Hydrophobic Modification of Magnesium Hydroxide Coating Deposited Cathodically on Magnesium Alloy and its Corrosion Protection
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Effects of Modifying Parameters
3.1.1. Concentration of stearic acid
3.1.2. Solution Temperature
3.1.3. Treatment Time
3.2. Corrosion Protection
3.2.1. Droplet Test
3.2.2. Total Immersion Corrosion Test
3.2.3. Electrochemical Measurements
3.3. Surface Wettability
3.4. Coating Adhesion
3.5. Micromorphology
3.6. Chemical Composition
4. Conclusions
- Superhydrophobic surface with admirable 151.5° water static contact angle and 1° rolling angle could be obtained on Mg alloy substrate by CD + HT composite treatment in which Mg(OH)2 film was prepared by cathodic deposition firstly and then a simple immersion was done in a low-concentration ethanol solution of stearic acid for a short period. The optimal surface modifying parameters were 5 g/L of stearic acid at 80 °C for 1 h of immersion.
- Only CD/HT composite modification could realize surface superhydrophobization of Mg alloy, whereas single cathodic deposition or single hydrophobic treatment could not.
- SEM observation showed that Mg(OH)2 coating modified by stearic acid consisted of blade-like structures with micro/nano scale sizes. This kind of micro/nano structures were interlaced to form a large number of voids, which effectively inhibited surface contact with water and fluids and significantly improved the corrosion resistance of Mg alloy.
- The FT-IR spectrum test results showed that new –CH2– peaks appeared in the infrared spectrum of the CD + HT sample, indicating that stearic acid had reacted with the Mg(OH)2 film in a self-assembled or chemically bonded manner.
Author Contributions
Funding
Conflicts of Interest
References
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Percent Area Removed | 0% | Less Than 5% | 5%–15% | 15%–35% | 35%–65% | Greater Than 65% |
---|---|---|---|---|---|---|
Classification | 5B | 4B | 3B | 2B | 1B | 0B |
Sample | Blank | CD | Blank + HT | CD + HT |
---|---|---|---|---|
Discoloration time, s | 40 | 550 | 134 | 1037 |
Sample | Ecorr (V) | icorr (μA/cm2) |
---|---|---|
Blank | −1.5675 | 5.3660 |
CD | −1.5748 | 2.5588 |
Blank + HT | −1.6049 | 2.4051 |
CD + HT | −1.6240 | 6.2955 × 10−3 |
Sample | Blank | CD | Blank + HT | CD + HT |
---|---|---|---|---|
|Z|0.1 Hz | 4.66 × 102 | 4.14 × 103 | 3.18 × 103 | 1.45 × 106 |
Sample | Ratio of Film Spalling | Adhesion Level | Image of Film Spalling |
---|---|---|---|
CD | 0% | 5B | |
CD + HT | 0% | 5B |
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Zhang, Y.; Cao, H.; Huang, H.; Wang, Z. Hydrophobic Modification of Magnesium Hydroxide Coating Deposited Cathodically on Magnesium Alloy and its Corrosion Protection. Coatings 2019, 9, 477. https://doi.org/10.3390/coatings9080477
Zhang Y, Cao H, Huang H, Wang Z. Hydrophobic Modification of Magnesium Hydroxide Coating Deposited Cathodically on Magnesium Alloy and its Corrosion Protection. Coatings. 2019; 9(8):477. https://doi.org/10.3390/coatings9080477
Chicago/Turabian StyleZhang, Yongjun, Hui Cao, Hanxiong Huang, and Zhiping Wang. 2019. "Hydrophobic Modification of Magnesium Hydroxide Coating Deposited Cathodically on Magnesium Alloy and its Corrosion Protection" Coatings 9, no. 8: 477. https://doi.org/10.3390/coatings9080477