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WTAP > SURFACE TREATMENT > Flashcards

SURFACE TREATMENT Flashcards

1
Q

Involves modifying the
exterior of materials to enhance their properties such
as durability, appearance, and resistance to
corrosion or wear.

A

Surface Treatment

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2
Q

This can include cleaning, coating,
and chemical conversion processes.

A

Surface Treatment

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3
Q

removing contaminants (dirt, grease,
rust) from surfaces.

A

Cleaning

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4
Q
  • Methods: Mechanical (abrasive blasting),
    chemical (solvents), electrolytic (electric
    current), and ultrasonic (sound waves).
A

Cleaning

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5
Q

Prepares surfaces for coating,
paint, or further treatment, and removes rust or
oxidation.

A

Cleaning

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6
Q

Technique of Cleaning by mechanical means

A

Burnishing

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7
Q

Technique of cleaning by electrochemical processes

A

Electrolytic

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8
Q

Applying a protective or decorative
layer on a surface to enhance its properties.

A

Coating

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9
Q

Type of Coating:
For aesthetic and protection.

A

Paint coating

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10
Q

Type of Coating:
Galvanizing (zinc), chrome, or nickel plating for corrosion resistance.

A

Metallic Coating

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11
Q

Type of Coating:
For chemical resistance (e.g., Teflon).

A

Polymer Coating

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12
Q

Type of Coating:
For heat and wear resistance.

A

Ceramic Coating

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13
Q

Type of Coating:
A process to thicken the oxide layer on aluminum

A

Anodizing

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14
Q

Applications: Protection against
corrosion, wear resistance, and improving appearance.

A

Coating

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15
Q

Coating Technique:
Commonly used for applying epoxy, polyurethane, and polyurea coatings on floors, walls, and structural steel

A

Spray application

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16
Q

Advantages:
A solid-state process which results in man unique coating characteristics
Disadvantages:
Loss of Ductility of coating during plastic deformation process

A

Spray Application

17
Q

Types of Spray Application

A
  • Universal Spray paint
  • Spray Gun
  • Cordless Sprayer
18
Q

Coating Technique;
Provides good coverage and is often used for applying epoxy coatings on walls and ceilings

A

Roller Application

19
Q

Coating Technique;
Advantages:
Resource Saving and Efficient
Large Surface Covering
Disadvantages:
Messy
Slower than a sprayer
Can be used for smaller surfaces

A

Roller Application

20
Q

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.

A

Brush Application

21
Q

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

A

Brush Application

22
Q

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.

A

Dip Coating

23
Q

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.

A

Dip Coating

24
Q
  • Using chemical reactions
    to alter surface properties for improved corrosion resistance, hardness, or adhesion.
A

Chemical Conversions

25
Q

Method of Chemical Conversion:
Enhances aluminum’s corrosion
resistance. (applicable to non ferrous metals

an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide

A

Anodizing

26
Q

Method of Chemical Conversion: Creates a phosphate coating
for steel, improving corrosion resistance.

Provides a more uniform coating compared to chromate conversion coatings.

A

Phosphating

27
Q

Method of Chemical Conversion:
For corrosion resistance on metals like aluminum and other lightweight metals. Also called chem film

enables the metal to react with the oxide layer and form a passivated metal chromate on the surface. Results in a thin layer of hexavalent chromium or trivalent chromium.

A

Chromate Conversion

28
Q

Method of Chemical Conversion:
Improves corrosion resistance in stainless steal

A

Passivation

29
Q

Method of Chemical Conversion:
Depositing a thin layer of metal for enhanced properties

A

Electroplating

30
Q

Applications of this surface treatment: Improving corrosion resistance, adhesion for coatings, and enhancing surface hardness.

A

Chemical Conversion

WTAP (5 decks)

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