Abstract:

In order to investigate whether magnetic treatment and 2-mercaptobenzothiazole (MBT) have synergistic effect on corrosion inhibition, corrosion rate of red copper was measured under different treatment conditions by weight loss method. The treatments included permanent magnetic field, alternative magnetic field, corrosion inhibitor MBT, and combination of MBT and magnetic field. Mechanism of corrosion inhibition was studied with assistance of SEM, XRD and ATR-FTIR. The results showed that permanent magnetic field had little effect on corrosion inhibition, but alternative magnetic field had some improvement on corrosion inhibition by forming compact oxide film on copper surface. Alternative magnetic field reduced water polarity and gave water molecules power and activity, which increased MBT solubility in water and adsorbance on copper surface. Therefore, combination of alternative magnetic field and MBT has synergistic effect on corrosion inhibition. To achieve same corrosion inhibition effect as MBT itself, synergistic effect could decrease MBT usage by 60%. Because MBT is dissolved in NaOH solution, less MBT will reduce alkali consumption and lower conductivity of cooling water in power generator.

Key words: alternating magnetic field, corrosion inhibitor, corrosion, surface, adsorption

摘要：

为了考察磁处理与缓蚀剂2-巯基苯并噻唑（MBT）是否具有协同缓蚀作用，采用腐蚀失重法，测试了恒磁场、交变磁场、缓蚀剂MBT以及磁处理与MBT结合作用下紫铜挂片的腐蚀速率，并通过SEM、XRD、ATR-FTIR等分析方法研究了缓蚀作用机理。研究结果表明恒磁场缓蚀作用较小，而交变磁场具有一定缓蚀作用，其缓蚀机理是生成致密氧化物膜覆盖在金属表面。交变磁场能够降低水分子的极性，给水分子以能量和活性，从而增加了有机缓蚀剂MBT在水中的溶解度，在铜片上吸附的MBT量也相应增加了，因此，交变磁场与MBT具有协同缓蚀作用。达到同等缓蚀效能，协同作用可使得MBT用量减少60%。由于MBT是溶解在氢氧化钠溶液中，用量少则引入的碱含量随之降低，客观上降低了发电机内冷液的电导率。

关键词: 交变磁场, 缓蚀剂, 腐蚀, 表面, 吸附