金属材料实验室加速腐蚀环境谱等效加速关系的确定方法

Method for Determining the Equivalent Acceleration Relationship of Accelerated Corrosion Environmental Spectra of Metal Materials

目的解决现有实验室加速环境谱等效加速关系确定方法的不足。方法提出一种针对航空金属材料实验室加速腐蚀环境谱与实际大气间等效关系的“双桥连接式”快速确定方法。结果该方法以金属材料在腐蚀环境下的质量损失情况作为腐蚀当量,通过基于“环境因素加权浓缩”的方法编制实验室加速环境谱、基于“电量(电流)等效桥”获得实际大气环境长年累积腐蚀电量、基于“质量损失等效桥”确定等效加速关系3个步骤,计算获得了实际大气长年监测数据对应的材料累积腐蚀电荷量和腐蚀质量损失大小。通过将金属材料在实际大气下和实验室加速环境下的腐蚀质量损失速率相比,获得了金属材料的等效加速关系。结论该方法能够有效克服现有研究中由于缺少实地长时间大气暴晒件,以及当量参数选取不当引入误差,导致无法获取实验室加速腐蚀环境谱和实际大气环境间等效加速关系(或当量加速关系)的不足,为金属材料实验室加速腐蚀试验提供了方法支撑。

The determination of the equivalent acceleration relationship is an important prerequisite for conducting accelerated corrosion tests in metal materials laboratories.However,the current determination method is greatly limited by experimental conditions and requires a lot of time and labor costs.To address the shortcomings of existing methods for determining the equivalent acceleration relationship of accelerated environmental spectra in laboratories,the work aims to propose a“double bridge connection”rapid determination method for the equivalent relationship between accelerated corrosion environmental spectra in aviation metal materials laboratories and the actual atmosphere.The weight loss of metal materials in corrosive environments was taken as the corrosion equivalent,and laboratory accelerated environmental spectra was compiled based on the method of“weighted concentration of environmental factors”.Based on the“equivalent bridge of electricity(current)”,the actual accumulated corrosion electricity in the atmospheric environment over the years was obtained.Through the three steps of determining the equivalent acceleration relationship based on the“weightlessness equivalent bridge”,the cumulative corrosion charge and corrosion weight loss of materials corresponding to actual atmospheric long-term monitoring data were calculated.By comparing the corrosion weight loss rate of metal materials in actual atmospheric and laboratory accelerated environments,the equivalent acceleration relationship of metal materials was obtained.This method can effectively overcome the shortcomings of existing research in obtaining the equivalent acceleration relationship(or equivalent acceleration relationship)between the laboratory accelerated corrosion environment spectrum and the actual environment due to the lack of on-site long-term atmospheric exposure samples and improper selection of equivalent parameters,providing support for accelerated corrosion test of metal materials in the laboratory.