金属和合金的腐蚀.镁合金抗应力腐蚀开裂性的测定

[中文适用范围]： 本文件规定了用于结构应用（例如镁前端、变速箱和离合器壳体单元、转向柱零件、换档执行器、阀盖和壳体）的镁合金的抗应力腐蚀开裂（SCC）能力的测定方法、支架和进气歧管叶片、电子设备、电动工具和医疗设备）。 该方法可以确定作为镁合金化学成分、制造方法和热处理函数的抗应力腐蚀开裂性。 该文件适用于铸件、半成品、零件和焊件形式的铸造和变形镁合金，涵盖了取样方法、试样类型、加载程序、环境类型和结果解释。 该文件允许评估材料和产品在含有氯化物或硫酸盐的环境中的相对性能，前提是失效机制没有改变，但不符合材料或产品的服务应用资格。 [外文原描述]： This document specifies a method for the determination of resistance to stress corrosion cracking (SCC) of magnesium alloys intended for use in structural applications (such as magnesium front end, gearbox and clutch housing units, steering column parts, shift actuators, valve covers and housings, brackets and intake manifold blades, electronic devices, power tools and medical equipment). The method allows determination of the resistance to SCC as a function of the chemical composition, the method of manufacture and heat treatment of magnesium alloys. The document is applicable to cast and wrought magnesium alloys in the form of castings, semi-finished products, parts and weldments and covers the method of sampling, the types of specimens, the loading procedure, the type of environment and the interpretation of results. The document allows assessment of the relative performance of materials and products in environments containing chlorides or sulphates, provided that the failure mechanism is not changed, but does not qualify a material or product for service application.