Abstract This paper presents the effects of tensile stress and corrosion environment on the protective performance of organic coatings on hydraulic metal structures. Accelerated ageing tests are performed on the organic coatings for 3600 h in UV-condensation test chambers and under immersion conditions. Gloss loss, color difference, thickness, rust area and adhesion of organic coatings are investigated. Acceleration coefficient between the accelerated ageing tests and the natural ageing environment are discussed based on the corrosion degree comparison method. The results show that corrosion degree of the coatings increases with the prolonging of the test time. Coatings are corroded more seriously in salt water than that in fresh water. Tensile stress accelerates the corrosion process of the organic coatings, and the corrosion degree of the organic coatings increases with the increase of stress levels. The corrosion process of the organic coatings could be divided into two stages: first stage is the time from the beginning to the appearance of rust; second stage is the time from the appearance of rust to the 5% of rust area rate. The gloss loss rate is chosen to evaluate the corrosion behavior of the coatings in the early stage, while the rust area rate is chosen to evaluate the corrosion behavior of the coatings in the middle and later stage. A life evaluation model of the organic coatings on hydraulic metal structures is established based on the acceleration coefficient. The influences of corrosion environment and tensile stress on the coating life are considered via the gloss retention coefficient and the corrosion inhibition coefficient in the model.

中文翻译：

---

水工金属结构有机涂层寿命评价

摘要 本文介绍了拉应力和腐蚀环境对水工金属结构有机涂层保护性能的影响。在紫外冷凝试验箱中和在浸没条件下对有机涂层进行了 3600 小时的加速老化试验。研究了有机涂层的光泽损失、色差、厚度、锈蚀面积和附着力。基于腐蚀程度比较法，讨论了加速老化试验与自然老化环境之间的加速系数。结果表明，涂​​层的腐蚀程度随着试验时间的延长而增加。涂层在盐水中比在淡水中腐蚀更严重。拉应力加速了有机涂层的腐蚀过程，有机涂层的腐蚀程度随着应力水平的增加而增加。有机涂层的腐蚀过程可分为两个阶段：第一阶段是从开始生锈到出现锈蚀的时间；第二阶段是从出现锈迹到锈蚀面积率5%的时间。前期选择失光率评价涂层的腐蚀行为，选择锈蚀面积率评价中后期涂层的腐蚀行为。建立了基于加速系数的水工金属结构有机涂层寿命评价模型。