Corrosion Inhibition Performance of Nitrobarbituric Acid on Mg-alloys AZ31B and AZ91D in 3.5%NaCl Solution

doi:10.11902/1005.4537.2024.301

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 916-926 DOI: 10.11902/1005.4537.2024.301

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Corrosion Inhibition Performance of Nitrobarbituric Acid on Mg-alloys AZ31B and AZ91D in 3.5%NaCl Solution

ZHAI Yaru¹, XIONG Jinping¹, ZHAO Jingmao¹^,²(

)

1 College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2 Beijing Key Laboratory of Materials Electrochemical Process and Technology, Beijing 100029, China

Cite this article:

ZHAI Yaru, XIONG Jinping, ZHAO Jingmao. Corrosion Inhibition Performance of Nitrobarbituric Acid on Mg-alloys AZ31B and AZ91D in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 916-926.

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Abstract

The inhibition performance of nitrobarbituric acid (NBA) on AZ31B and AZ91D alloys in 3.5%NaCl solution was comparatively evaluated using weight loss method, hydrogen evolution measurement, and electrochemical tests. The results revealed that NBA significantly could inhibit the corrosion of AZ31B in 3.5%NaCl solution, whereas it promoted the corrosionof AZ91D alloy. The inhibition mechanisms of NBA on the two Mg-alloys were elucidated through SEM-EDS, XRD, and XPS analyses. The acidic NBA reduced the pH value of 3.5%NaCl solution, initially dissolving Mg matrix of AZ31B alloy. For AZ31B alloy, the dissolution of the Mg matrix released Mg²⁺ ions, facilitating the formation of a dense Mg(OH)₂ scale on the alloy surface, which effectively inhibited the further corrosion. Conversely, the inherent corrosion resistance of AZ91D hindered the rapid formation of a protective scale Mg(OH)₂, allowing NBA to dissolve the substrate, thus promoting the corrosion of AZ91D alloy.

Key words: nitrobarbituric acid AZ31B AZ91D magnesium alloy corrosion inhibitors corrosion inhibition mechanism

Received: 17 September 2024 32134.14.1005.4537.2024.301

ZTFLH:

TG174.42

Fund: National Natural Science Foundation of China(52371046)

Corresponding Authors: ZHAO Jingmao, E-mail: jingmaozhao@126.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.301 OR https://www.jcscp.org/EN/Y2025/V45/I4/916

Table 1 Corrosion rate and inhibition efficiency of AZ31B soaked in 3.5%NaCl solution with or without adding 1 g/L NBA at three temperatures

Table 2 Corrosion rate and inhibition efficiency of AZ91D soaked in 3.5%NaCl solution with or without adding 1 g/L NBA at three temperatures

Table 3 Hydrogen evolution results of AZ31B and AZ91D soaked in 3.5%NaCl solution with and without 1 g/L NBA

Fig.1 Potentiodynamic polarization curves of AZ31B and AZ91D Mg-alloys soaked for 24 h in 3.5%NaCl solution with/without 1 g/L NBA: (a) AZ31B, (b) AZ91D

Table 4 Electrochemical parameters of potentiodynamic polarization curves of two Mg-alloys obtained by fitting using CView software

Fig.2 AZ31B Mg-alloy soaked in 3.5%NaCl solution with/without 1 g/L NBA for 24 h: (a) Nyquist plot, (b) Bode plot, and equivalent circuit of (c) blank, (d) 1 g/L NBA

Fig.3 AZ91D Mg-alloy soaked in 3.5%NaCl solution with/without 1 g/L NBA for 24 h: (a) Nyquist plot, (b) Bode plot, (c) equivalent circuit

Table 5 Fitting parameters of AZ31B in 3.5%NaCl solution with or without 1 g/L NBA at 25 ℃

Table 6 Fitting parameters of AZ91D in 3.5%NaCl solution with or without 1 g/L NBA at 25 ℃

Fig.4 XRD of surface corrosion products of AZ31B and AZ91D Mg-alloys soaked in 3.5%NaCl solution containing 1 g/L NBA at 25, 35 and 50 ℃ for 72 h, respectively. AZ31B: (a) 25 ℃, (b) 35 ℃, (c) 50 ℃; AZ91D: (d) 25 ℃, (e) 35 ℃, (f) 50 ℃

Fig.5 SEM images of AZ31B Mg-alloy soaked in 3.5%NaCl solution containing 1 g/L NBA for 24, 48 and 72 h, respectively: (a) 24 h, (b) 48 h and (c) 72 h at 25 ℃, (d) 24 h, (e) 48 h and (f) 72 h at 35 ℃, (g) 24 h, (h) 48 h and (i) 72 h at 50 ℃

Fig.6 EDS patterns of AZ31B Mg-alloy soaked in 3.5%NaCl solution containing 1 g/L NBA for 72 h: (a) 25 ℃, (b) 35 ℃, (c) 50 ℃

Fig.7 SEM images of AZ91D Mg-alloy soaked in 3.5%NaCl solution containing 1 g/L NBA for 24, 48 and 72 h, respectively: (a) 24 h, (b) 48 h and (c) 72 h at 25 ℃; (d) 24 h, (e) 48 h and (f) 72 h at 35 ℃; (g) 24 h, (h) 48 h and (i) 72 h at 50 ℃

Fig.8 EDS of AZ31B Mg-alloy soaked in 3.5%NaCl solution containing 1 g/L NBA for 72 h: (a) 25 ℃, (b) 35 ℃, (c) 50 ℃

Fig.9 SEM image of cross-sections of AZ31B Mg-alloy soaked in 3.5%NaCl solution containing 1 g/L NBA at 25 ℃ for 72 h

Fig.10 Wide-scan spectra of AZ31B (a) and AZ91D (b) Mg-alloys soaked in 3.5%NaCl solution with 1 g/L NBA at 50 ℃ for 72 h

Fig.11 High resolution spectra of AZ31B Mg-alloy soaked in 3.5%NaCl solution with 1 g/L NBA at 50 ℃ for 72 h: (a) C 1s, (b) Mg 1s, (c) O 1s, (d) N 1s

Table 7 pH values of 3.5%NaCl solution containing 1 g/L NBA for different immersion time at 35 ℃ for AZ31B and AZ91D

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