Corrosion Behavior of 304L Stainless Steel in Nitric Acid-Sodium Nitrate Solutions

doi:10.11902/1005.4537.2017.196

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (6): 543-550 DOI: 10.11902/1005.4537.2017.196

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Corrosion Behavior of 304L Stainless Steel in Nitric Acid-Sodium Nitrate Solutions

Xiwu LIU,Xiaoyan ZHAO,Xin'an CUI(

),Lanfei XU,Xiaowei LI,Rongqi CHENG

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

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Abstract

The effect of sodium nitrate on the corrosion behavior of 304L in nitric acid-sodium nitrate solutions at 120 and 135^oC respectively was studied by means of immersion test, potentiodynamic polarization curve measurement and corrosion morphology characterization. The result showed that the corrosion of 304L in sodium nitrate solution was very slight. However, the presence of sodium nitrate induced or exacerbated the intergranular corrosion of 304L in nitric acid-sodium nitrate solution. The corrosion of 304L in the liquid- and steam-phase of nitric acid-sodium nitrate solution became much more severe with the increasing sodium nitrate concentration or temperature. The steel in the steam tends to experience intergranular corrosion, thereby, partial grains on the steel surface were falled off. The increase of temperature can enhance the effect of sodium nitrate on the corrosion of 304L stainless steel.

Key words: austenitic stainless steel nitric acid nitrate intergranular corrosion

Received: 20 November 2017

ZTFLH:

TG172.6

Fund: Supported by SINOPEC Scientific Research Project(315108)

Corresponding Authors: Xin'an CUI E-mail: cuixa.lpec@sinopec.com

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	Xiwu LIU
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	Rongqi CHENG

Cite this article:

Xiwu LIU,Xiaoyan ZHAO,Xin'an CUI,Lanfei XU,Xiaowei LI,Rongqi CHENG. Corrosion Behavior of 304L Stainless Steel in Nitric Acid-Sodium Nitrate Solutions. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 543-550.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.196 OR https://www.jcscp.org/EN/Y2018/V38/I6/543

Table 1 Corrosion rates of 304L steel in NaNO₃, HNO₃and HNO₃-NaNO₃solutions and steams

Fig.1 SEM images of 304L stainless steel after corrosion in the solution (a) and steam (b) of 23%NaNO₃solution at 135 ℃

Fig.2 SEM images of 304L stainless steel after corrosion in the solutions (a, c, e, g) and steams (b, d, f, h) of 2%HNO₃(a, b), 4%HNO₃(c, d), 2%HNO₃-23%NaNO₃(e, f) and 4%HNO₃-23%NaNO₃(g, h)

Fig.3 Section micrographs of 304L stainless steel after corrosion in the solution (a) and steam (b) of 4%HNO₃-23%NaNO₃at 135 ℃

Fig.4 Potentiodynamic polarization curves of 304L stain-less steel in 2%HNO₃and 2%HNO₃-23%NaNO₃solutions at 30 ℃

Table 2 Corrosion rates of 304L stainless steel in the solutions and steams of 2%HNO₃-(0, 10%, 15%, 23%) NaNO₃at 135 ℃

Fig.5 SEM images of 304L stainless steel after corrosion in the solutions (a, c) and steams (b, d) of 2% HNO₃-10%NaNO₃(a, b) and 2%HNO₃-15%NaNO₃(c, d)

Fig.6 SEM images of 304L stainless steel after corrosion in the solutions (a, c) and steams (b, d) of 4% HNO₃-10%NaNO₃(a, b) and 4%HNO₃-15% NaNO₃(c, d)

Table 3 Corrosion rates of 304L stainless steel in the solutions and steams of HNO₃-NaNO₃at different temperatures

Fig.7 SEM images of 304L stainless steel after corrosion in the solution (a, c) and steam (b, d) of 2% HNO₃-23%NaNO₃at 120 ℃ (a, b) and 135 ℃ (c, d)

Fig.8 SEM images of 304L stainless steel after corrosion in the solution (a, c) and steam (b, d) of 4%HNO₃-23%NaNO₃at 120 ℃ (a, b) and 135 ℃ (c, d)

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