Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract: The influence of short-term storage in dry atmosphere on the corrosion behavior of copper was investigated by means of potentiodynamic polarization, electrochemical impedance spectroscopy, capacitance measurement and array electrode technique. It was found that the surface film on copper presented a p-type semiconductor structure, and the carrier concentration decreased after short-term storage. At the same time, the corrosion potential increased, the corrosion current density decreased, and the surface film inhibited both the cathodic and anodic process. Copper displayed the typical characteristics of localized corrosion beneath a NaCl droplet. After storage, the wet-ability, the corrosion activity as well as the overall average corrosion intensity are reduced, but the local corrosion intensity enhanced.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: Inhibition performance of a complex inhibitor of bis-quaternary ammonium and thiourea (with mass fraction 1∶1) for the serious corrosion of P110 steel in simulated oilfield produced waters was studied by means of techniques of mass loss, electrochemical frequency modulation (EFM) and coupled multielectrode array sensors (CMAS). Experimental results indicate that this inhibitor could inhibit P110 steel from CO2 corrosion efficiently. The inhibition efficiency was up to 95.31% when the concentration of inhibitor was 150 mg/L at 60 ℃. The inhibition efficiency decreased at 90 ℃, however, the inhibitor could eliminate the pitting corrosion of P110 efficaciously. EFM and CMAS techniques could monitor the corrosion process of the steel and evaluate the effectiveness of the inhibitor. The deviation from theoretical value of causality factor of EFM could reveal the effectiveness of the addition of inhibitor, i.e. the inhibitor could protect P110 from pitting corrosion. The results of CMAS showed that the prevention of pitting corrosion could be attributed to the adsorbing of inhibitor on the steel surface to relieve the concentrated distribution of cathodic and anodic currents.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract: Corrosion behavior of carbon steel beneath seawater droplets was investigated by using the wire electrode technique (WBE). It was found that anodic and cathodic current decreased gradually with the increasing time, then eventually kept stable. Furthermore, the current distribution over the WBE surface beneath seawater droplets of different sizes was studied. Beneath a smaller droplet, the carbon steel was more easily to form an asymmetric electrochemical area. In addition, a concept of droplet spreadability was defined. The average current density increased exponentially with the increasing droplet spreadability, the maximum value and the standard deviation of the anodic current density increased linearly, at the same time, the corrosion intensity enhanced.