Analysis on Local Adhesion Differences of Hot Dip Galvanized Coating on Low-Alloy High-Strength Angle Steel

GU Jiayu, LIANG Guowei, LAI Delin, WAN Xianlan, CHE Chunshan

doi:10.16577/j.issn.1001-1560.2022.0359

Materials Protection >

2022 , Vol. 55 >Issue 12: 204 - 207

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0359

Analysis on Local Adhesion Differences of Hot Dip Galvanized Coating on Low-Alloy High-Strength Angle Steel

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(1. Changshu Fengfan Power Equipment Co.， Ltd.， Changshu 215551， China；2. School of Material and Engineering， South China University of Technology， Guangzhou 510640， China)

Received date: 2022-07-12

Revised date: 2022-08-24

Accepted date: 2022-09-20

Online published: 2023-12-27

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Abstract

The reasons for the local adhesion differences of the hot-dip galvanized coating on high-strength angle steel were analyzed by means of scanning electron microscopy (SEM) and optical microscopy (OM)， and the microstructures of the coating and steel base in the good bonding area and poor bonding area of galvanized angle steel were compared. Results showed that: (1) The adhesion difference of the coating on steel substrate were closely related to the microstructure of the caoting. The coating area with good bonding strength was characterized with small column-like or lumpy ζ phase and discontinuous δ phase. When the coating suffering hammering， the hammered area was generally in the form of pits， and the alloy layer was extruded and deformed without cracks. The coating area with poor bonding strength consisted of a coarse columnar or bulky ζ phase and a continuous and thick δ layer， which would be stripped from the substrate interface when the coating suffering hammering. (2) Moreover， the surface microstructure of steel substrate had influence on the galvanized coating. During galvanizing， equilibrium structure was in favor of the diffusion of Fe， facilitating the growth of ζ and limiting the growth of δ， which was beneficial to the bonding between coating and substrate. However， the appearance of non-equilibrium structure could inhibit the diffusion of Fe， lower the growth of ζ and benefit to the growth of δ because of the solution strengthening，lattice distortion and internal residual stress，which was harmful for the bonding strength of hot-dip galvanized coating.

Key words： high-strength steel; galvanizing; bonding; transmission tower

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GU Jiayu, LIANG Guowei, LAI Delin, WAN Xianlan, CHE Chunshan . Analysis on Local Adhesion Differences of Hot Dip Galvanized Coating on Low-Alloy High-Strength Angle Steel[J]. Materials Protection, 2022 , 55(12) : 204 -207 . DOI: 10.16577/j.issn.1001-1560.2022.0359

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