The authors respectively studied that the changing of HPAM tocorrosion inhibiting ability of A3 steel in water when the concentration of partial hydrolysis HPAM,temperature of sulution,molecular weight of HPAM and the mineralization solution change and analyses the cause of these changes.%采用动、静态挂片失重法及pH、氧含量和粘度测量等多种试验方法，分别研究了部分水解聚丙烯酰胺(HPAM)的浓度、溶液的温度、HPAM的分子量及溶液的矿化度等因素改变时，HPAM对A3钢在水中缓蚀能力大小的变化。结果表明，随HPAM浓度增加，其对A3钢的缓蚀率随浓度增加而迅速增加；当HPAM浓度达到一定范围后，其对A3钢的缓蚀率随浓度增加变化不大；随着温度的升高，HPAM对A3钢的缓蚀率下降；随HPAM分子量的减少，HPAM对A3钢在模拟水中的缓蚀作用增强。溶液中阴离子相同的情况下，HPAM在含Ca2+溶液中的缓蚀作用大于含Na+的溶液。
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