Inclusion-Induced Corrosion of HY-80N High-Strength Marine Engineering Steel in Simulated Seawater Environment AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY24110031

Chinese Library Classification Number:TG172.5

Citation Information:

This study delved into the comprehensive investigation of the corrosion behavior and mechanisms of high-strength marine engineering steel HY80-N. Utilizing advanced techniques such as optical microscopy （OM）and scanning electron microscopy （SEM），the microstructure of the steel was meticulously examined to identify the presence of inclusions. Subsequent to the microstructural analysis，simulated seawater immersion corrosion tests were conducted at various time intervals，providing a dynamic understanding of the corrosion progression. The corrosion behavior was extensively characterized through a series of electrochemical tests，including impedance measurements，open circuit potential analysis，and polarization curves. Corrosion rates were quantified using the weight loss analysis method，yielding valuable corrosion rate curves that offered insights into the kinetics of the corrosion process. Scanning electron microscopy was employed to provide a detailed study of the initiation of corrosion in simulated seawater. This technique revealed the electrochemical characteristics of inclusions and microstructural features，shedding light on the local corrosion phenomena. Additionally，scanning electron microscopy was utilized to observe and analyze the corrosion morphology，providing a visual representation of the structural changes occurring during the corrosion process. Results from the study unveiled that in the initial stages of corrosion，pitting predominantly occurred around Al₂O₃ inclusions. As corrosion progressed，the extent of corrosion expanded，leading to a proportional reduction in the steel's corrosion resistance. As the immersion time increases，the capacitance loop diameter of marine engineering steel significantly decreased，and the charge transfer resistance （R_ct）value decreased from 2.859 to 1.143 kΩ·cm². The double-layer constant phase element admittance parameter CPE_dl-Y₀ value changed from 7.681×10⁻⁵ to 6.334×10⁻³ sⁿ·Ω⁻¹·cm⁻¹，where s denotes seconds，and n is the dimensionless phase angle exponent of CPE. Generally，the double layer constant phase element CPE_dl value was positively correlated with the quantity and area of pitting corrosion. Therefore，with the increase in immersion time，the surface of marine engineering steel experienced a greater number of pitting corrosion events，leading to a two-order magnitude increase in CPE_dl values. Chloride ions were identified as the main corrosive species on the surface of marine engineering steel，subsequently leading to the formation of localized corrosion microcells，manifested by the decrease in （R₁+R_ct），where R₁ refers to the film resistance. When corrosion products accumulated near the pitting，it tended to weaken the corrosive impact of chloride ions，resulting in a slight increase in R₁. After 12 h of immersion，sporadic peaks in current density were observed as the applied potential exceeded the corrosion potential （E_corr），indicating the initiation of pitting corrosion and an activated state of the material surface. With prolonged immersion，the corrosion potential of marine engineering steel decreased from –451.42 to –478.73 mV，and the corrosion current decreased from 9.51 to 8.58 μA·cm^-2. After 48 h of immersion，the corrosion potential further decreased to –507.59 mV，and the corrosion current increased to 82.77 μA·cm^-2，accompanied by an increase in b_C （cathodic Tafel slope）values. Simultaneously，the passivation region decreased in the polarization curve，and the corrosion current gradually increased. The material was losing its passivation，indicating that pitting had penetrated into the crevice，leading to a significant reduction in the material's corrosion resistance. Three-dimensional morphology analysis illustrated enhanced corrosion around Al₂O₃ inclusions after 12 h of immersion. This enhancement was characterized by deepening pits and a noticeable height difference compared to the surrounding uncorroded areas. This phenomenon was attributed to the accelerated dissolution of the matrix around the Al₂O₃ inclusions. Throughout the entire corrosion process，the inclusions played a detrimental role，acting as accelerators for the corrosion of marine engineering steel. In conclusion，although the marine engineering steel exhibited a uniform grain distribution，the presence of Al₂O₃ inclusions introduced a susceptibility to corrosion in marine environments. Microscopic analysis，coupled with corrosion rate calculations from samples immersed for different durations，highlighted that pitting initiated primarily around the inclusions，expanding as the corrosion process advanced，ultimately compromising the steel's corrosion resistance. The comprehensive analysis involving electrochemical impedance spectroscopy，polarization curves，and three-dimensional morphology emphasized the intricate corrosion mechanisms. Chloride ions were identified as the primary corrosive species，with inclusions initiating pitting and forming localized corrosion cells. The findings underscored the detrimental impact of inclusions on the corrosion resistance of marine engineering steel throughout the entire corrosion process，providing valuable insights for the development of corrosion-resistant materials in marine applications.