Preparation of Micro Metal Oxide pH Electrode and Its Application in Corrosion and Protection

doi:10.11902/1005.4537.2022.333

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (5): 971-982 DOI: 10.11902/1005.4537.2022.333

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Preparation of Micro Metal Oxide pH Electrode and Its Application in Corrosion and Protection

GU Yuhui¹^,², DONG Liang¹(

), SONG Qinfeng¹

^1.Jiangsu Key Laboratory of Oil & Gas Storage and Transportation Technology, School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou 213164, China
^2.Sinopec Lubricants Co., Ltd. Sales Branch, Nanjing 210003, China

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Abstract

Metal oxide electrode is widely used for pH examination in food, biology and medical industries due to its characteristics of wide pH response range (pH measurement range can reach 2-12, even 0-14) and easy to be miniaturized. It can be used for in situ measurement of pH value at the vicinity of metal/electrolyte interface, thus providing important parameters for deducing the possible electrochemical reactions, explaining specific corrosion behavior and revealing the relevant corrosion mechanism. In this paper, the response performance, performance parameters and the research progress of metal oxide electrodes made of iridium, manganese, titanium, tungsten and the relevant oxides were summarized. Among which, the iridium oxide electrode was most widely used as a pH detector for its stability and high response slope (-59.5 - -74.91 mV/pH). The commonly used preparation methods for micro metal oxide pH electrodes such as electrochemical deposition method, thermal oxidation method, sol-gel method, screen printing method, etc. as well as the effect of different process parameters were also summarized. The electrochemical deposition method had a broad application prospect, and with which the prepared electrodes had the characteristics of low cost, high response slope and fast response rate, but their potential drift for the long-term service needed to be solved. Aiming at the matter of potential drift and long aging time of metal pH electrodes, the effect of post-treatment processes such as hydration, heat treatment and hydrothermal treatment on the electrode performance were introduced. The applications of metal oxide pH micro-electrodes for the examination of pitting corrosion, galvanic corrosion, stress corrosion and other local corrosion, as well as for the monitoring cathodic protection were reviewed, including the micro metal oxide pH electrode, composite double-tube pH electrode and the combination of pH electrode and scanning electrochemical microscopy technology (SECM), etc. The metal oxide electrode was easy to be miniaturized and had a stable response, which made it show good response performance in the process of monitoring the change of pH value nearby the metal/electrolyte interface formed during local anodic corrosion or cathodic reduction reaction. Lastly, the preparation technology and application trend of the micro metal oxide electrode were also prospected.

Key words: micro pH electrode metal/metal oxide pH electrode preparation technology corrosion and protection local corrosion cathodic protection

Received: 28 October 2022 32134.14.1005.4537.2022.333

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51401017);Jiangsu Province Graduate Research and Practice Innovation Program(SJCX21_1269)

Corresponding Authors: DONG Liang, E-mail: dongliang@cczu.edu.cn

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Cite this article:

GU Yuhui, DONG Liang, SONG Qinfeng. Preparation of Micro Metal Oxide pH Electrode and Its Application in Corrosion and Protection. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 971-982.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.333 OR https://www.jcscp.org/EN/Y2023/V43/I5/971

Fig.1 Surface morphologies of IrOx electrode heated at 700 ℃ (a1-d1), 750 ℃ (a2-d2), 800 ℃ (a3-d3), and 870 ℃ (a4-d4) for 0.5 h (a1-a4), 1.0 h (b1-b4), 1.5 h (c1-c4) and 2 h (d1-d4)^[48]

Fig.2 Surface morphologies of IrO _x electrode without (a) and with (b) hydration treatment^[37]

Fig.3 XPS fine peaks of Ir 4f of IrO _x electrode without (a) and with (b) supercritical treatment^[51]

Table 1 Summary of preparation method and performance of electrodes

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