Flow‐accelerated corrosion behavior of SA106 Gr. C weldment

Abstract

Chemical and geometrical effects of weld on flow-accelerated corrosion (FAC) of SA106 Gr.C low alloy steel pipe was investigated using rotating cylinder electrode in 3.5-wt% sodium chloride solution and simulated feedwater of nuclear power plants. Polarization tests and weight loss tests were conducted at rotating speed of 2000 rpm (3.14 m/s) with variation of chemical and geometric parameters. The results showed that the chemical effects were relatively larger than the geometrical effects, and the welded parts became local anode and preferentially corroded, which was explained by the differences between microstructural and compositional parameters. On the other hand, under active corrosion conditions, the heat affected zone was severely corroded and microstructural effects were dominant.

The Effect of Jet Flow Impingement on the Corrosion Products Formed on a Pipeline Steel in Naturally Aerated Sour Brine

“…A similar effect has been reported with the continuous dissolution of ferrite in pearlite region, in which cementite between two lamellas may be undermined and stripped off the pearlite region. This leads to the aspect of grooves on the metal surface [42,43], which coincides with the images shown at 1500X in Figs. 11c and 12c.…”

Characterization of oxides on FAC susceptible small-bore carbon steel piping of a power plant

“…This failure according to the researchers ''appeared to have been initiated at or near the upstream weld''. Kim et al [25] have investigated chemical and geometric effects of a weld on FAC in SA 106 Gr. C low alloy steel, and reported that the steel in the HAZ was severely corroded.…”

Corrosion behavior of WB36CN1 steel at different flow rates

“…Meanwhile, the secondary circuit environment involves high temperature and high pressure, the research method for metal corrosion is relatively difficult. Most research methods and experimental conditions cannot reflect the corrosion process of steel pipes in actual working conditions, which limits the development of such research (Kim et al , 2015; Xu and Tan, 2018). In this paper, the effects of different flow rates on the corrosion behavior of WB36CN1 steel in high temperature fluids were explored by electrochemical noise, electrochemical impedance spectroscopy and scanning electron microscope (SEM).…”