Corrosion Behavior of Austenitic Stainless Steel S31655 in a Simulated Wet Process Phosphoric Acid Solution

doi:10.11901/1005.3093.2023.590

Chinese Journal of Materials Research

2024, Vol. 38

Issue (12): 902-910 DOI: 10.11901/1005.3093.2023.590

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Corrosion Behavior of Austenitic Stainless Steel S31655 in a Simulated Wet Process Phosphoric Acid Solution

ZHANG Jianbin¹^,²(

), TIAN Huan¹^,², OUYANG Minghui³, HAO Ting⁴

1 State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2 Wenzhou Pump and Valve Research Institute of Lanzhou University of Technology, Wenzhou 325000, China
3 Zhejiang Xuanda Group Corrosion Resistant Special Metal Materials Research Institute, Wenzhou 325000, China
4 School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou 215009, China

Cite this article:

ZHANG Jianbin, TIAN Huan, OUYANG Minghui, HAO Ting. Corrosion Behavior of Austenitic Stainless Steel S31655 in a Simulated Wet Process Phosphoric Acid Solution. Chinese Journal of Materials Research, 2024, 38(12): 902-910.

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Abstract

The corrosion behavior of austenitic stainless steel S31655 in a simulated industrial wet process phosphoric acid solution at 25^oC, 40^oC, 60^oC and 80^oC was investigated by means of electrochemical test and XPS technique. The results show that: with the increasing temperature, the corrosion resistance of S31655 decreases and the is a critical point at 60^oC, while the corrosion resistance decreased significantly at 80^oC, meanwhile, the defects concentration N_D of the formed passivation film increased, its thickness W_sc decreased, and thestability deteriorated, meanwhile, the semi-conductivity of the passivation film transforms from n-type semiconductor to p-type semiconductor by potential above 0.7 V. Results of XPS spectra show that Cr₂O₃and Fe(Ⅲ) etc. could improve the corrosion resistance by stabilizing the passivation film, and ligands $\mathrm{NH}_{4}^{+}$ and NH₃ could inhibit the corrosion process by acting as retardant to acidic solutions. The presence of a critical temperature is associated with an increase in the solubility of N and $\mathrm{NH}_{4}^{+}$ in the passivation film at 80^oC. The increase in temperature simultaneously promotes the generation of soluble Fe(H₂PO₄)₂ and porous films, and the significant enrichment of Ni and N in S31655 leads to a decrease in the precipitation rate of Cr₂O₃, but also promotes the full crystallization and structural stability of Cr₂O₃, thereby improving its corrosion resistance.

Key words: material corrosion and protection wet process phosphoric acid corrosion electrochemistry passivation film nitrogen containing austenitic stainless steel

Received: 14 December 2023

ZTFLH:

TG142.71

Fund: National Natural Science Foundation of China(12075274)

Corresponding Authors: ZHANG Jianbin, Tel: 13519630320, E-mail: jbzhangjb@hotmail.com

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.590 OR https://www.cjmr.org/EN/Y2024/V38/I12/902

Fig.1 Microstructure characterization of S31655 (a) optical image; (b) XRD pattern results

Fig.2 Polarization behavior of S31655 in wet process phosphoric acid (a) S31655 and S31603 at 25^oC; (b) S31655 at various temperatures

Table 1 Polarization parameters of S31655 in wet process phosphoric acid at different temperatures

Fig.3 I-t curves of S31655 in wet process phosphoric acid at different temperatures (a) current density-time transients; (b) lgI-lgt plots

Fig.4 Corrosion morphology of S31655 after constant potential polarization in wet process phosphoric acid (a) 25^oC; (b) 80^oC

Table 2 Constant potential polarization parameters of S31655 in wet process phosphoric acid at different temperatures

Fig.5 Electrochemical impedance spectroscopy of S31655 in wet process phosphoric acid at different temperatures (a) Nyquist piots; (b) Bode plots

Table 3 EIS fitting parameters of S31655 in wet process phosphoric acid at different temperatures

Table 4 The donor density of S31655 in wet process phosphoric acid at different temperatures

Fig.6 Mott Schottky curves of S31655 in wet process phosphoric acid at different temperatures (a) capacitance-potential; (b) space charge layer thickness-potential

Fig.7 XPS spectrogram of S31655 passivation film in wet process phosphoric acid (a) O1s; (b) Cr2p; (c) Fe2p; (d) Ni2p; (e) N1s; (f) P2p

Fig.8 Composition of passivation film of S31655 in wet process phosphoric acid at different temperatures (a) elemental composition; (b) species composition

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