Most metals naturally corrode in an engineering environment and form corrosion products. The corrosion products can be either soluble or insoluble in the aqueous solution. The insoluble corrosion products (ICP) could have profound effects on the corrosion kinetics of the concerned metal. In this study, a multi-phase-field formulation is proposed to investigate the effects of ICP formation on pitting corrosion kinetics. The Gibbs free energy of the metal-electrolyte-insoluble corrosion product system consists of chemical, gradient, and electromigration free energy. The model is validated with experimental results and several representative cases are presented, including the effect of the porosity of ICP, under-deposit corrosion, corrosion of sensitized alloys, and microstructure-dependent pitting corrosion. It is observed that corrosion rate and pit morphology significantly depend on ICP and its porosity for the same applied potential.

大多数金属会在工程环境中自然腐蚀并形成腐蚀产物。腐蚀产物可以溶于或不溶于水溶液。不溶性腐蚀产物（ICP）可能会对有关金属的腐蚀动力学产生深远影响。在这项研究中，提出了一种多相场公式来研究ICP形成对点蚀动力学的影响。金属电解质不溶腐蚀产物系统的吉布斯自由能由化学能，梯度能和电迁移自由能组成。通过实验结果验证了该模型，并提出了几种具有代表性的案例，包括ICP孔隙率，沉积不足腐蚀，敏化合金腐蚀以及与微观结构有关的点蚀的影响。