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介绍了自主研制的高加速自然环境试验系统的相关理论、设计思想、系统结构、及各子系统功能.该系统能同时强化太阳辐射、Cl~-(或其它污染物)、温度和于湿循环等影响材料大气腐蚀的主要环境因素,从而解决了现行自然加速试验技术存在的强化因素片面的技术缺陷.提出了表面湿润度理论,在此基础上自主研发了表面湿润传感器,实现干湿循环的智能控制和优化强化,提高了加速倍率.利用本系统对选定材料进行试验并与远海暴露场和海洋平台暴露试验对比.结果表明,与远海暴露场户外暴露试验相比,钢,Al,Zn,Cu腐蚀的加速倍率分别为11.8,11.5,9.3和3.7倍;对涂层的加速退化效果明显;PE和PVC抗拉强度退化的加速倍率分别为113和1.1;相对海洋平台暴露,金属材料腐蚀的加速倍率约为远海暴露场暴露的一半.腐蚀产物分析结果表明,金属材料腐蚀产物成分和结构基本相同.试验验证结论为:该系统适用于金属、涂层、塑料及其构件的耐大气腐蚀性快速评价.
The related theory, design idea, system structure and function of each subsystem of self-developed high-accelerated natural environment test system are introduced.The system can simultaneously strengthen solar radiation, Cl ~ - (or other pollutants), temperature and wet cycle And other major environmental factors that affect the atmospheric corrosion of materials to solve the technical flaws existing in the existing natural acceleration test technology of the existence of the strengthening factors one by one.The surface wetness theory is proposed on the basis of independent research and development of the surface wetness sensor to achieve the wet and dry cycle Intelligent control and optimization enhancement, and accelerated the magnification.The selected materials were tested with this system and compared with the exposure test of far-sea exposure field and offshore platform.The results showed that compared with the outdoor exposure test in far-sea exposure field, the contents of steel, Al, Zn , Cu corrosion acceleration of magnification were 11.8,11.5,9.3 and 3.7 times; the accelerated degradation of the coating effect is obvious; PE and PVC accelerated degradation rate of degradation were 113 and 1.1; relative to the offshore platform exposure, corrosion of metal materials Of the accelerating rate is about half of the exposed sea far field exposure.Corrosion product analysis results show that the corrosion resistance of metal materials composition and structure are basically the same. Verify test conclusion: The system is suitable for metal, coatings, plastics and member rapid evaluation of weather resistance.