Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (9): 1111-1121.DOI: 10.1007/s40195-019-00900-8
Special Issue: 2019年镁合金专辑; 2019年腐蚀专辑-2
• Orginal Article • Previous Articles Next Articles
Yu-Fen Zhang1,2, Sha-Wei Tang1(), Tie-Gui Lin2, Guang-Yi Liu1,4, Jin Hu3()
Received:
2019-01-11
Revised:
2019-02-24
Online:
2019-09-10
Published:
2019-08-06
Yu-Fen Zhang, Sha-Wei Tang, Tie-Gui Lin, Guang-Yi Liu, Jin Hu. Corrosion Properties of Calcium Stearate-Based Hydrophobic Coatings on Anodized Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(9): 1111-1121.
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Al | Cu | Mn | Fe | Ni |
---|---|---|---|---|
1.92000 | 0.01330 | 0.37700 | 0.01200 | 0.00108 |
Zn | Be | Si | Ag | Ca |
1.18000 | 0.00004 | 0.05190 | <?0.00010 | 0.00444 |
Sn | Zr | Ce | La | Mg |
<?0.00050 | <?0.00060 | 0.00535 | 0.01410 | 96.42000 |
Table 1 Chemical composition of the received material (wt%)
Al | Cu | Mn | Fe | Ni |
---|---|---|---|---|
1.92000 | 0.01330 | 0.37700 | 0.01200 | 0.00108 |
Zn | Be | Si | Ag | Ca |
1.18000 | 0.00004 | 0.05190 | <?0.00010 | 0.00444 |
Sn | Zr | Ce | La | Mg |
<?0.00050 | <?0.00060 | 0.00535 | 0.01410 | 96.42000 |
Fig. 2 Current density as a function of time recorded during the electrodeposition process. The insets are the SEM images of the coatings formed under 50 V at 1 min a, 7 min b
Fig. 3 Surface morphologies of the anodized magnesium alloy a and coatings formed at the different voltages (b 20 V, c 50 V, d 100 V). The insets in b, c, d show images at high magnification, respectively
Fig. 4 3D observations and 2D roughness parameters of the coatings obtained at the different working voltages: a 20 V, b 50 V, c 100 V. The insets are static contact angle of water droplet on the surface of the coatings, respectively
Samples | Epit (V vs. SCE) |
---|---|
Anodized Mg alloy | -?1.62?±?0.02 |
HC-20 | -?0.95?±?0.03 |
HC-50 | -?0.47?±?0.06 |
HC-100 | -?0.95?±?0.01 |
Table 2 Pitting potential of the samples as read from Fig. 6
Samples | Epit (V vs. SCE) |
---|---|
Anodized Mg alloy | -?1.62?±?0.02 |
HC-20 | -?0.95?±?0.03 |
HC-50 | -?0.47?±?0.06 |
HC-100 | -?0.95?±?0.01 |
Fig. 7 Bode plot evolution of the coated substrates (a HC-20, b HC-50, c HC-100) and the anodized magnesium alloy d in SBF at 37?±? 0.5 °C. Symbols are experimental data and solid lines are fitting data
Fig. 8 Equivalent circuit models for the impedance spectra of the coated samples and anodized magnesium alloy substrate immersion in SBF at 37?±?0.5 °C during the different periods: a 0 h, 6 h, and 12 h for HC-50; b 0-24 h for HC-20, 24-96 h for HC-50, and 0-96 h for HC-100; c 48-96 h for HC-20 and 0-12 h for the anodized magnesium alloy
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