目前油气井CO2腐蚀研究中按国际标准NACE RP0775-2005计算金属平均腐蚀速率的方法,一般不考虑测试时间长短对测试结果的影响,将短期内的单次测试结果按照线性规律外推至1年时,对腐蚀速率有较明显的放大作用.所得短期测试结果可以用于对比不同材料间的耐均匀腐蚀特性,但不宜作为材料寿命预测及防腐蚀选材设计的依据.由于受工程项目设计时间和腐蚀测试设备性能的制约,难以实现长周期(半年以上)的模拟试验测试.为此,对长至1年的金属平均腐蚀速率的计算方法进行了改进,给出了考虑腐蚀测试时间效应的建议算法,并结合设计实例验证了其可靠性.
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