Corrosion Of Q235 Carbon Steel Research Articles

Molybdate-based corrosion inhibitor system for carbon steel in sea ice melt-water

abstract Because Bohai Sea is located at a higher latitude in China, there is huge amount of sea ice formed every winter that has brought about great attention to the value and utilization of the sea ice. To replace fresh water by the sea ice melt-water for industrial cooling and to reduce water shortage within the area of Bohai Sea, circulation system shall be of great positive significance. By orthogonal experiment screening, together with the molybdate-based multiple inhibitor system, the effects of corrosion inhibitor of molybdate compound in the sea ice melt-water on the corrosion of Q235 carbon steel were studied by using weight-loss method on static immersion suspension, rotation specimen method, and polarization curve method; and the inhibition of this formula in high cycles of concentration (2–5 times) of the sea ice melt-water was evaluated. The results show that in single usage of molybdate dosing lower than 30 mg/L, it can accelerate corrosion of carbon steel. Molybdate presents good synergist...

Steel Bar Corrosion Monitoring by Potentiostatic Pulse Method

Steel bar corrosion monitoring is a very important part of structure health monitoring and full-life design in civil engineering. Many electrochemical methods have been developed in the last decades for corrosion research, but for field corrosion, pulse perturbation is the fast method. The corrosion of Q235 carbon steel in cement mortar has been researched by potentiostatic pulse method. The solution resistance Rs, the polarization resistance Rp, capacity of double layer and time constant have got by cure fitting. The amplitude of voltage perturbation affected the accurate of result little. The polarization resistance decreases with increasing temperature.