结构材料在海底泥土区腐蚀破坏机制的研究

The corrosion break down behavior of low alloy marine steel was studied in the complex corrosion envioronment of seabottom mud. The corrosion rate of low alloy steel in seabottom mud with Sulfate Reducing Bacteria (SRB) is higher than that in seawater and the corrosion rate also increases with the increase of seabottom mud granurity. Couple corrosion can occur as a result of above effect. The existence of SRB in seabottom mud accelerates the corrosion of marine steel, increases the Stress Corrosion Cracking sensitivity and reduces the fatigue life of marine steel under corrosion and applied cathodic potential. The accelerating effect of SRB on corroion break down maybe explained as the consequences of the acceleration of SRB on corrosion rate and hydrogen entry into the metal. The achievements and conclusions obtained may act as theoretical foundation for corrosion break down monitoring, marine engineering design and effect corrosion protection.

海底泥土区是海洋腐蚀环境中最复杂的部分之一，也是海工设施承受负荷最大的区域。研究钢在海底泥土区的腐蚀破坏机制对于揭示这一区域各种复杂因素交互作用造成的腐蚀破坏的本质有重要意义。本项目主要通过对结构材料在典型海底泥土腐蚀行为的系统研究，探索钢在该区的腐蚀破坏机制，为海上防腐蚀工程设计提供理论基础。