower than that of 12CrMoV.

Keywords  high temperature chlorine corrosion   arc spraying  molten salt  NiCrMo coatings

目   次

1  绪论 1

1.1  研究背景 1

1.1.1  垃圾焚烧炉管道的腐蚀问题 1

1.1.2  腐蚀机理 2

1.1.3  垃圾焚烧炉高温氯腐蚀的特点 6

1.1.4  垃圾焚烧炉管道防护方法 7

1.2  热喷涂技术 7

1.2.1  热喷涂的原理及技术特点 7

1.2.2  热喷涂涂层在抗腐蚀方面的研发现状 8

1.3  电弧喷涂技术 10

1.3.1  电弧喷涂技术的原理及工艺特点 10

1.3.2  电弧喷涂抗腐蚀涂层的研究现状 12