Abstract
A multi-electrode array sensor was developed to study the corrosion behaviors of carbon steel weldments and the effectiveness of the NaNO2 inhibitor in carbonated pore solution. The sensor can simulate a complete weldment, and the measurement results can match well with the coupon immersion test. The galvanic corrosion between the weld area, heat-affected area, and base metal area, as well as the effect of nitrite corrosion inhibitor on the weld area, were observed by measuring the open circuit potential, coupling potential, and galvanic current. The results show that corrosion is likely to happen around the weld metal area and its adjacent heat-affected zone. The intensive galvanic currents can accelerate the localized corrosion, while NaNO2 can inhibit it.
Highlights
Reinforced concrete is widely used in various constructions due to its versatility, durable and strong performance throughout its service life [1,2]
Another multi-electrode sensor was designed as a wire beam electrode (WBE) which was applied in the study of localized corrosion [30]
After the inhibitor NaNO2 was introduced into the solution at 60 h, the coupled potential recovered to −250 mV and gradually decreased to −280 mV
Summary
Reinforced concrete is widely used in various constructions due to its versatility, durable and strong performance throughout its service life [1,2]. Yang [29] studied the threshold chloride levels for localized carbon steel corrosion in simulated concrete pore solution by using a newly designed sensor. The threshold level of Cl−/OH− in different pH solutions can be seen from the transfers of the max anodic current Another multi-electrode sensor was designed as a wire beam electrode (WBE) which was applied in the study of localized corrosion [30]. Based on the measurement principle of WBE, the multi-channel electrode sensor was used to study the corrosion behavior of the weldments or other steel structures [35]. The inhibition effect of traditional inhibitor NaNO2 [24] on corrosion of weldments was tested in the simulated pore solution through the observation of the changes of the coupled potential and the galvanic currents among the electrodes. At the initiation of each test, the surfaces of the electrodes and corrosion coupons were degreased with alcohol and rinsed with deionized water
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