This document specifies the principle,reagents,testing apparatus,specimens,test conditions and procedures,calculation of test results,test reports for the determination of surface chromium on electrolytic tinplate by colorimetry and electrolyty.
This document is applicable to the determination of surface chromium on electrolytic tinplate.Colorimetry is used as an arbitration method.Electrolyty is recommended as a rapid method for the determination of surface chromium of not less than 2 mg/m2.
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This document specifies test principles,reagent,test apparatus,samples,test conditions and procedures,calculation of test results,test report for the determination of the surface oil in electrolytic tinplate by solvent extraction method,hydrophil balance method and elliptically polarized light method.
This document is applicable to the determination of surface oil in electrolytic tinplate.It may also applies to the determination of surface oil in electrolytic tinplate chromium plate (TFS).The solvent extraction method is used as arbitration method .
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本文件给出了低合金钢耐大气腐蚀的三种评估方法。方法一为基于钢短期腐蚀数据的预测方法;方法二为基于钢化学成分的预测方法;方法三为基于环境因素和钢化学成分的预测方法。
本文件中方法一适用于利用特定级别低合金钢在不同环境中已有的短期大气腐蚀数据,对其长期腐蚀损失进行评估;方法二适用于基于耐蚀性指数(I)对低合金钢的相对耐蚀性能进行评估;方法三适用于对低合金钢在不同环境下不同时间的腐蚀损失进行估算。
注:这三种方法是基于平板裸钢暴露试样的试验数据计算得到的。当低合金钢长时间处于湿润状态,或者被一些盐类或其他腐蚀化学物质严重侵蚀时,则实际大气腐蚀速率就会高很多。
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