Transcription of UNIT 4 METAL COATING PROCESSES Metal Coating …
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UNIT 4 METAL COATING PROCESSES Metal Coating …
33 METAL COATING PROCESSES UNIT 4 METAL COATING PROCESSES Structure Introduction Objectives METAL and Non- METAL Coatings Metallic Coatings Non-Metallic Coatings Electroforming Galvanizing Anodizing Organic Coatings Summary INTRODUCTION COATING is a covering that can be applied to the surface of an object, normally called as substrate. The purpose of application of COATING is the value enhancement of the substrate by improving its appearance, corrosion resistant property, wear resistance, etc. Process of COATING involves application of thin film of functional material to a substrate. The functional material may be metallic or non-metallic; organic or inorganic; solid, liquid or gas. This can be genuine criteria of classification of coatings. Objectives After studying this unit, you should be able to metallic and non-metallic coatings their comparison, different COATING PROCESSES , applications of various COATING PROCESSES , and advantages and disadvantages of coatings.
4.2.2 Metallic Coatings Metallic coating can be applied over metallic as well as non-metallic substrates. Sometimes non-metallic like plastics are coated to give metallic appearance. Some important metallic coating methods are described below. Electroplating Electroplating is also known as electro-chemical plating, is an electrolytic process.
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