孙一航,张保财,贾秀杰,李方义,张健,王光存.再制造零件表面油漆的熔盐清洗去除作用[J].表面技术,2018,47(9):279-286.
SUN Yi-hang,ZHANG Bao-cai,JIA Xiu-jie,LI Fang-yi,ZHANG Jian,WANG Guang-cun.Removal Effect of Molten Salt Cleaning for Paint Coatings on Remanufactured Parts[J].Surface Technology,2018,47(9):279-286 |
| 再制造零件表面油漆的熔盐清洗去除作用 |
| Removal Effect of Molten Salt Cleaning for Paint Coatings on Remanufactured Parts |
| 投稿时间：2018-06-03 修订日期：2018-09-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.09.037 |
| 中文关键词: 再制造 油漆去除 熔盐清洗 气化 热膨胀 氧化 活化能 |
| 英文关键词:remanufacturing paint removal molten salt cleaning gasification thermal expansion oxidation activation energy |
| 基金项目:国家自然科学基金资助项目（51375278）；江苏省自然科学基金资助项目（BK20170246）；企事业单位委托项目（11381704） |
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| Author | Institution |
| SUN Yi-hang | 1.a. School of Mechanical Engineering, b. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China |
| ZHANG Bao-cai | 1.a. School of Mechanical Engineering, b. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China |
| JIA Xiu-jie | 1.a. School of Mechanical Engineering, b. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China |
| LI Fang-yi | 1.a. School of Mechanical Engineering, b. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China |
| ZHANG Jian | 1.a. School of Mechanical Engineering, b. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China |
| WANG Guang-cun | 2.XCMG Research Institute, Xuzhou 221116, China |
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| 中文摘要: |
| 目的 针对再制造零件表面油漆去除效率低、清理不彻底的问题，使用熔盐清洗技术对油漆进行清洗，针对熔盐清洗去除机理展开深入研究，并探究熔盐清洗比高温热分解处理去除效率高的原因。方法 利用SEM电镜对油漆微观形貌进行观察，分析了油漆内部结构特点及元素分布，并以此为基础进一步阐释了熔盐清洗的气化、热膨胀以及氧化作用。通过热重实验，确定油漆、油漆与熔盐混合物最大失重速率的发生温度，并采用Coats-Redfern积分法对热解过程进行动力学分析，计算油漆高温热分解和在熔盐中反应对应的活化能。结果 油漆内部呈现明显的分层结构，由环氧树脂类底漆和聚氨酯类面漆组成，主要组分为有机物，在高温环境下表面会发生软化，因此熔盐热膨胀作用的除漆效果不明显，熔盐去除机理中的气化和氧化作用为主要去除作用。热重实验结果表明，熔盐在300 ℃左右具有良好的热稳定性和较大的热容，与高温热分解相比，熔盐使油漆最大分解速率发生温度从350 ℃降至305 ℃，使油漆分解活化能由高温热分解所需的114.4 kJ/mol降至74.1 kJ/mol。结论 熔盐清洗的主要去除作用为气化和氧化作用，能够有效降低油漆最大分解速率的发生温度和油漆分解反应所需的活化能，提高油漆去除效率，降低反应温度。 |
| 英文摘要: |
| For the problems of remanufactured parts including low surface paint removal efficiency and incomplete cleaning, the work aims to use molten salt cleaning technology for cleaning, study removal mechanism of molten salt cleaning thoroughly, and compare the reasons of high removal efficiency of molten salt cleaning with those of thermal decomposition treatment. Micro-morphology of the paint was observed by SEM. Besides, internal structural characteristics and element distribution of the paint were analyzed. Based on former results, gasification, thermal expansion and oxidation effects of molten salt cleaning were further explained. Thermogravimetric experiment was used to determine temperature at which the maximum weight loss rate of paint and paint and molten salt mixture occurred, kinetic analysis of pyrolysis process was carried out in Coats-Redfern integration method, and corresponding activation energy of thermal decomposition and in the molten salt was calculated. A distinct layered structure consisting of an epoxy resin primer and a polyurethane-based finish appeared inside the paint. Main components of the structure were organic substances. The surface would be softened under high-temperature conditions. Therefore, thermal expansion effect of the molten salt did not significantly affect paint removal, and gasification and oxidation effects in the molten salt removal mechanism were the main removal effects. According to the thermogravimetric experiment result, it could be seen that the molten salt exhibited good thermal stability and large heat capacity at about 300 ℃. Compared with high temperature thermal decomposition, the molten salt made the maximum decomposition rate of the paint reduce from 350 ℃ to 305 ℃, and decomposition activation energy of the paint reduce from 114.4 kJ/mol to 74.1 kJ/mol. Main removal mechanisms of molten salt cleaning are gasification and oxidation, which can effectively reduce the maximum decomposition rate of paint and activation energy required by decomposition reaction, improve efficiency of paint removal, and reduce reaction temperature. |
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