Multiscale modelling of the corrosion of metals under atmospheric corrosion
Multiscale modelling of the corrosion of metals under atmospheric corrosion
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DOI：
10.1016/j.electacta.2010.10.025
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发表时间：
2011-01-15
影响因子：
6.6
通讯作者：
Cook, A.
中科院分区：
文献类型：
--
作者：
Cole, I. S.;Muster, T. H.;Cook, A.
本文描述了用于预测大气腐蚀的多尺度（从全局到微米）模型。该模型具有模块化结构，其中较高尺度为较低尺度设置边界条件，较低尺度改变较高尺度中的一些常数。该模型主要是针对澳大利亚的条件而设计的，因此重点关注海洋气溶胶的腐蚀。上层模块着眼于海洋和冲浪海滩的气溶胶产生、盐输送和沉积以及雨和风等清洁事件，以提供表面盐保留的估计。定义表面温度、表面相对湿度以及沉积的吸湿性盐的润湿和干燥的单独模块能够预测表面（每三小时）的“状态”，其中“状态”被定义为干燥、因雨而湿润或因吸湿性盐而湿润。状态模型与损伤模型相结合来估计损伤随时间的进展。目前，损伤模型本质上要么是概率性的（将凹坑的发生、生长或死亡定义为概率函数），要么是经验性的（根据测量数据定义给定状态下质量损失之间的单一关系），但正在开展新的实验和建模研究，以开发已建立的氧化膜下腐蚀的第一原理模型。 Crown 版权所有 (C) 2010 由 Elsevier Ltd 出版。保留所有权利。
This paper describes a multiscale (from global to micron) model for the prediction of atmospheric corrosion. The model has a modular structure, in which the higher scales set the boundary conditions for the lower scales, and the lower scales alter some of the constants in the upper scales. The model has primarily been designed for Australian conditions and so focuses on corrosion by marine aerosols. The upper level modules look at aerosol production by oceans and surf beaches, salt transport and deposition, and cleaning events such as rain and wind, to provide an estimate of salt retention on surfaces. Separate modules that define surface temperature, surface relative humidity, and wetting and drying of deposited hygroscopic salts, enable the prediction of the (three-hourly) 'state' of a surface, where 'state' is defined as dry, wet from rain or wet from the wetting of hygroscopic salts. The state model is combined with a damage model to estimate the progression of damage with time. Currently, damage models are either probabilistic (define the occurrence, growth or death of pits as probability functions) or empirical (define a single relationship between mass loss in a given state on the basis of measured data) in nature, but new experimental and modelling research is being undertaken to develop first-principle models of corrosion under established oxide films. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.