Effect of Stress Magnitude on Pit Growth Rate of 304 Austenitic Stainless Steel in Chloride Environments

Jeong, Jichai; Jeong, Chaewon; Kim, Yun-Jae; Jang, Changheui

doi:10.3390/met11091415

Cited by 2 publications

(1 citation statement)

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“…This also resulted in a concentration difference within the gap from t all solution environment [25,34].The gap kept expanding. After 7 d of corrosion 8c, g), the gap gradually evolved into a teardrop-shaped etch pit [35]. The Cl-co tion in the gap reached a maximum of 260 ppm and the pH dropped to a minimu At this point, the gap expanded at an increasingly rapid rate.…”

Section: Simulation Of the Corrosion Processmentioning

confidence: 99%

A Study of the Mechanisms and Kinetics of the Localized Corrosion Aggravation of Ductile Iron in a Harsh Water Quality Environment

Wang

Liu

Tao

et al. 2022

Metals

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Ductile iron is a high-strength cast iron material. The spherical graphite obtained by inoculation treatment effectively improves the mechanical properties of cast iron, resulting in higher strength than carbon steel. However, severe corrosion may occur under specific circumstances, especially in thermal water pipelines. In this paper, the corrosion mechanisms at the main defective points of ductile iron were investigated using microscopic morphological characterization after accelerated tests combined with numerical simulations. The influence law of each environmental factor on the corrosion kinetics of ductile iron in a complex water quality environment was studied using dynamic potential polarization tests. The results showed that the main causative factors leading to the increased corrosion of ductile iron were the presence of tail-like gaps on its surface, and the crescent-shaped shrinkage and loosening organization around the graphite spheres. After mechanical treatment was applied to eliminate the obvious defects, the number of corrosion pits was reduced by 41.6%, and the depth of the pits was slowed down by 40% after five days. By comparison, after ten days, the number of pits was reduced by 51%, and the depth of the pits was slowed down by 50%. The dynamic potential polarization test results show that the dissolved oxygen concentration has the greatest influence on the corrosion of ductile iron in the simulated water environment; meanwhile, the water hardness can slow down the corrosion of ductile iron. The relative influence of each environmental factor is as follows: dissolved oxygen concentration > temperature > immersion time > water hardness > pH > Cl−.

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Section: Simulation Of the Corrosion Processmentioning

confidence: 99%