1 Yinshan Section Steel Corporation of Laiwu Steel Group Ltd., Jinan 271104, Shandong, China 2 School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, China
pH-dependent corrosion initiation behavior induced by inclusions of low alloy steel in simulated marine environments
1 Yinshan Section Steel Corporation of Laiwu Steel Group Ltd., Jinan 271104, Shandong, China 2 School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, Shandong, China
摘要 The initial pitting corrosion behavior triggered by inclusions in S420 low alloy steel in acidic artificial seawater (ASW) and weak-alkaline ASW was characterized. The geometric data of the corrosion pits formed in the ASW with different pH were calculated. The pH of the ASW has an obvious influence on the pit shape. The pits in acidic ASW exhibit a funnel shape, while those in weak-alkaline ASW present a cone shape with a larger pit volume. The reason for the difference in the morphology and size of the corrosion pits induced by inclusion is that it is easier to trigger micro-galvanic corrosion in different structures and different areas of the pits in the acidic environment.
Abstract：The initial pitting corrosion behavior triggered by inclusions in S420 low alloy steel in acidic artificial seawater (ASW) and weak-alkaline ASW was characterized. The geometric data of the corrosion pits formed in the ASW with different pH were calculated. The pH of the ASW has an obvious influence on the pit shape. The pits in acidic ASW exhibit a funnel shape, while those in weak-alkaline ASW present a cone shape with a larger pit volume. The reason for the difference in the morphology and size of the corrosion pits induced by inclusion is that it is easier to trigger micro-galvanic corrosion in different structures and different areas of the pits in the acidic environment.
Heng Ma,Zhong-xue Wang,Yue Liu, et al. pH-dependent corrosion initiation behavior induced by inclusions of low alloy steel in simulated marine environments[J]. Journal of Iron and Steel Research International, 2023, 30(10): 2067-2079.
2023, Vol. 30 
