[논문]전기 아연도금용 유색 크로메이트에 대한 건조 온도의 영향

전수병; 최지원; 손병기; 손인준

doi:10.5695/jsse.2023.56.5.289

전기 아연도금용 유색 크로메이트에 대한 건조 온도의 영향
The Effects of Drying Temperature on Chromate Treatment for Electroplated Zinc 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.56 no.5, 2023년, pp.289 - 298

전수병 (경북대학교 금속신소재공학과) , 최지원 ((주)일성도금 기업부설연구소) , 손병기 ((주)일성도금 기업부설연구소) , 손인준 (경북대학교 금속신소재공학과)

Abstract ▼ AI-Helper

In this study, the effect of drying temperature on characteristics of the trivalent chromate film on electroplated zinc was investigated. An zinc-electroplated iron specimen with a thickness of 5 ㎛ was used for chromate treatment. Chromate treatment was conducted in a solution diluted 10 times from a mixture of Cr(NO3)3·9H20 360 g/L, Co(NO3)2·6H2O 60 g/L, Na2SO4 60 g/L, NH4F·HF 25 g/L, and NaOH 20 g/L. The zinc electroplated specimen was treated using the chromate solution with pH 2.0 at 25 ℃ for 60 s. Subsequently, chromate-treated samples were dried in an electric furnace for 2h with temperature varied from 25 to 125 ℃. The corrosion rate increased with the increase in the drying temperature, and the surface morphology of the chromate-treated film was observed using FE-SEM. When the drying temperature changed, the color of the chromate film changed from green to yellow, and the thickness of the film changed from 362 to 241 nm, respectively. Additionally, corrosion resistance was evaluated via a salt spray test.

주제어

표/그림 (19)

그림 Fig. 1. Schematic of the polarization process.
표 Table 1 Drying temperature and drying time of chromate-treated specimens in this study.
그림 Fig. 2. Polarization curves of Zn trivalent chromatetreated coatings with various drying temperature in 3 wt% NaCl solution.
그림 Fig. 3. Corrosion potential (left) and corrosion current density (right) obtained from polarization curves of trivalent chromate-treated coatings with various drying temperatures.
그림 Fig. 4. Corrosion rate of trivalent chromate-treated coatings with various drying temperature.
그림 Fig. 5. Surface morphology of (a) Zn plating(non chromate-treated coating), (b)trivalent chromate-treated coatings dried at 25 ℃, (c)50 ℃, (d)75 ℃, (e)100 ℃ and (f)125 ℃.
그림 Fig. 6. FE-SEM images and EDX element mappings of (a) Zn plating(non chromate-treated coating), (b)trivalent chromate-treated coatings dried at 25 ℃, (c)50 ℃, (d)75 ℃, (e)100 ℃ and (f)125 ℃.
그림 Fig. 9. Appearance color of real chromate-treated specimen.
그림 Fig. 7. Schematic of the Coloured Chromate.
그림 Fig. 8. Graphical representations of a*, b* values and SCE colors of trivalent chromatetreated coatings with various drying temperature; (a) 25 ℃, (b) 50 ℃, (c) 75 ℃, (d) 100 ℃, (e) 125 ℃
표 Table 2. Change in color indexes of chromate film with different drying temperatures.
그림 Fig. 10. Cross section morphology and film thickness of chromate-treated coatings dried at (a) 25 ℃, (b) 50 ℃, (c) 75 ℃, and (d) 100 ℃
그림 Fig. 11 FE-TEM images and EDX element mappings of chromate-treated coatings dried at (a) 25 ℃, (b) 50 ℃, (c) 75 ℃, and (d) 100 ℃.
그림 Fig. 12 Thickness of trivalent chromate-treated coating films with various drying temperature.
그림 Fig. 13. Appearance of Zn electroplated specimen without chromate treatment before (left) and after (right) 24h of salt spray test
그림 Fig. 14 Appearance of chromate-treated specimens with various drying temperatures after 240h of salt spray test.
그림 Fig. 15 Appearance of chromate-treated specimens with various drying temperatures after 360h of salt spray test.
표 Table 3. Anticorrosion According to Drying Condition of Hexavalent Chromate Film (Hr) [2]
표 Table 4. Anticorrosion According to Drying Condition of trivalent Chromate Film (Hr)

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