Corrosion Behavior of 55%Al-Zn Alloy Coated Steel Sheet near its Shear Cut Edge in Salt Spray Test

Matsumoto, Masamitsu; Kimoto, Masanari; Sakoda, Akito; Kudou, Takeo

doi:10.2355/tetsutohagane1955.91.9_700

Cited by 7 publications

(7 citation statements)

References 1 publication

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“…4) The time when the iron rust started to propagate over the coating from the edge of the sheet was evaluated. The iron rust on the exposed steel is not discussed in this study.…”

Section: Time To Formation Of Iron Rustmentioning

confidence: 99%

“…The width of xϭ10 mm which is larger than actual thickness of steel sheet, contributes to reducing the test period as described in the previous paper and is within the range of galvanic action during a saltspray test using 5% NaCl solution. 4) A galvanic couple electrode composed of Fe and Al-Zn alloy (AZ) was also prepared as shown in Fig. 2.…”

Section: Specimensmentioning

confidence: 99%

“…Therefore, we started a study to clarify the difference in corrosion mechanisms between what happens in a saltspray test and what happens in real conditions. 4) It has been already indicated that the corrosion behavior of coating materials in salt-spray test is different from that in an outdoor exposure test. 5) Therefore, many kinds of corrosion testing methods have been proposed for automotive materials.…”

Section: Introductionmentioning

confidence: 99%

“…We also revealed that the corrosion of the coating near the cut edge is mainly controlled by oxygen reduction on iron exposed at the edge. 4) In order to reveal the difference in corrosion mechanisms between what happens in NaCl solution and what happens in artificial seawater, the salt-spray test using artificial seawater was also carried out. We confirmed that Mg 2ϩ which modifies the corrosion products on iron suppresses the cathodic reaction.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Environmental Conditions on the Corrosion near Shear Cut Edge of 55 mass% Al–Zn Alloy Coated Steel Sheets

Matsumoto¹,

Okada²,

Nishihara³

et al. 2011

ISIJ Int.

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The purpose of this study is to clarify the effect of dry and wet processes on the mechanisms of edge corrosion of hot dip 55 mass% Al-Zn alloy coated steel sheet. The corrosion tests employed were continuous salt-spray tests and cyclic corrosion tests using NaCl solution or artificial seawater. It was confirmed that the edge corrosion is suppressed during the salt-spray test using artificial seawater. Furthermore, the suppression was not prevented by dry and wet processes. In order to reveal the corrosion mechanisms, the galvanic current and the cathodic polarization curves at exposed steel were measured and the corrosion products were characterized. It is suggested that the artificial seawater forms anti-corrosive corrosion products and that suppress the cathodic reaction on the steel which is exposed on the shear cut edge. The corrosion products are not changed by dry and wet processes. The numerical analysis also revealed the influence of the dry and wet process on edge corrosion.KEY WORDS: 55 mass% Al-Zn alloy coated steel sheet; edge corrosion; artificial seawater; salt-spray test; dry and wet processes; numerical analysis; X-ray diffractometry (XRD); Fourier transform infrared spectroscopy (FTIR)

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“…4) The time when the iron rust started to propagate over the coating from the edge of the sheet was evaluated. The iron rust on the exposed steel is not discussed in this study.…”

Section: Time To Formation Of Iron Rustmentioning

confidence: 99%

Section: Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Environmental Conditions on the Corrosion near Shear Cut Edge of 55 mass% Al–Zn Alloy Coated Steel Sheets

Matsumoto¹,

Okada²,

Nishihara³

et al. 2011

ISIJ Int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…4) This phenomenon is explained by the galvanic model: the coating is anode and the steel exposed at the end of the edge is cathode. 5) It is pointed out that the salts of multi-component system containing sea salt or other salts, or both, influence the thickness and the composition of the water film in actual environments, 6) and they have the possibility of affecting the corrosion phenomenon. In addition, although the test methods using sea salt are proposed, 7) the influence of the component ions on the corrosion mechanisms is not clarified.…”

Section: Introductionmentioning

confidence: 99%