CORROSION BEHAVIOR OF PURE Mg BASED ON GENERATION/COLLECTION AND FEEDBACK MODES OF SCANNING ELECTROCHEMICAL MICROSCOPY

doi:10.11900/0412.1961.2014.00602

Acta Metall Sin

2015, Vol. 51

Issue (5): 631-640 DOI: 10.11900/0412.1961.2014.00602

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CORROSION BEHAVIOR OF PURE Mg BASED ON GENERATION/COLLECTION AND FEEDBACK MODES OF SCANNING ELECTROCHEMICAL MICROSCOPY

Xinyin WANG,Yan XIA,Yaru ZHOU,Linlin NIE,Fahe CAO(

),Jianqing ZHANG,Chunan CAO

Department of Chemistry, Zhejiang University, Hangzhou 310027

Cite this article:

Xinyin WANG, Yan XIA, Yaru ZHOU, Linlin NIE, Fahe CAO, Jianqing ZHANG, Chunan CAO. CORROSION BEHAVIOR OF PURE Mg BASED ON GENERATION/COLLECTION AND FEEDBACK MODES OF SCANNING ELECTROCHEMICAL MICROSCOPY. Acta Metall Sin, 2015, 51(5): 631-640.

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Abstract

Since electrochemical impedance spectroscopy, polarization curve and hydrogen collection were the main technologies for corrosion research of Mg and its alloy. However, those methods only provide the mean information of entire surface of corrosion electrode. In this work, H₂ evolution and active sites of pure Mg from localized sites (point, line and surface) in NaCl and Na₂SO₄ solution based on generation/collection and feedback modes of scanning electrochemical microscopy (SECM) were studied. The results indicate that both cathodic and anodic polarization are in favor of H₂ evolution in NaCl and Na₂SO₄ solution, which is well in line with the negative difference effect by the classical H₂ collection, but the SECM results show that the H₂ evolution in localized sites is not uniform and stable. The H₂ evolution rate increases with NaCl concentration increasing, which is opposite in Na₂SO₄solution. The higher NaCl concentration, anodic polarization and lower pH value accelerate the formation of active sites on pure Mg surface.

Key words: SECM pure Mg hydrogen evolution active site

Received: 31 October 2014

Fund: National Natural Science Foundation of China (Nos.51171172 and 51131005) and Fundamental Research Funds for the Central Universities (No.2015QNA3011)

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	Xinyin WANG
	Yan XIA
	Yaru ZHOU
	Linlin NIE
	Fahe CAO
	Jianqing ZHANG
	Chunan CAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00602 OR https://www.ams.org.cn/EN/Y2015/V51/I5/631

Fig.1 Typical curve of tip current (I_tip) for hydrogen oxidation with time (t)

Fig.2 Schematics of substrate generation/tip collection mode (a) and feedback mode (b) of scanning electrochemical microscopy (SECM)

Fig.3 Tip current for hydrogen oxidation (I_tip) of pure Mg under different over potentials (h) in 0.1 mol/L NaCl (a) and 0.1 mol/L Na₂SO₄ (b) solution

Fig.4 Line scan results (a) and surface mapping results (b~f) of pure Mg with different polarization potentials in 0.1 mol/L Na₂SO₄solution

(a) line scan results at open circuit potential, -0.2 V and 0.1 V polarization

(b) open circuit (c) -0.2 V (d) -0.1 V (e) 0.1 V (f) 0.3 V

Fig.5 Tip current for hydrogen oxidation (I_tip) of pure Mg in NaCl and Na₂SO₄ solutions with different concentrations

Fig.6 Line scan results of pure Mg at open circuit potential in NaCl (a) and Na₂SO₄ (b) solutions with different concentrations

Fig.7 Surface mappings of pure Mg in 0.1 mol/L (a~c) and 0.5 mol/L (d~f) NaCl solution with 3 h (a, d), 12 h (b, e) and 24 h (c, f)

Fig.8 Surface mappings of pure Mg in 0.1 mol/L NaCl solution at 0.1 V (a~c) and -0.2 V (d~f) polarization with 3 h (a, d), 12 h (b, e) and 24 h (c, f)

Fig.9 Surface mappings of pure Mg in 0.1 mol/L NaCl solution at pH=2 (a~c) and pH=11 (d~f) with 3 h (a, d), 12 h (b, e) and 24 h (c, f)

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