|Table of Contents|

Experimental Study on Stress Corrosion Characteristics of Steel Q420qD(PDF)

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

Issue:
2022年01期
Page:
55-64
Research Field:
钢结构
Publishing date:

Info

Title:
Experimental Study on Stress Corrosion Characteristics of Steel Q420qD
Author(s):
ZHANG Su-mei1;  CHEN Guang-rui1;  LI Ai-dong2;  GUO Xian-zhao2;  ZHANG Lei2;  GUO Lan-hui3
(1. School of Civil and Environmental Engineering, Harbin Institute of Technology(Shenzhen), Shenzhen 518055, Guangdong, China; 2. China Railway Design Group Co. Ltd., Tianjin 300308, China; 3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150010, Heilongjiang, China)
Keywords:
steel Q420qD;  stress corrosion;  corrosion rate;  surface morphology;  fractal dimension;  pit depth;  diameter to depth ratio
PACS:
TU511.3
DOI:
10.19815/j.jace.2020.11052
Abstract:
To investigate the stress corrosion characteristics of steel Q420qD, totally 60 specimens under 0.3 times of the yield stress and no stress conditions were tested by accelerated corrosion of electricity respectively in the same corrosive environment. Afterward, the corrosion rate model of the specimens was established and compared. The 3D surface topography on some selected corroded specimens were scanned, and the morphology development law of the stressed and unstressed specimens, the distribution law of pit depth, the shape of pits and the law of diameter to depth ratio were analyzed. The fractal dimension of the corrosion surface was calculated by differential box counting method, and its variation law was analyzed and compared with mass loss rate and corrosion age of stressed and unstressed specimens. The results show that when the stress of the specimen is 0.3 times of the yield stress, the corrosion rates of the stressed and unstressed specimens develop faster in the initial stage and then slow down. Before the target corrosion rate reaches 18%, the corrosion rate is approximately keeping constant, while the corrosion rate of the stressed specimen is approximately 1.15 times faster than that of the unstressed specimen. The corrosion morphology of stressed specimens develops faster than that of unstressed specimens, and the final corrosion pattern is dominated by uniform corrosion. The fractal dimension on the surface of stressed or unstressed specimens has similar change rules, and they all show a rapid increase at the beginning stage, then in a general slow-down trend with periodic upward and downward fluctuations. The development of fractal dimension of stressed specimen is higher than that of unstressed specimen at the initial stage of corrosion, and the fractal dimension of the stressed specimen is generally higher than that of unstressed specimen. The shapes of the corrosion pits are mainly spherical crowns, and the pit depth distributions of stressed and unstressed specimens obey the normal distribution law. The variation range of diameter to depth ratio of pits is stably distributed between 2 and 6 with an average value around 4.

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Last Update: 2021-02-10