Corrosion protection investigations of oxide‐silane composite coating on hot dip aluminized steel

The hot dip aluminized ASTM 1035 steels (Al‐coated steel) underwent anodic oxidization, and various thicknesses of Al2O3 coating were applied to the surface of the Al‐coated steels (Al–Al2O3‐coated steel). The corrosion resistance of the Al–Al2O3‐coated steel was investigated using potentiodynamic t...

Full description

Saved in:
Bibliographic Details
Published in:Materials and corrosion 2025-01, Vol.76 (1), p.87-98
Main Authors: Liu, Zhong‐Xia, Shi, Lei, Jiang, Ai‐Yun, Liu, Jian‐Xiu, Zhang, Bao‐Feng, Zhou, Ya‐Jun, Zhang, Guo‐Peng
Format: Article
Language:English
Subjects:
Aluminum oxide
Anodic coatings
Anodic protection
Anodizing
ASTM 1035 steel
Bimetals
Carbon fiber reinforced plastics
Carbon fiber reinforcement
Cf/PA6 composites
Corrosion prevention
Corrosion resistance
Corrosion resistant steels
Corrosion tests
Current density
Electrochemical impedance spectroscopy
Fiber composites
Fiber reinforced polymers
Galvanic corrosion
galvanic corrosion resistance
Hot dip aluminizing
Immersion coating
Nylon 6
Oxidation resistance
Permeability
silane sealing
Silanes
Steel
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The hot dip aluminized ASTM 1035 steels (Al‐coated steel) underwent anodic oxidization, and various thicknesses of Al2O3 coating were applied to the surface of the Al‐coated steels (Al–Al2O3‐coated steel). The corrosion resistance of the Al–Al2O3‐coated steel was investigated using potentiodynamic tests, electrochemical impedance spectroscopy tests and measurement of galvanic current density in a bimetallic cell. It was found that the anodic oxidation resulted in the formation of a porous Al2O3 coating on the surface of the Al‐coated steel, improving both its corrosion resistance and galvanic corrosion resistance when coupled with carbon fiber reinforced nylon 6 composite (Cf/PA6). Silane treatment effectively sealed the pores within the Al2O3 coating, resulting in improved corrosion protection for Al–Al2O3‐coated steel due to the exceptional insulation, impermeability and hydrophobic properties of silane coating. Compared to the Al‐coated steel/carbon fiber reinforced polymer (CFRP) couple and Al–Al2O3‐coated steel/CFRP couple, stable galvanic current density decreased by approximately 75% and 45%, respectively. Silane treatment effectively sealed the pores within the Al2O3 coating, resulting in improved corrosion protection for Al–Al2O3‐coated steel due to the exceptional insulation, impermeability and hydrophobic properties of silane coating.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.202414506