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| Evaluation of Protective Properties of Organic Coatings Using Cycle-based Wavelet Energy Spectroscopy |
| Received:October 19, 2018 Revised:December 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.12.020 |
| KeyWord:discrete wavelet transform military green organic coating corrosion EDP |
| Author | Institution |
| XU An-tao |
a. Delivery Equipment Support Department, Army Military Transpor-tation University, Tianjin , China |
| ZHOU Hui |
b. Postgraduate Training Brigade, Fifth Team of Cadets, Army Military Transpor-tation University, Tianjin , China |
| LI Xi-dong |
b. Postgraduate Training Brigade, Fifth Team of Cadets, Army Military Transpor-tation University, Tianjin , China |
| WEI Jun-yi |
b. Postgraduate Training Brigade, Fifth Team of Cadets, Army Military Transpor-tation University, Tianjin , China |
| QIAO Yuan-bo |
b. Postgraduate Training Brigade, Fifth Team of Cadets, Army Military Transpor-tation University, Tianjin , China |
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| Abstract: |
| Objective To verify the effectiveness of discrete wavelet decomposition in the evaluation of organic coating pro-tection performance in military vehicles. Methods The electrochemical noise data of the military green organic coating after each test cycle was measured by designing a multi-factor integrated cyclic accelerated corrosion test. The improved wavelet energy distribution (EDP) calculation method was applied; and the performance of the coating was evaluated by combining the d1—d8 wavelet detail coefficients. Results The d1 unit cell standard deviation increased from 2×10?11 A/cm2 in the initial state to 7.98×10?11 A/cm2 in the sixth cycle, and finally dropped to 2.51×10?11 A/cm2. The results of EDP analysis showed that the first 3 cycles were the pre-corrosion period of the military green organic coating. The relative energy was mainly distributed in the d7, d8 unit cell. The coating could provide effective protection for the base metal. The cycles 4—7 were the middle of corrosion. The amplitude and frequency of the noise current fluctuated greatly. The relative energy distribution shifted to d1, d2 unit cell. Cycles 8 and 9 were late corrosion. And the relative energy was dispersed between d1-d4. Conclusion The cycle-based wavelet energy spectrum method can clearly describe the changes in the corrosion process of the military green organic coating, and is an effective coating performance evaluation method. |
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