不锈钢海水潮汐区16年腐蚀行为

在青岛、厦门和榆林3个试验站的潮汐区对5种不锈钢暴露16年，总结其腐蚀行为和规律。在潮汐区暴露的不锈钢受点蚀和缝隙腐蚀破坏。不锈钢在潮汐区暴露1至4年的点蚀速度较大，以后点蚀速度减慢。耐点蚀性能较好的不锈钢，耐缝隙腐蚀性能也较好。不锈钢在潮汐区的腐蚀随暴露地点的海水温度升高而加重。增加Cr含量、添加Mo能明显提高不锈钢在潮汐区的耐蚀性。Ni对提高的耐蚀性有效，但影响效果较小。海生物污损能引起不锈钢的局部腐蚀，它对不锈钢在潮汐区的腐蚀有显著影响。

CORROSION OF STAINLESS STEELS IN TIDAL ZONE - EXPOSURE TEST FOR 16 YEARS

Corrosion results of 5 types of stainless steels exposed to tidal zone at Qingdao,Xiamen and Yulin Sea area of China were reported.Corrosion behavior and rule of stainless steels in tidal zone was summarized.The stainless steels exposed to tidal zone were attacked by pitting and crevice corrosion.It was found that pitting rates of stainless steels in tidal zone were bigger during 1 to 4 years,after which the pitting rate diminished.The stainless steel that had good pitting resistance in tidal zone possessed good resistance to crevice corrosion.Corrosion rate of stainless steels increased with going up of seawater temperature of test sites.Increasing Cr content and adding Mo can enhance obviously corrosion resistance of stainless steels in tidal zone.Ni improves corrosion resistance,but its improving effect is less.Fouling organism could cause localized corrosion of stainless steels.Effect of the fouling on corrosion of stainless steels in tidal zone was notable.