스테인리스강과 양극산화된 알루미늄 합금의 전기화학적 부식특성에 미치는 해수온도의 영향
The Effect of Seawater Temperature on the Electrochemical Corrosion Behaviour of Stainless Steels and Anodized Aluminum Alloys
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The corrosion damage of materials in marine environment mainly occurs by Cl-ions due to the breakdownof passive films. Additionally, various characteristics in seawater such as salinity, temperature, immersiontime, flow rate, and biological activity also affect corrosion characteristics. In this study, the corrosioncharacteristics of stainless steels (STS 304 and STS 316L) and anodized aluminum alloys (AA 3003 andAA 6063) were evaluated with seawater temperature parameters. A potentiodynamic polarization experi ment was conducted in a potential range of -0.25 V to 2.0 V at open circuit potential (OCP). Corrosion cur rent density and corrosion potential were obtained through the Tafel extrapolation method to analyze changes incorrosion rate due to temperature. Corrosion behavior was evaluated by measuring weight loss before/after theexperiment and also observing surface morphology through a scanning electronic microscope (SEM) and 3Dmicroscopy. Weight loss, maximum damage depth and pitting damage increased as seawater temperature increased,and furthermore, the tendency of higher corrosion current density with an increase of temperature attributed to anincrease in corrosion rate. There was lower pitting damage and lower corrosion current density for anodized alu minum alloys than for stainless steels as the temperature increased.
Abstract
The corrosion damage of materials in marine environment mainly occurs by Cl-ions due to the breakdownof passive films. Additionally, various characteristics in seawater such as salinity, temperature, immersiontime, flow rate, and biological activity also affect corrosion characteristics. In this study, the corrosioncharacteristics of stainless steels (STS 304 and STS 316L) and anodized aluminum alloys (AA 3003 andAA 6063) were evaluated with seawater temperature parameters. A potentiodynamic polarization experi ment was conducted in a potential range of -0.25 V to 2.0 V at open circuit potential (OCP). Corrosion cur rent density and corrosion potential were obtained through the Tafel extrapolation method to analyze changes incorrosion rate due to temperature. Corrosion behavior was evaluated by measuring weight loss before/after theexperiment and also observing surface morphology through a scanning electronic microscope (SEM) and 3Dmicroscopy. Weight loss, maximum damage depth and pitting damage increased as seawater temperature increased,and furthermore, the tendency of higher corrosion current density with an increase of temperature attributed to anincrease in corrosion rate. There was lower pitting damage and lower corrosion current density for anodized alu minum alloys than for stainless steels as the temperature increased.
참고문헌 (15)
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