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利用过氧化氢氧化降解水溶性壳聚糖得到不同分子量梯度的产物，通过端基法测定了产物的数均分子量。在海水体系中，用失重法测定了不同浓度水溶性壳聚糖及其降解产物对低碳钢的缓蚀效率，并用电化学方法和椭圆偏振法分析其缓蚀机理。结果表明：过氧化氢用量的增加有利于降解产物分子量的降低；不同分子量水溶性壳聚糖降解产物浓度为400 mg/L时缓蚀效率最高，且分子量减小有利于缓蚀效率的提高，可达到64.35%；极化曲线实验所得规律与失重实验相符，表明水溶性壳聚糖及其降解产物为阴极型缓蚀剂；椭圆偏振法分析表明，水溶性壳聚糖为多层吸附，且随着分子量的减小，吸附层厚度增厚，缓蚀效率提高。

Water soluble chitosan was degraded to different molecular mass products by hydrogen peroxide at first, and then molecular mass of the degradation products were measured using terminal group analysis method. The inhibitive properties of water soluble chitosan and its degradation products for mild steel were studied by mass loss method and potentiodynamic polarization measurement. The inhibitive mechanisms were analyzed by polarization curves and ellipsometry method. The results show that with the increasing of hydrogen peroxide quantity the degradation products molecular mass were decreased. It was found that the highest inhibition effect of water soluble chitosan and its degradation products was obtained at 400 mg/L and the lower the molecular weight, the higher the inhibition efficiency, which was up to 64.35%. The results of polarization curve method show that the water soluble chitosan and its degradation products have similar inhibition tendency measured by mass loss method and are cathodic corrosion inhibitors. Ellipsometry experimental results indicated chitosan took place multi-layer absorption on carbon steel surface and inhibition film became thicker with molecular mass decreasing. The water soluble chitosan with low molecular mass are green corrosion inhibitor for mild steel in seawater.