Effect provided by dispersed phase on the morphology and properties of composite zinc coatings

R.E Fomina,R.S Sayfullin,S.V Vodopyanova,G.G Mingazova,A Glezer,S Roshchupkin

doi:10.1051/matecconf/202032902025

Abstract

We studied the composition of electrochemical titanium and silicon zinc dioxide coatings, as well as the special aspects of their morphology and corrosion resistance. It is found that the particles of TiO2 are included into the zinc matrix. Share of dispersed phase in CEC grows with increasing the concentration of particles in the suspended electrolyte. It is shown that the SiO2 particles are not included into the coating, inhibiting the process of cathodic reduction of zinc. It is also found that crystals on all the coatings obtained have a hexagonal structure, while introducing the dispersed phase particles leads to the plating structure refinement. It is shown that including the TiO2 particles leads to forming the coatings of better corrosion resistance.

Highlights

Developing composite electrochemical coatings (CEC) is one of the key areas in the modern electroplating.Principle of obtaining CECs is based on coprecipitating dispersed particles of different size together with metals from suspended electrolytes
In our case, when obtaining coatings from a pure zincing electrolyte, the zinc current yield is 98.4 %. For this current yield (98.4%), high-quality zinc coatings were obtained at 5 A/dm2
It is found that dispersed-phase particles reduce the zinc current yield with increasing the concentration of the particles

Summary

Introduction

Developing composite electrochemical coatings (CEC) is one of the key areas in the modern electroplating. Principle of obtaining CECs is based on coprecipitating dispersed particles of different size together with metals from suspended electrolytes. The dispersed phase enhances their performance, such as hardness, durability, and corrosion resistance, and give them new properties, such as antifriction, magnetism, or catalytic properties. TiO2 particles are known to be used in enhancing the micro hardness and corrosion resistance of nickel-matrix coatings [2], and the TiO2 particles are a component of the Zn/TiO2 catalyst of steam methane reforming [3]. Obtaining zinc-matrix CECs in presence of the TiO2 particles is still poorly known. This paper studies how titanium and silicon dioxides affect developing zinc-matrix composite electrochemical coatings

Experiment

Experimental results and discussions

Conclusions