Effect of pH Value on Corrosion Behavior of Q235 Steel in an Artificial Soil

doi:10.11902/1005.4537.2015.049

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (1): 31-38 DOI: 10.11902/1005.4537.2015.049

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Effect of pH Value on Corrosion Behavior of Q235 Steel in an Artificial Soil

Tao HUANG¹,Xiaoping CHEN¹(

),Xiangdong WANG¹,Fengyi MI¹,Rui LIU²,Xiangyang LI¹

1. Division of Engineering Steel,Central Iron and Steel Research Institute, Beijing 100081, China
2. School of Material Science and Engineering, Kunming University of Science and Technology,Kunming 650093, China

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Abstract

Coupons of the grounding material Q235 steel were buried in an artificial soil of diatomite with different pH values for 20 d, and then the corrosion behavior of the steel was examined. The results indicated that the pH value of the artificial soil had a great effect on the corrosion behavior of Q235 steel. With the increasing of pH value, the corrosion rate of the steel in the artificial soil decreased, which accorded fairly well with that in the actual soil, correspondingly the corrosion type of the coupons turned from rather serious uniform corrosion to slight local corrosion. The corrosion products formed in acidic artificial soil are consistent with those in an alkaline artificial soil, they all composed mainly of α-FeOOH, Fe₃O₄, γ-FeOOH and Fe₂O₃, however the products in the late case contained higher Fe₃O₄ and less α-FeOOH.

Key words: soil corrosion artificial soil Q235 steel pH value

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	Tao HUANG
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	Rui LIU
	Xiangyang LI

Cite this article:

Tao HUANG,Xiaoping CHEN,Xiangdong WANG,Fengyi MI,Rui LIU,Xiangyang LI. Effect of pH Value on Corrosion Behavior of Q235 Steel in an Artificial Soil. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 31-38.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.049 OR https://www.jcscp.org/EN/Y2016/V36/I1/31

Fig.1 Corrosion morphologies of Q235 steel in artificial soils with pH=4.5 (a, d), pH=5.5 (b, e), and pH=8.5 (c, f) for 5 d (a~c) and 20 d (d~f)

Fig.2 SEM images of corrosion products of Q235 steel corroded in artificial soils with pH=4.5 (a, b), pH=5.5 (c, d) and pH=8.5 (e, f) for 20 d

Fig.3 EDS spectra of corrosion products of Q235 steel corroded in artificial soils with pH=4.5 (a), pH=5.5 (b) and pH=8.5 (c) for 20 d

Table 1 Rust layer coverage, mass loss and maximum pitting depth of Q235 steel after corrosion in artificial soils with different pH values

Fig.4 XRD patterns of corrosion products of Q235 steel immersed in artificial soils with pH=4.5 (a), pH=5.5 (b) and pH=8.5 (c) for 20 d

Fig.5 Contents of various corrosion products of Q235 steelimmersed in artificial soils with different pH values for 20 d

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