热带海岛大气环境下Q235钢的腐蚀规律及GM(1,1)模型预测

doi:10.11896/cldb.24070041

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Abstract The corrosion of Q235 steel is a problem that can not be ignored in tropical island areas such as Hainan Island and the South China Sea Islands. Through natural exposure test, accelerated tests by spraying water mist and salt mist with mass fractions of 3.1% and 5%, adopting the methods including macroscopic morphology observation, SEM, EDS, XRD, corrosion weight loss and tensile tests, the corrosion law of Q235 steel in tropical island atmospheric environment was studied, and the mechanical properties of corroded steel were analyzed and predicted based on the GM(1, 1) model. The results show that the color and structural form of corrosion rust layer of Q235 steel vary for those under different conditions. Water mist exacerbates the crack expansion at the interface between the rust layer and the substrate, while salt mist destroys the compactness of the rust layer and accelerated its cracking progress. The law between corrosion depth of Q235 steel and time follows a power function. Salt mist has a greater accelerating effect on corrosion mass loss than water mist. After corrosion for 12 months, the degradation degrees of mechanical properties including yield strength, tensile strength and elongation after fracture of Q235 steel ranges from low to high are under natural exposure, water mist and salt mist conditions sequentially. The GM(1, 1) model exhibits a well accuracy in predicting the degradation of mechanical properties of corroded steel. The degradation rates of mechanical properties decrease gradually and level off with time under all test conditions. The degradation degree and rate of yield strength, tensile strength and elongation after fracture under natural exposure condition are significantly lower than those under other conditions. The degradation degree of elastic modulus with time under natural exposure and water mist conditions is similar, while they are significantly lower than those under salt spray conditions.

Key words： Q235 steel tropical island atmospheric environment corrosion morphology corrosion weight loss mechanical property degradation prediction model

Published: 15 August 2025 Online: 2025-08-15

CLC number:

TU5111.3

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	QIN Shujie
	WANG Xin

Cite this article:

QIN Shujie,WANG Xin. Corrosion Law and GM(1,1) Model-based Prediction of Q235 Steel in Tropical Island Atmospheric Environment[J]. Materials Reports, 2025, 39(16): 24070041-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24070041 OR https://www.mater-rep.com/EN/Y2025/V39/I16/24070041

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