船舶结构钢海洋环境点蚀模型研究之一:最大点蚀深度时变模型

Pitting corrosion model of mild and low-alloy steel in marine environment-Part 1: Maximum pit depth

腐蚀是导致老龄船舶结构失效的主要原因之一。结合基本点蚀原理,本文对碳钢、低合金钢海水全浸带点蚀的主要影响因素、具体点蚀进程做了简要解释与评述。针对我国船舶结构常用碳钢、低合金钢的实海腐蚀试验观测数据建立了新型Weibull函数形式的点蚀最大深度模型。通过对比验证,证明采用Weibull函数表示点蚀最大深度随时间变化关系是合适的。

Corrosion is one of the main reasons which causing structure failure and damage.For mild and low-alloy structural steels under marine immersion conditions,the main influencing factor and the specific process of pitting corrosion were summarized in this paper,according the pitting corrosion mechanics and various corrosion data from some long-term field investigations.The new maximum pit-depth model described by weibull-function was also given here,which will be more precisely to predicting the statistical characteristics of maximum macro-pit depth.By contrasted with other pitting corrosion models,it will be reasonable to describe the maximum pit-depth curve of mild and low-alloy steel as a weibull function varying with exposure period.