[논문]스테인리스강과 양극산화된 알루미늄 합금의 전기화학적 부식특성에 미치는 해수온도의 영향

정상옥; 김성종

doi:10.14773/cst.2021.20.2.85

[국내논문] 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 원문보기

Corrosion science and technology, v.20 no.2, 2021년, pp.85 - 93

정상옥 (디엔브이코리아유한회사 기자재검사부) , 김성종 (목포해양대학교기관시스템공학부)

Abstract ▼ AI-Helper

The corrosion damage of materials in marine environment mainly occurs by Cl- ions due to the breakdown of passive films. Additionally, various characteristics in seawater such as salinity, temperature, immersion time, flow rate, and biological activity also affect corrosion characteristics. In this study, the corrosion characteristics of stainless steels (STS 304 and STS 316L) and anodized aluminum alloys (AA 3003 and AA 6063) were evaluated with seawater temperature parameters. A potentiodynamic polarization experiment was conducted in a potential range of -0.25 V to 2.0 V at open circuit potential (OCP). Corrosion current density and corrosion potential were obtained through the Tafel extrapolation method to analyze changes in corrosion rate due to temperature. Corrosion behavior was evaluated by measuring weight loss before/after the experiment and also observing surface morphology through a scanning electronic microscope (SEM) and 3D microscopy. 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 an increase in corrosion rate. There was lower pitting damage and lower corrosion current density for anodized aluminum alloys than for stainless steels as the temperature increased.

주제어

표/그림 (16)

표 Table 1. Chemical composition of (a) STS 304 and STS 316L and (b) AA 3003 and AA 6063 (wt%)
표 Table 2. Chemical compositions and properties of natural seawater
그림 Fig. 1. Potentiodynamic polarization curves in seawater of STS 304 and STS 316L
그림 Fig. 2. Surface morphology of STS 304 and STS 316L after potentiodynamic polarization experiment in seawater
표 Table 3. Tafel analysis of STS 304 and STS 316L after potentiodynamic polarization experiment in seawater
그림 Fig. 3. 3D micrographs of STS 304 and STS 316L after potentiodynamic polarization experiment in seawater
그림 Fig. 4. (a) Weight loss and (b) maximum damage depth of STS 304 and STS 316L after potentiodynamic polarization experiment in seawater
그림 Fig. 5. Potentiodynamic polarization curves in seawater of anodized AA 3003 and AA 6063
그림 Fig. 6. Surface morphology of anodized AA 3003 and AA 6063 after potentiodynamic polarization experiment in seawater
표 Table 4. Tafel analysis of anodized AA 3003 and AA 6063 after potentiodynamic polarization experiment in seawater
그림 Fig. 7. 3D micrographs of anodized AA 3003 and AA 6063 after potentiodynamic polarization experiment in seawater
그림 Fig. 9. Pitting mechanism of (a) stainless steel and (b) aluminum alloy in seawater
그림 Fig. 8. (a) Weight loss and (b) maximum damage depth of anodized AA 3003 and AA 6063 after potentiodynamic polarization experiment in seawater
그림 Fig. 10. Comparison of corrosion current density of stainless steel (STS 304 and STS 316L) and anodized aluminum alloy (AA 3003 and AA 6063) after poten-tiodynamic polarization experiment in seawater
그림 Fig. 11. Comparison of weight loss and maximum damage depth of stainless steel (STS 304 and STS 316L) and anodized aluminum alloy (AA 3003 and AA 6063) after potentiodynamic polarization experiment in seawater
표 Table 5. Comparison of corrosion characteristics of stainless steel (STS 304 and STS 316L) and anodized aluminum alloy (AA 3003 and AA 6063) after potentiodynamic polarization experiment in seawater

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