Painting and Coating Basics
Surfaces are often painted or coated to protect them against corrosion and degradation. Metal corrosion is of particular concern because it can cause equipment failures, which can lead to safety problems, environmental issues, lost production, and increased costs. Wood surfaces are also often painted or coated to provide protection from insects, fungi, and weathering. Paints and coatings for use on masonry surfaces must be formulated for the high pH levels that are often present. Prior to painting or coating, surfaces must be properly prepared, which may include cleaning, sanding, drying, and sometimes priming, in order to achieve even coverage and good adhesion. [course outline] Purpose of Paint and Coatings Metal Corrosion Concerns What Is Metal Corrosion Preventing Metal Corrosion Protective Coatings – Paint Protective Coatings – Epoxy and Galvanizing Protective Coatings – Powder Coating Surface Preparation Cleaning Solvents So
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Learning Objectives
• Describe metal corrosion and how it can be prevented • List and describe the main ingredients in paint • List and describe the chemicals that can be used to clean metal surfaces prior to painting or coating • Identify the main causes of wood degradation • Describe the treatments and coatings that can be used to protect wood surfaces • Explain how primers and paints for masonry surfaces are unique • Describe common application methods for paints and coatings • {Audio: And} Identify the safety hazards presented by cleaning solvents, acid cleaners, soaps, detergents, and solvent-based and oil-based paints and coatings
Specs
| Course Level | Intermediate |
| Languages | English |
| Compatibility | Audio, Video |
| Based on: | Industry Standards and Best Practices |
Key Questions
What is the purpose of painting a material?
The purpose of applying paint to a material is to extend its useful life by slowing or stopping corrosion.
What is corrosion?
Corrosion is an electrochemical process that converts a refined metal into a more chemically stable and usually less useful form. Iron being converted to rust by water and oxygen is an example of corrosion.
What should happen to metal before it is painted?
Before a surface is painted or coated, it should be properly prepared to ensure that the paint or coating adheres strongly and evenly to the surface. Preparation includes washing, chemical cleaning, sanding, and drying.
What are some alternatives to painting that can be used to prevent corrosion of metal?
In addition to coating metal with paint, metal can be protected by galvanizing, epoxy resin coating and powder coating.
What are some treatments for slowing the degradation of wood?
In addition to paint, copper-based preservatives, preservative oils like tung oil, and creosote, can be used to protect wood.
Sample Video Transcript
Metal corrosion is a serious concern because of its prevalence and cost. Left unchecked, metal corrosion can cause premature equipment failures, which can lead to safety problems, environmental issues, lost production, and increased costs. In industrial economies, like the U.S., the annual cost of metal corrosion can exceed 3% of a country’s Gross National Product (GNP).
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