Influence of alloy content on microstructure and corrosion resistance of zn-based alloy coated steel product

Jae Won Lee; Sung Jin Kim; Min Suk Oh

doi:10.3365/KJMM.2020.58.3.169

Influence of alloy content on microstructure and corrosion resistance of zn-based alloy coated steel product

Jae Won Lee
, Sung Jin Kim^*
, Min Suk Oh

^*Corresponding author for this work

Metallurgical System Engineering

Pohang Institute of Metal Industry Advancement
Sunchon National University

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

8 Scopus citations

Abstract

The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn₂ binary eutectic, Zn/Al binary eutectoid and Zn/Al/MgZn₂ ternary eutectic phases were formed in the coating layer. The surface and cut-edge corrosion resistance of the Zn-based alloy coating were superior to those of the Zn coating. Zn-based alloy coating containing 15% Al and 3% Mg showed the best corrosion resistance, with red rust formed on the flat surface after 120 hours in the salt spray test. The corrosion products of the Zn-based alloy coating consisted of Simonkolleite (Zn₅(OH)₈Cl₂·H₂O), Hydrozincite (Zn₅(CO₃)₂(OH) and zinc oxide (ZnO). Al-containing corrosion products, Zn₂Al(OH)₆Cl₂·H₂O and Al₂O₃, were formed when more than 5 wt% Al was added. Al-containing corrosion products improved the corrosion resistance of the flat surface of Zn-based alloy coating, but did not affect corrosion resistance in the cut-edge area.

Original language	English
Pages (from-to)	169-174
Number of pages	6
Journal	Journal of Korean Institute of Metals and Materials
Volume	58
Issue number	3
DOIs	https://doi.org/10.3365/KJMM.2020.58.3.169
State	Published - 2020

Keywords

Microstructure
Surface treatment
Thin film
Wet coating

Quacquarelli Symonds(QS) Subject Topics

Materials Science
Mathematics

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10.3365/KJMM.2020.58.3.169

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title = "Influence of alloy content on microstructure and corrosion resistance of zn-based alloy coated steel product",

abstract = "The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn2 binary eutectic, Zn/Al binary eutectoid and Zn/Al/MgZn2 ternary eutectic phases were formed in the coating layer. The surface and cut-edge corrosion resistance of the Zn-based alloy coating were superior to those of the Zn coating. Zn-based alloy coating containing 15\% Al and 3\% Mg showed the best corrosion resistance, with red rust formed on the flat surface after 120 hours in the salt spray test. The corrosion products of the Zn-based alloy coating consisted of Simonkolleite (Zn5(OH)8Cl2·H2O), Hydrozincite (Zn5(CO3)2(OH) and zinc oxide (ZnO). Al-containing corrosion products, Zn2Al(OH)6Cl2·H2O and Al2O3, were formed when more than 5 wt\% Al was added. Al-containing corrosion products improved the corrosion resistance of the flat surface of Zn-based alloy coating, but did not affect corrosion resistance in the cut-edge area.",

keywords = "Microstructure, Surface treatment, Thin film, Wet coating",

author = "Lee, \{Jae Won\} and Kim, \{Sung Jin\} and Oh, \{Min Suk\}",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 The Korean Institute of Metals and Materials.",

year = "2020",

doi = "10.3365/KJMM.2020.58.3.169",

language = "English",

volume = "58",

pages = "169--174",

journal = "Journal of Korean Institute of Metals and Materials",

issn = "1738-8228",

number = "3",

}

TY - JOUR

T1 - Influence of alloy content on microstructure and corrosion resistance of zn-based alloy coated steel product

AU - Lee, Jae Won

AU - Kim, Sung Jin

AU - Oh, Min Suk

PY - 2020

Y1 - 2020

N2 - The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn2 binary eutectic, Zn/Al binary eutectoid and Zn/Al/MgZn2 ternary eutectic phases were formed in the coating layer. The surface and cut-edge corrosion resistance of the Zn-based alloy coating were superior to those of the Zn coating. Zn-based alloy coating containing 15% Al and 3% Mg showed the best corrosion resistance, with red rust formed on the flat surface after 120 hours in the salt spray test. The corrosion products of the Zn-based alloy coating consisted of Simonkolleite (Zn5(OH)8Cl2·H2O), Hydrozincite (Zn5(CO3)2(OH) and zinc oxide (ZnO). Al-containing corrosion products, Zn2Al(OH)6Cl2·H2O and Al2O3, were formed when more than 5 wt% Al was added. Al-containing corrosion products improved the corrosion resistance of the flat surface of Zn-based alloy coating, but did not affect corrosion resistance in the cut-edge area.

AB - The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn2 binary eutectic, Zn/Al binary eutectoid and Zn/Al/MgZn2 ternary eutectic phases were formed in the coating layer. The surface and cut-edge corrosion resistance of the Zn-based alloy coating were superior to those of the Zn coating. Zn-based alloy coating containing 15% Al and 3% Mg showed the best corrosion resistance, with red rust formed on the flat surface after 120 hours in the salt spray test. The corrosion products of the Zn-based alloy coating consisted of Simonkolleite (Zn5(OH)8Cl2·H2O), Hydrozincite (Zn5(CO3)2(OH) and zinc oxide (ZnO). Al-containing corrosion products, Zn2Al(OH)6Cl2·H2O and Al2O3, were formed when more than 5 wt% Al was added. Al-containing corrosion products improved the corrosion resistance of the flat surface of Zn-based alloy coating, but did not affect corrosion resistance in the cut-edge area.

KW - Microstructure

KW - Surface treatment

KW - Thin film

KW - Wet coating

UR - https://www.scopus.com/pages/publications/85084977003

U2 - 10.3365/KJMM.2020.58.3.169

DO - 10.3365/KJMM.2020.58.3.169

M3 - Journal article

AN - SCOPUS:85084977003

SN - 1738-8228

VL - 58

SP - 169

EP - 174

JO - Journal of Korean Institute of Metals and Materials

JF - Journal of Korean Institute of Metals and Materials

IS - 3

ER -

Influence of alloy content on microstructure and corrosion resistance of zn-based alloy coated steel product

Abstract

Keywords

Quacquarelli Symonds(QS) Subject Topics

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