SURFACE TREATMENT Flashcards
(30 cards)
Involves modifying the
exterior of materials to enhance their properties such
as durability, appearance, and resistance to
corrosion or wear.
Surface Treatment
This can include cleaning, coating,
and chemical conversion processes.
Surface Treatment
removing contaminants (dirt, grease,
rust) from surfaces.
Cleaning
- Methods: Mechanical (abrasive blasting),
chemical (solvents), electrolytic (electric
current), and ultrasonic (sound waves).
Cleaning
Prepares surfaces for coating,
paint, or further treatment, and removes rust or
oxidation.
Cleaning
Technique of Cleaning by mechanical means
Burnishing
Technique of cleaning by electrochemical processes
Electrolytic
Applying a protective or decorative
layer on a surface to enhance its properties.
Coating
Type of Coating:
For aesthetic and protection.
Paint coating
Type of Coating:
Galvanizing (zinc), chrome, or nickel plating for corrosion resistance.
Metallic Coating
Type of Coating:
For chemical resistance (e.g., Teflon).
Polymer Coating
Type of Coating:
For heat and wear resistance.
Ceramic Coating
Type of Coating:
A process to thicken the oxide layer on aluminum
Anodizing
Applications: Protection against
corrosion, wear resistance, and improving appearance.
Coating
Coating Technique:
Commonly used for applying epoxy, polyurethane, and polyurea coatings on floors, walls, and structural steel
Spray application
Advantages:
A solid-state process which results in man unique coating characteristics
Disadvantages:
Loss of Ductility of coating during plastic deformation process
Spray Application
Types of Spray Application
- Universal Spray paint
- Spray Gun
- Cordless Sprayer
Coating Technique;
Provides good coverage and is often used for applying epoxy coatings on walls and ceilings
Roller Application
Coating Technique;
Advantages:
Resource Saving and Efficient
Large Surface Covering
Disadvantages:
Messy
Slower than a sprayer
Can be used for smaller surfaces
Roller Application
Coating Technique:
Allows for precise control over coating thickness and is commonly used for touch-up work, small areas, or detailed applications where spray or roller methods are impractical.
Brush Application
Advantages:
Smooth, even coat, reaching flat surfaces, corners, and gaps effectively. The paint film is thick, with good quality and minimal water absorption.
Disadvantages;
Costly (by 10%), if there is a bump, the color difference of the repair will be more obvious than the roller coating
Brush Application
Coating Technique;
The substrate is immersed in a tank of liquid coating material, ensuring complete coverage. It’s commonly used for coating small, complex-shaped parts or components such as fasteners, springs, and automotive parts.
Dip Coating
Advantages:
can protect against corrosion and wear, and can improve the appearance, electrical conductivity, and chemical resistance of metals.
Disadvantages:
Coatings can be less cost-effective in the long run, and can require maintenance, touch-ups, or reapplication.
Dip Coating
- Using chemical reactions
to alter surface properties for improved corrosion resistance, hardness, or adhesion.
Chemical Conversions
