深海环境下新型纳米复合涂层与钢构件变形协同机制的加速模拟试验

Accelerated Simulation Test of Synchronization Mechanism of New Nanocomposite Coating and Steel Member Deformation in Deep Sea Environment

较高的实验成本以及技术问题使得深海原位腐蚀研究难以实施,采用加速模拟锈蚀试验模拟深海环境下金属涂层的腐蚀过程。为解决现有复合涂层耐久性差、变形协同性不好、微裂纹扩展速度快等问题,拟进行仿壁虎效应设计,引入多组分纳米粒子及多组分表面活性剂,利用共混法研制新型纳米复合涂层,通过电化学试验及力学性能实验分析检测纳米复合涂层与钢构件的变形协同性,利用动电位扫描法测量腐蚀电流密度,筛选出最优的纳米复合涂层匹配方案。实验结果表明:新型纳米复合涂层中的纳米添加剂能与基体形成分子层面的结合力,具有比普通涂层显著的防腐效果和与基体良好的变形协同性能。氯化橡胶+纳米氧化锌(ZnO)复合涂层直到与基体拉断时都不曾开裂和脱落,具有良好的防腐效果和与钢构件较好的变形协同性,能够满足未来深海环境下对涂层耐久性的需求。

At present,deep sea in-situ corrosion studies are difficult to implement due to high experimental costs and technical problems.An accelerated simulated corrosion was adopted,which focused on simulating the accelerated corrosion experiment of metals in deep sea environment.An innovative method to the design of gecko effect was proposed in order to solve the problems of poor durability,poor deformation synergy,and rapid propagation of microcracks in the widely used composite coatings.Magnetic chiral molecules,multi-component nanoparticles,and multi-component surfactants were added.Electrochemical test and mechanical properties test were performed to analyze the deformation synergy between nanocomposite coating and steel component.Corrosion current density was measured by potentiodynamic scanning method in order to screen the optimal nanocomposite coating matching scheme.Results showed that nano-additives in novel nanocomposite coating can form a molecular layer bonding force with the steel components,and have a remarkable anticorrosive effect compared with ordinary coating.The chlorinated rubber+zinc oxide(ZnO)nanocomposite coating had the best anti-corrosion effect and deformation synergy with steel components in deep sea environment,which can better meet the needs of coating durability in deep sea environment in the future.