Development and characterization of Zn-Ni, Zn-Co and Zn-Ni-Co coatings

被引：35

作者：

Bhat, Ramesh S. ^{[1
,2
,4
]}

Shet, Vinayak B. ^{[2
,3
]}

机构：

[1] NMAM Inst Technol, Dept Chem, Karkala, India

[2] Visvesvaraya Technol Univ, Belagavi, India

[3] NMAM Inst Technol, Dept Biotechnol, Karkala, India

[4] NMAM Inst Technol, Dept Chem, Nitte 574110, Karnataka, India

来源：

SURFACE ENGINEERING | 2020年 / 36卷 / 04期

关键词：

Electroplating; XRD; Faradays efficiency; sulphamic acid; corrosion; ALLOY COATINGS; CORROSION-RESISTANCE; ELECTRODEPOSITION; COBALT; STEEL;

D O I：

10.1080/02670844.2019.1680037

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Acidic sulphate baths having ZnSO4 7H(2)O, NiSO4 7H(2)O, CoSO4 7H(2)O and sulphamic acid (SA) were optimized for the deposition of smooth Zn-Ni, Zn-Co and Zn-Ni-Co coatings on mild steel substrate. Bath compositions and deposition conditions were optimized by Hull cell method for maximum efficiency against depositions in corrosion. Faradic efficacy exceeded 90% as the current density increased; increased wt-% of nobler metal content (Ni and Co) in the deposit. Potentiodynamic polarization and electrochemical impedance spectroscopy indicates that the Zn-Ni-Co coating; corrosion resistance was 28 times higher than the Zn-Ni and 21 times higher than the Zn-Co coating. The good corrosion resistance of the Zn-Ni-Co coating was ascribed to its phase structure and the surface morphology. New cheap sulphate baths have been suggested for bright and uniform coating of Zn-Ni, Zn-Co and Zn-Ni-Co and result have been discussed.

引用

页码：429 / 437

页数：9

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