Corrosion Behavior of 304L Steel in Nitric Acid Environment

doi:10.11902/1005.4537.2017.175

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (5): 455-462 DOI: 10.11902/1005.4537.2017.175

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Corrosion Behavior of 304L Steel in Nitric Acid Environment

Xiaoyan ZHAO, Xiwu LIU, Xin'an CUI(

), Fengchang YU

Luoyang R&D Center of Technology Sinopec Engineering (Group) CO., LTD., Luoyang 471003, China

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Abstract

Corrosion behavior of 304L stainless steel was investigated in the liquid and steam of 2%~20% (mass fraction) nitric acids at 80~135 ℃ by coupon immersion test. The surface morphology of specimens after corrosion test and the depth of intergranular corrosion were examined by SEM and metallographic microscope, respectively. Results showed that the corrosion rate of 304L stainless steel first increased slowly and then increased sharply with the increase of temperature or nitric acid concentration. Correspondingly, the corrosion form of the steel converted from uniform corrosion to intergranular corrosion. The influence of temperature and nitric acid concentration on the corrosion of 304L stainless steel in nitric acid steam was higher than that in nitric acid solution, while the steel is more likely suffered form intergranular corrosion in nitric acid steam. The degree of intergranular corrosion in nitric acid steam was more serious than that in nitric acid solution. With the increase of corrosion, breaking and falling off of grains on the surface of 304L stainless steel occurred, resulting in thinning in thickness of the material.

Key words: austenitic stainless steel nitric acid transpassive state intergranular corrosion

Received: 25 October 2017

ZTFLH:

TG172.6+3

Fund: Supported by Sinopec Scientific Research Project (315108)

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Cite this article:

Xiaoyan ZHAO, Xiwu LIU, Xin'an CUI, Fengchang YU. Corrosion Behavior of 304L Steel in Nitric Acid Environment. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 455-462.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.175 OR https://www.jcscp.org/EN/Y2018/V38/I5/455

Fig.1 Corrosion rates of 304L stainless steel in 8% (a) and 20% (b) nitric acid environments at different temperatures

Fig.2 SEM images of 304L stainless steel after corrosion in the solution (a, c, e, g) and steam (b, d, f, h) of 8% nitricacid at 80 ℃ (a, b), 100 ℃ (c, d), 120 ℃ (e, f) and 135 ℃ (g, h)

Fig.3 SEM images of 304L stainless steel after corrosion in the solution (a, c, e, g) and steam (b, d, f, h) of 20% nitricacid at 80 ℃ (a, b), 100 ℃ (c, d), 120 ℃ (e, f) and 135 ℃ (g, h)

Fig.4 Section micrographs of 304L stainless steel after corrosion in the solution (a) and steam (b) of 20% nitric acid at 135 ℃

Fig.5 Variations of corrosion rate of 304L stainless steel with nitric acid concentratio in two different environments at 135 ℃

Fig.6 SEM images of 304L stainless steel after corrosion in the solution (a, c, e, g, i) and steam (b, d, f, h, j) of 2% (a, b), 4% (c, d), 8% (e, f) and 16% (g, h) nitric acid at 135 ℃

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