摘要
对A3钢在模拟海泥环境中进行了埋片试验和电化学试验,以研究海底管道在含硫酸盐还原菌(SRB)海泥中的腐蚀行为。结果表明,A3钢在砂泥中的腐蚀速率明显高于在海砂中的腐蚀速率,随温度的升高,A3钢在海砂中的腐蚀速率升高;且随温度的升高、SRB和SO42-含量的增加,A3钢在砂泥中的腐蚀速率随之升高;在无菌海泥中A3钢的腐蚀速率随温度升高而增大,主要是由于作为阴极去极化剂的氧的扩散速度随温度升高而增大;在有菌海泥中SO42-能参与阴极去极化而加速A3钢的腐蚀。
The corrosion rate of seabed pipeline in sea mud was studied by weight-loss experiments and electrochemical measurements with A3 steel in simulated sea mud. The results showed that the corrosion rate of A3 steel in sandy soil was significantly higher than that in sea sand. The corrosion rate of A3 steel in sea sand increased with the increase of temperature. With the increase of SRB and SO4^2-, the corrosion rate of A3 steel increased in sandy soil. The increase of corrosion rate of A3 steel in marine mud without SRB with the increase of temperature was mairdy due to the increase of diffusion rate of oxygen as a depolarizing agent of cathode. SO4^2- could participate in the cathodic depolarization and accelerate the corrosion rate of A3 steel in sea mud with SRB.
出处
《腐蚀与防护》
CAS
北大核心
2009年第2期99-101,109,共4页
Corrosion & Protection
