Corrosion behaviour of detonation gun sprayed cermet coatings on AA5083

被引:12
|
作者
Arunnellaiappan, T. [1 ]
Baskaran, S. [1 ]
Arun, S. [2 ]
Prithivirajan, R. [1 ]
机构
[1] Madanapalle Inst Technol & Sci, Dept Mech Engn, Madanapalle 517325, India
[2] Indian Inst Sci, Mat Engn, Bangalore, Karnataka, India
关键词
Detonation gun spray; corrosion; aluminium alloys; cermet coatings; marine applications; Thermal spray coatings; WC-Co-Cr; Cr3C2-NiCr; MICROSTRUCTURE; CRACKING; ALLOY;
D O I
10.1080/02670844.2020.1807096
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Cermet coatings were fabricated on AA5083 by D gun coating technique using three different combinations of powder feedstock namely WC-Co, WC-Co-Cr, and Cr3C2-NiCr. The effect of powder combinations on coatings' phase composition, surface morphology, and cross-sectional microstructure were investigated using XRD, SEM, and EDS. Major findings revealed that WC-Co and WC-Co-Cr powders produced higher thickness with considerable surface defects compared to a coating that was produced by Cr3C2-NiCr powders. Moreover, a smooth compact and a uniform coating was obtained by using Cr3C2-NiCr powders. Electrochemical corrosion results showed that the OCP values of all the coated samples were shifted to a higher value than substrate and sample coated with Cr3C2-NiCr powder showed a stable OCP and more positive value than other coated samples. Similarly, the PDP curve of sample coated with Cr3C2-NiCr also showed lower corrosion current density at the cathodic region and better passivation behaviour in the anodic region.
引用
收藏
页码:263 / 270
页数:8
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