区域特殊环境对钢结构涂层基本力学性能影响

Influence of Regional Special Environment on the Basic Mechanical Properties of Steel Structure Coating

采用模拟自然环境下工程材料耐久性损伤试验系统和人工加速紫外老化试验箱,对钢结构涂层进行高低温循环试验和紫外老化试验,分析内蒙古中西部地区区域特殊环境对钢结构涂层基本力学性能的影响.结果表明:高低温循环作用使钢结构涂层的氢键化程度增加,分子间作用力增大,经历50个高低温循环后钢结构涂层的硬度提高了24.74%,涂层/基材附着力先增大后减小,最终减小了18.3%;紫外老化作用使钢结构涂层中C—N和C—O键断裂,紫外老化3 a后钢结构涂层的硬度降低了44.37%,涂层/基材附着力减小了22.7%.

Based on the characteristics of the regional special environment in the Midwest of Inner Mongolia,the high-low temperature cycling tests were carried out on the steel structure coating in an experimental system for simulating durability damage of engineering materials under natural environment.The ultraviolet aging tests were also carried out on the steel structure coating in a UV aging test chamber.The influence of special environment on the basic mechanical properties of steel structure coatings was analyzed.The results show that the high-low temperature cycling increases the degree of hydrogen bonding and the intermolecular forces of the steel structure coating.Through fifty high-low temperature cycles,the hardness of the steel structure coating is increased by 24.74%,and the adhesion increases at first and then decreases,reducing overall by 18.3%.UV aging will lead to the C—N and C—O bond rupture.The hardness of the steel structure coating is reduced by 44.37%,and the adhesion is reduced by 22.7%after 3 years of UV aging.