博士 / 國立中興大學 / 環境工程學系所 / 106 / Taiwan is an island and its tropical marine climate exhibits highly humid, saline and high-temperature characteristics. Such climate characteristics, when combined with air pollutants, will result in a high-corrosion environment for metallic materials. Therefore, it is necessary to investigate the specific corrosion characteristics of metals under the atmospheric environment in Taiwan. The results may help the engineering personnel to enhance the corrosion-protection design and maintenance, and improve the safety of public structures.
To understand the metal corrosion characteristics in atmospheric environment in Taiwan, this study conducted a series of metallic exposure tests of carbon steel, zinc, copper, and aluminum based on ISO 9223 at Taichung Harbor. The corrosion situation, levels, and trends of the four metals are analyzed to investigate the atmospheric corrosion deterioration factors. The results data of metallic exposure tests are used to develop ANN (artificial nueral network), MLR-ANN (multiple linear regression-ANN), and PCA-ANN (principal component analysis-ANN) models to predict metallic corrosion rates.
The results indicate that according to the classification of ISO 9223 atmospheric corrosion of one-year-period deterioration factor (time of wetness, chloride and sulfur dioxide), the four metals are all raked as C4. However, for one-year-period exposure test, carbon steel, copper and aluminum can reach C5 rank. During the two-year metallic corrosion period, the four metals all exhibited higher corrosion rates in the initial stages. The corrosion rates of aluminum and zinc become stable in the second month, and carbon steel and copper become stable in the sixth month. For the prediction performance, all of the three models show good performance at corrocion predictions of carbon steel and copper, and ANN and PCA-ANN models are suitable for zinc, and aluminum, respectively.
| Identifer | oai:union.ndltd.org:TW/106NCHU5087059 |
| Date | January 2018 |
| Creators | Chien-Ming Lo, 羅建明 |
| Contributors | Min-Der Lin, 林明德 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 140 |
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