Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Specimen Preparation
2.2. Test Methods
3. Results and Discussion
3.1. Phase Structure of Fe-Based Amorphous/Nanocrystalline Coating (AC)
3.2. Corrosion Resistance of Fe-Based Amorphous/Nanocrystalline Coating (AC) vs. Conventional Materials
3.3. The Effects of pH Values on Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating
3.4. Composition Analysis of Passive Film Formed on Fe-Based Amorphous/Nanocrystalline Coating
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Parameters | Optimized Value |
---|---|
Oxygen (O2) (L/min) | 900 |
Kerosene (Ke) (L/h) | 22 |
O2/Ke burning ratio(λ) | 1.18 |
Combustion pressure (Bar) | 8.5 |
Nozzle | 150/11 |
Carrier gas (N2) (L/min) | 9 |
Powder feed rate (g/min) | 100 |
Spray distance (mm) | 380 |
Transverse speed (mm/s) | 1000 |
Deposition efficiency (%) | 30 –45 |
Samples | Epit (mVSCE) | Ecorr (mVSCE) | Epit − Ecorr (mV) | Ip (A/cm2) |
---|---|---|---|---|
304 stainless steel | 388 ± 11 | –277 ± 11 | 665 ± 20 | (0.73–1.3) × 10−6 |
Cr plating | 918 ± 20 | –543 ± 12 | 1461 ± 34 | (0.20–1.5) × 10−4 |
Fe-based AC | 929 ± 18 | –294 ± 17 | 1223 ± 34 | (0.22–1.1) × 10−5 |
Samples | Rsol (cm2) | Rpore (cm2) | Rp (cm2) | CPEfilm | CPEdl | ||
---|---|---|---|---|---|---|---|
Y0 (cm−2·s−n) | n | Y0 (cm−2·s−n) | n | ||||
pH = 7, 24 h | 14.91 | 1561 | 1.7 × 105 | 2.77 × 10−5 | 0.89 | 3.39 × 10−4 | 0.44 |
pH = 7, 216 h | 14.96 | 1060 | 3.7 × 1011 | 1.84 × 10−5 | 0.91 | 2.24 × 10−4 | 0.38 |
pH = 7, 504 h | 15.31 | 831.4 | 1.7 × 106 | 1.82 × 10−5 | 0.90 | 2.36 × 10−4 | 0.35 |
pH = 1, 24 h | 14.55 | 10530 | 4.6 × 104 | 7.8 × 10−4 | 0.62 | 13.7 × 10−4 | 1 |
pH = 1, 216 h | 11.45 | 18 | 1.5 × 104 | 10.3 × 10−4 | 0.59 | 3.5 × 10−4 | 0.96 |
pH = 1, 504 h | 12.17 | 9 | 6.6 × 103 | 9.4 × 10−4 | 0.68 | 21.6 × 10−4 | 0.87 |
Samples | Rsol (cm2) | Rpore (cm2) | Rp (cm2) | Rdiff (cm2) | CPEfilm | CPEdl | Zw−Y0 (cm2·s−1/2) | ||
---|---|---|---|---|---|---|---|---|---|
Y0 (cm−2·s−n) | n | Y0 (cm−2·s−n) | n | ||||||
pH = 13, 24 h | 12.44 | 6 | 8.7 × 1014 | 1118 | 6.50 × 10−6 | 0.99 | 2.61 × 10−4 | 0.52 | 1.4 × 10−4 |
pH = 13, 216 h | 12.73 | 20380 | 1.4 × 1013 | 205.8 | 1.89 × 10−5 | 0.88 | 8.10 × 10−4 | 1.00 | 2.7 × 10−4 |
pH = 13, 504 h | 13.89 | 14560 | 8.3 × 1013 | 242.5 | 2.00 × 10−5 | 0.88 | 9.24 × 10−4 | 1.00 | 2.9 × 10−4 |
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Zhang, J.; Deng, C.; Song, J.; Deng, C.; Liu, M.; Dai, M. Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed. Coatings 2019, 9, 226. https://doi.org/10.3390/coatings9040226
Zhang J, Deng C, Song J, Deng C, Liu M, Dai M. Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed. Coatings. 2019; 9(4):226. https://doi.org/10.3390/coatings9040226
Chicago/Turabian StyleZhang, Jifu, Chunming Deng, Jinbing Song, Changguang Deng, Min Liu, and Mingjiang Dai. 2019. "Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed" Coatings 9, no. 4: 226. https://doi.org/10.3390/coatings9040226