|Table of Contents|

Study on corrosion morphology and tensile properties of Q345qDNH steel after corrosion(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年05期
Page:
115-124
Research Field:
建筑材料
Publishing date:

Info

Title:
Study on corrosion morphology and tensile properties of Q345qDNH steel after corrosion
Author(s):
YUAN Zhuoya1;  WANG Xixi2;  YUAN Yangguang1; 3;  ZHAI Xiaoliang1;  YANG Fei4;  HOU Xu1;  XIE Taoye3
(1. CCCC First Highway Consultants Co., Ltd., Xi'an 710068, Shaanxi, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 4. College of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
Q345qDNH steel;  corrosion morphology;  tensile property;  experimental study
PACS:
TU317
DOI:
10.19815/j.jace.2024.03040
Abstract:
In order to investigate the macroscopic and microscopic corrosion morphology of Q345qDNH steel and to determine its tensile properties after corrosion, the corrosion tests were conducted in weak acid and natural exposure environments to analyze the macroscopic corrosion morphology. The industrial CT scanning and energy-dispersive spectroscopy(EDS)were employed to observe the microscopic morphology and surface corrosion product composition, elucidating the corrosion resistance mechanism of steel. The tensile tests were performed on Q345qDNH steel specimens in four different corrosion states to obtain stress-strain curves throughout the process and study the influence of corrosion on elastic modulus and tensile properties. The results show that Q345qDNH steel initially forms orange-yellow corrosion products in weak acid environments, gradually transitioning to black-brown. Under natural exposure, the predominant corrosion product is orange-yellow. The weight loss rate approximately follows a linear increase with time. Under weak acid conditions, the microscopic corrosion morphology of Q345qDNH steel changes from granular to loose and porous over time. Early-stage corrosion products show the development of γ-FeOOH, with an increase in granular oxide particles and the generation of α-FeOOH in later stages. Under natural exposure, early-stage microscopic corrosion morphology appears loose and granular, with the presence of γ-FeOOH in the corrosion product. As corrosion progresses, Fe and O content in surface corrosion products initially fluctuate before stabilizing, while alloy element content shows an overall decreasing trend. Cr redistributes within the corrosion product during the corrosion process. Initially, there is minimal change in the deformation resistance of Q345qDNH steel. However, as corrosion deepens, both yield strength and tensile strength exhibit a linear decline, with similar rates of decrease. Ductility decreases significantly in the early stages of corrosion but stabilizes later. Formation of a dense and stable rust layer in typical atmospheric conditions takes approximately 1.3 years for Q345qDNH steel. When a dense and stable rust layer forms, the steel's deformation resistance decreases by 8.21%, while yield strength and tensile strength decrease by 4.6% and 4.5% respectively compared to initial conditions. Additionally, elongation after fracture and maximum plastic elongation decrease by 35.1% and 15.1% respectively compared to initial conditions.

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Last Update: 2025-09-25