The Corrosion Resistance and Mechanism of AT13/Fe-Based Amorphous Composite Coatings.

Zhenhua Chu,Yuyun Zhou,Fang Wang,Jingxiang Xu,Shikun Teng,Baosen Zhang,Xingwei Zheng

doi:10.3390/mi13010056

Abstract

Due to high strength, high wear resistance and high corrosion resistance, the amorphous metallic glasses were investigated widely. In the present study, the corrosion resistance of amorphous coating and composite coatings with various proportions of AT13 (Al2O3–13 wt.% TiO2) ceramic as additions in 3.5 wt.% NaCl solution were studied. The corrosion resistance was improved obviously as the addition of AT13, and when the content of AT13 was 15 wt.%, the composite coating had the lowest corrosion current density (1.75 × 10−6 A cm−2) and the highest corrosion potential (−411 mV), which was 5.14 × 10−5 A cm−2 and −580 mV for Fe-based metallic glassy coating, respectively. The corrosion mechanism was proposed according to the long-time immersion corrosion test.

Highlights

Amorphous Composite Coatings. bulk metallic glasses (BMGs) exhibit ultrahigh hardness and strength, and superior corrosion resistance and wear resistance [1,2,3,4], metallic glasses are seldom used in engineering because of the limitation of the glassy formation ability
The crystal peak corresponding to the γ-Al2 O3 phase appeared in the spectrum of the composite coatings, and the intensity of the diffraction peak increased with the increase of the added content
The results indicate high corrosion resistance of Fe-based composite coatings with an obvious activation zone, transition zone, passivation and overpassivation zone

Summary

Introduction

Bulk metallic glasses (BMGs) exhibit ultrahigh hardness and strength, and superior corrosion resistance and wear resistance [1,2,3,4], metallic glasses are seldom used in engineering because of the limitation of the glassy formation ability. The metallic glassy coating can be fabricated by the spraying method [5]. Due to the deformation mechanism of bulk metallic glasses, which depends on the development of shear bands, it exhibits poor plastic deformation. A great amount of research efforts have been devoted to fabricating bulk metallic glassy composites (BMGCs) to improve the plasticity of BMGs by introducing ductile metallic crystalline or ceramic phases with high strength into the metallic glassy matrix in order to form multiple shear bands

Methods

Results

Conclusion