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采用电化学实验及SEM和EDS分析技术,研究了B10合金分别在无菌和接种了远青弧菌、硫酸盐还原菌(SRB)以及二者混合菌种的海水中的腐蚀行为.结果表明,不同海洋微生物条件下B10合金的腐蚀行为及机制有所不同.远青弧菌通过阻滞氧去极化阴极过程在一定程度上抑制B10合金腐蚀;SRB则通过氢去极化使阳极溶解加速,而生成的粗大颗粒状腐蚀产物Cu2S对基体的保护性不佳,促进了B10合金的腐蚀;而在混合菌种条件下,B10合金腐蚀的阴极过程与仅接种SRB时相似,但阳极溶解形成的腐蚀产物比后者细小且致密均匀,使其阳极极化显著增大,阻滞了试样的进一步腐蚀,其腐蚀电流密度介于2种单一菌种之间.因此在工程实践中,根据实验室单一菌种条件下材料的腐蚀行为来估计和预测在实际微生物环境中材料的腐蚀行为时宜慎重.
The corrosion behavior of B10 alloy in seawater with sterile and inoculation of V. farinae, sulfate-reducing bacteria (SRB) and their mixed bacteria was studied by means of electrochemical experiments and SEM and EDS analysis, respectively. The results showed that, The corrosion behavior and mechanism of B10 alloy are different under different marine microorganisms.Variant arbuscular mycorrhizal can inhibit the corrosion of B10 alloy to a certain extent by retarding oxygen depolarization cathode process; SRB accelerates anodic dissolution through hydrogen depolarization, However, the Cu2S produced by the coarser grainy corrosion products did not protect the substrate and promoted the corrosion of the B10 alloy. However, the cathode process of the corrosion of the B10 alloy was similar to that of the B10 alloy only when mixed with SRB, but the anodic dissolution The corrosion products are smaller and denser than the latter, which results in a significant increase of anodic polarization, which hinders the further corrosion of the samples, and the corrosion current density is between two single species. Therefore, in engineering practice, Room corrosion behavior of a single species of bacteria to estimate and predict the material in the actual microbial environment Corrosion behavior should be careful.