气流场内水平金属板表面缓蚀剂膜失效规律

根据油溶性缓蚀剂涂膜作用机制,将缓蚀剂涂膜层近似认为易流动膜层和不易流动膜层,研究缓蚀剂涂膜流动失效规律。根据易流动膜层内流速分布规律,分析其厚度随流动时间的变化规律;基于分子浓差扩散方程,建立不易流动膜层厚度失效定解方程,并建立描述油膜失效速率的数学模型。结果表明:金属板表面缓蚀剂涂膜的失效是流动与分子扩散共同作用的结果;缓蚀剂主剂在气流场内流动致使涂膜厚度迅速下降;有效成分吸附在金属表面,难以发生流动,因分子扩散而失效,膜层厚度变化缓慢;拟合曲线与试验数据吻合很好。

Failure rules of oil-soluble corrosion inhibitor film on horizontal metal surface placed in gas flow field

The failure rules of inhibitor film caused by gas flow were discussed. According to the mechanism, the oil-soluble corrosion inhibitor film was approximately divided into two types:film layer with good fluidity and film layer with poor fluidity. Based on the velocity distribution in easily flowing film layer, the thickness variation with the flowing time was analyzed. Based on the molecular concentration diffusion equation, the governing algebraic equations of thickness failure of not-easy-flow film layer were proposed. Considering the interaction of flow and molecular diffusion,the mathematical model describing the failure rate of the oil film was established. The results show that the failure of inhibitor film is determined by both flow and molecular diffusion. The flow of main solvent in inhibitor makes the film thickness decrease rapidly, but the thickness of not easily flowing film layer formed by molecular adsorption decreases slowly. The fitting curve is in agreement with the experimental data.