Corrosion Resistance of Superhydrophobic Mg(OH)2/Calcium Myristate Composite Coating on Magnesium Alloy AZ31

doi:10.1007/s40195-021-01262-w

Abstract

Abstract:

Hydrophobic Mg(OH)₂/calcium myristate (Ca[CH₃(CH₂)₁₂COO]₂, CaMS) and Mg(OH)₂/magnesium myristate (Mg[CH₃(CH₂)₁₂COO]₂, MgMS) composite coatings were prepared on the alkali-treated AZ31 substrates via both electrodeposition and dipping methods. The morphologies, compositions, and constitutes of the coatings were investigated by using field-emission scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrometry (FTIR) together with X-ray diffractometer (XRD). Furthermore, electrochemical (polarization and impedance spectroscopy) and hydrogen evolution tests were applied to evaluate the corrosion resistance. The wettability and adhesive strength of the composite coatings were characterized through water static contact angle (CA), sliding angle (SA), and nano-scratch tests. Results indicated that the better super-hydrophobicity, corrosion resistance, and adhesion were achieved via an electrodeposited process. The corrosion current density (i_corr) and hydrogen evolution rate (HER) of the electrodeposited coating were three and one orders of magnitude smaller than the substrate, implying a significantly improved corrosion resistance. This scenario was ascribed to the super-hydrophobicity of electrodeposited composite coating with a contact angle (CA) and slide angle (SA) of 159.2° ± 0.8° and 5.2° ± 0.8°, respectively. However, the dipped composite coating was adverse to the improvement of corrosion resistance and adhesion due to the dissolution of the underlying Mg(OH)₂ layer and smooth surface with less organic fatty acid salt (MgMS)

Key words: Magnesium alloy, Electrodeposition and dipping, Super-hydrophobicity, Corrosion resistance

Zheng-Zheng Yin, Wei Zhao, Jing Xu, Rong-Chang Zeng, Feng-Qin Wang, Zhen-Lin Wang. Corrosion Resistance of Superhydrophobic Mg(OH)₂/Calcium Myristate Composite Coating on Magnesium Alloy AZ31[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(12): 1618-1634.

Figures/Tables 19

References 57

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Liquids	\({\gamma }_{\mathrm{L}}\)	\({\gamma }_{\mathrm{L}}^{+}\)	\({\gamma }_{\mathrm{L}}^{-}\)	\({\gamma }_{\mathrm{L}}^{\mathrm{LW}}\)
Diiodomethane	50.8	0	0	50.8
Glycol	48.0	1.92	47.0	29.0
Water	72.8	25.5	25.5	21.8

Liquids	\({\gamma }_{\mathrm{L}}\)	\({\gamma }_{\mathrm{L}}^{+}\)	\({\gamma }_{\mathrm{L}}^{-}\)	\({\gamma }_{\mathrm{L}}^{\mathrm{LW}}\)
Diiodomethane	50.8	0	0	50.8
Glycol	48.0	1.92	47.0	29.0
Water	72.8	25.5	25.5	21.8

Sample	\({\gamma }_{\mathrm{S}}^{-}\)	\({\gamma }_{\mathrm{S}}^{+}\)	\({\gamma }_{\mathrm{S}}^{\mathrm{AB}}\)	\({\gamma }_{\mathrm{S}}^{\mathrm{LW}}\)	\({\gamma }_{\mathrm{s}}\)
Coating II	0.08	0.01	0.06	16.73	16.79
Coating III	0.97	0.72	1.67	6.21	7.88

Sample	\({\gamma }_{\mathrm{S}}^{-}\)	\({\gamma }_{\mathrm{S}}^{+}\)	\({\gamma }_{\mathrm{S}}^{\mathrm{AB}}\)	\({\gamma }_{\mathrm{S}}^{\mathrm{LW}}\)	\({\gamma }_{\mathrm{s}}\)
Coating II	0.08	0.01	0.06	16.73	16.79
Coating III	0.97	0.72	1.67	6.21	7.88

Samples	βa (mV·dec^-1)	- βc (mV·dec^-1)	E_corr (V/SCE)	i_corr (A·cm^-2)	R_p (Ω·cm²)	η (%)
AZ31	83.81	122.89	- 1.53	3.36 × 10^-5	6.44 × 10²	-
Coating I	127.00	77.40	- 1.45	3.23 × 10^-7	6.46 × 10⁴	99.04
Coating II	133.52	102.13	- 1.47	4.62 × 10^-7	5.44 × 10⁴	98.63
Coating III	8.96	115.19	- 1.43	1.86 × 10^-8	1.94 × 10⁵	99.95

Corrosion Resistance of Superhydrophobic Mg(OH)₂/Calcium Myristate Composite Coating on Magnesium Alloy AZ31

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Figures/Tables 19

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Sample	R_s (Ω·cm²)	CPE_f (Ω^-1·sⁿ·cm^-2)	n	R_f (Ω·cm²)	CPE₁ (Ω^-1·sⁿ·cm^-2)	n	R_ct (Ω·cm²)	R_L (Ω·cm²)	L (H·cm²)
AZ31	25.84	-	-	-	9.83 × 10^-6	0.96	2.59 × 10²	2.87 × 10²	9.97 × 10²
Coating I	34.58	7.37 × 10^-7	0.87	1.29 × 10⁴	5.47 × 10^-5	0.30	7.78 × 10⁴	2.31 × 10⁴	1.98 × 10⁵
Coating II	31.57	1.16 × 10^-6	0.89	9.91 × 10³	9.95 × 10^-5	0.28	1.15 × 10⁴	1.35 × 10⁴	1.92 × 10⁵
Coating III	4.56 × 10³	1.08 × 10^-9	0.88	2.16 × 10⁴	6.44 × 10^-7	0.54	5.48 × 10⁶	2.85 × 10⁵	5.63 × 10²

Method	Substrate	Middle layer	Superhydrophobic coating	References
MAO + Electrodeposition	3.55 × 10^-5	8.36 × 10^-6	7.68 × 10^-8	[33]
MAO + Soak/Heated	4.21 × 10^-4	1.13 × 10^-6	2.35 × 10^-7	[52]
Layered double hydroxide (LDH) + Soak	7.54 × 10^-6	1.67 × 10^-7	7.70 × 10^-8	[53]
LDH + Electrodeposition	9 × 10^-5	4 × 10^-5	4 × 10^-6	[54]
Soak + Hydrothermal	4.25 × 10^-6	5.96 × 10^-7	4.13 × 10^-8	[55]
Soak + Soak	9.25 × 10^-5	-	2.17 × 10^-7	[56]
Plasma Sputter + Chemical Vapor Deposition	6.92 × 10^-4	-	1.50 10^-5	[57]

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