Title Investigation of Corrosive Environments for Metal Materials in Taiwan Region in 2023 and Correlation Analysis of Carbon Steel Alloy and Corrosion Factors.
Dept Transportation Technology Research Center
Year 2024
Month 3
Price 200
Summary     Taiwan, situated in the subtropics, experiences a hot, humid, and saline island climate, making metal components highly susceptible to corrosion. Therefore, it is essential to establish a local corrosion database to serve as a basis for corrosion-resistant design and maintenance management of structures. The main tasks of this project include: 1. Investigation of atmospheric corrosion factors in Taiwan and exposure testing of metal materials; 2. Underwater corrosion exposure testing and seawater quality investigation; 3. Refinement and expansion of the corrosion database; 4. Correlation analysis between carbon steel metal corrosion and corrosion factors.
    The research findings indicate that the deposition rate of chloride salts is higher in the northern to western coastal areas during the autumn and winter seasons. Among the vertical coastal test lines, the average chloride salt deposition rate is higher along the Formosa Plastics Sixth Naphtha Cracker Complex test line. The deposition rate of sulfur dioxide, except for areas near the sulfur region in Yangmingshan National Park, is mostly higher in the western coal-fired power plants and industrial areas, with higher rates observed during the autumn and winter seasons. Specific test points, such as the Changhua Coastal Industrial Zone, Guanyin Industrial Zone, and Guantian Industrial Zone, exhibit higher values.
    Comparison of the corrosion rates along various vertical coastal test lines for different metal types reveals that the corrosion rate of carbon steel is higher along four test lines in the western to northern regions, including Keelung, Taoyuan, Taichung Harbor, and Formosa Plastics Sixth Naphtha Cracker Complex. Moreover, the corrosion rates are generally higher during the autumn and winter seasons. Zinc metal exhibits higher corrosion rates during the autumn and winter seasons along five test lines, including Keelung, Taoyuan, Taichung Harbor, Formosa Plastics Sixth Naphtha Cracker Complex, and Hualien Harbor, with significant seasonal differences. Copper metal shows more severe corrosion rates along two test lines, namely Formosa Plastics Sixth Naphtha Cracker Complex and Taichung Harbor. Aluminum metal experiences higher corrosion rates along three test lines in the western region, including Taoyuan, Taichung Harbor, and Formosa Plastics Sixth Naphtha Cracker Complex, with higher rates observed during the autumn and winter seasons.
    The correlation analysis between carbon steel metal and corrosion factors involved the application of regression analysis to establish a regression model between corrosion factors and the corrosion rate of carbon steel. The results indicate that the corrosion rate of carbon steel is primarily influenced by five corrosion factors: percentage of wetting time, chloride salt deposition rate, sulfur dioxide deposition rate, wind speed, and wind direction. The relationship between these factors and the corrosion rate follows a logarithmic linear pattern.
Benefits and Applications:
    The results are provided for construction bodies to understand the corrosive environmental tendency where the structures are, and can be provided as reference for all industrial, governmental and academic entities such as Taiwan International Ports Corporation, the Corrosion Engineering Association of R.O.C., the Industrial Development Bureau of MOEA, FPG, China Steel Corporation, engineering consultants.
Post date 2024/03/28
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