Surface and cut-edge corrosion behavior of Zn-Mg-Al alloy-coated steel sheets as a function of the alloy coating microstructure

Min Suk Oh; Sang Heon Kim; Jong Sang Kim; Jae Won Lee; Je Ha Shon; Young Sool Jin

doi:10.1007/s12540-015-5411-9

Surface and cut-edge corrosion behavior of Zn-Mg-Al alloy-coated steel sheets as a function of the alloy coating microstructure

Min Suk Oh^*
, Sang Heon Kim
, Jong Sang Kim
, Jae Won Lee
, Je Ha Shon
, Young Sool Jin

^*Corresponding author for this work

Metallurgical System Engineering

POSCO
POMIA (Pohang Institute of Metal Industry Advancement)
Pohang University of Science and Technology

Research output: Contribution to journal › Journal article › peer-review

74 Scopus citations

Abstract

The effects of Mg and Al content on the microstructure and corrosion resistance of hot-dip Zn-Mg-Al alloycoated steel sheets were investigated. Pure Zn and Zn-based alloy coatings containing Mg (0-5 wt%) and Al (0.2-55 wt%) were produced by a hot-dip galvanizing method. Mg and Al addition induced formation of intermetallic microstructures, like primary Zn, Zn/MgZn₂ binary eutectic, dendric Zn/Al eutectoid, and Zn/Al/MgZn₂/ternary eutectic structures in the coating layer. MgZn₂-related structures (Zn/MgZn₂, Zn/Al/MgZn₂, MgZn₂) played an important role in increasing the corrosion resistance of Zn-Mg-Al alloy-coated steel sheets. Zn-3%Mg-2.5%Al coating layer containing a large volume of lamellar-shaped Zn/MgZn₂ binary eutectic structures showed the best cut-edge corrosion resistance. The analysis indicated that Mg dissolved from MgZn₂ in the early stage of corrosion and migrated to the cathodic region of steel-exposed cut-edge area to form dense and ordered protective corrosion products, leading to prolonged cathodic protection of Zn-Mg-Al alloy-coated steel sheets.

Original language	English
Pages (from-to)	26-33
Number of pages	8
Journal	Metals and Materials International
Volume	22
Issue number	1
DOIs	https://doi.org/10.1007/s12540-015-5411-9
State	Published - 2016.01.1

Keywords

coating
corrosion
galvanization
microstructure
Zn-Mg-Al alloy-coated steel sheet

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10.1007/s12540-015-5411-9

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@article{1e3c07fee1dd4c53af645629aa626260,

title = "Surface and cut-edge corrosion behavior of Zn-Mg-Al alloy-coated steel sheets as a function of the alloy coating microstructure",

abstract = "The effects of Mg and Al content on the microstructure and corrosion resistance of hot-dip Zn-Mg-Al alloycoated steel sheets were investigated. Pure Zn and Zn-based alloy coatings containing Mg (0-5 wt\%) and Al (0.2-55 wt\%) were produced by a hot-dip galvanizing method. Mg and Al addition induced formation of intermetallic microstructures, like primary Zn, Zn/MgZn2 binary eutectic, dendric Zn/Al eutectoid, and Zn/Al/MgZn2/ternary eutectic structures in the coating layer. MgZn2-related structures (Zn/MgZn2, Zn/Al/MgZn2, MgZn2) played an important role in increasing the corrosion resistance of Zn-Mg-Al alloy-coated steel sheets. Zn-3\%Mg-2.5\%Al coating layer containing a large volume of lamellar-shaped Zn/MgZn2 binary eutectic structures showed the best cut-edge corrosion resistance. The analysis indicated that Mg dissolved from MgZn2 in the early stage of corrosion and migrated to the cathodic region of steel-exposed cut-edge area to form dense and ordered protective corrosion products, leading to prolonged cathodic protection of Zn-Mg-Al alloy-coated steel sheets.",

keywords = "coating, corrosion, galvanization, microstructure, Zn-Mg-Al alloy-coated steel sheet",

author = "Oh, \{Min Suk\} and Kim, \{Sang Heon\} and Kim, \{Jong Sang\} and Lee, \{Jae Won\} and Shon, \{Je Ha\} and Jin, \{Young Sool\}",

note = "Publisher Copyright: {\textcopyright} 2016, The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.",

year = "2016",

month = jan,

day = "1",

doi = "10.1007/s12540-015-5411-9",

language = "English",

volume = "22",

pages = "26--33",

journal = "Metals and Materials International",

issn = "1225-9438",

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TY - JOUR

T1 - Surface and cut-edge corrosion behavior of Zn-Mg-Al alloy-coated steel sheets as a function of the alloy coating microstructure

AU - Oh, Min Suk

AU - Kim, Sang Heon

AU - Kim, Jong Sang

AU - Lee, Jae Won

AU - Shon, Je Ha

AU - Jin, Young Sool

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The effects of Mg and Al content on the microstructure and corrosion resistance of hot-dip Zn-Mg-Al alloycoated steel sheets were investigated. Pure Zn and Zn-based alloy coatings containing Mg (0-5 wt%) and Al (0.2-55 wt%) were produced by a hot-dip galvanizing method. Mg and Al addition induced formation of intermetallic microstructures, like primary Zn, Zn/MgZn2 binary eutectic, dendric Zn/Al eutectoid, and Zn/Al/MgZn2/ternary eutectic structures in the coating layer. MgZn2-related structures (Zn/MgZn2, Zn/Al/MgZn2, MgZn2) played an important role in increasing the corrosion resistance of Zn-Mg-Al alloy-coated steel sheets. Zn-3%Mg-2.5%Al coating layer containing a large volume of lamellar-shaped Zn/MgZn2 binary eutectic structures showed the best cut-edge corrosion resistance. The analysis indicated that Mg dissolved from MgZn2 in the early stage of corrosion and migrated to the cathodic region of steel-exposed cut-edge area to form dense and ordered protective corrosion products, leading to prolonged cathodic protection of Zn-Mg-Al alloy-coated steel sheets.

AB - The effects of Mg and Al content on the microstructure and corrosion resistance of hot-dip Zn-Mg-Al alloycoated steel sheets were investigated. Pure Zn and Zn-based alloy coatings containing Mg (0-5 wt%) and Al (0.2-55 wt%) were produced by a hot-dip galvanizing method. Mg and Al addition induced formation of intermetallic microstructures, like primary Zn, Zn/MgZn2 binary eutectic, dendric Zn/Al eutectoid, and Zn/Al/MgZn2/ternary eutectic structures in the coating layer. MgZn2-related structures (Zn/MgZn2, Zn/Al/MgZn2, MgZn2) played an important role in increasing the corrosion resistance of Zn-Mg-Al alloy-coated steel sheets. Zn-3%Mg-2.5%Al coating layer containing a large volume of lamellar-shaped Zn/MgZn2 binary eutectic structures showed the best cut-edge corrosion resistance. The analysis indicated that Mg dissolved from MgZn2 in the early stage of corrosion and migrated to the cathodic region of steel-exposed cut-edge area to form dense and ordered protective corrosion products, leading to prolonged cathodic protection of Zn-Mg-Al alloy-coated steel sheets.

KW - coating

KW - corrosion

KW - galvanization

KW - microstructure

KW - Zn-Mg-Al alloy-coated steel sheet

UR - https://www.scopus.com/pages/publications/84953360921

U2 - 10.1007/s12540-015-5411-9

DO - 10.1007/s12540-015-5411-9

M3 - Journal article

AN - SCOPUS:84953360921

SN - 1225-9438

VL - 22

SP - 26

EP - 33

JO - Metals and Materials International

JF - Metals and Materials International

IS - 1

ER -

Surface and cut-edge corrosion behavior of Zn-Mg-Al alloy-coated steel sheets as a function of the alloy coating microstructure

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