Surface Coating Industry Flashcards
These are substances that are products of mixtures of film forming materials, pigments, solvents, and other additives, that are applied to a surface, usually called the “substrate” and then dried, which will yield a thin film that is functional and decorative in sense.
Surface coatings
These are insoluble particulate materials that provide colour, opacity, gloss control, rheological control, and certain functions such as corrosion inhibition or magnetic moment.
Pigments
They act as carriers for surface coatings such as paints, varnishes and adhesives.
Solvents
These are the flavors and spices of a coating. Modern coatings are complex formulas with thickeners, emulsifiers, dispersants, pigments, defoamers, leveling agents, photo stabilizers, curing catalysts and others
Additives
•Chemical formula of Calcium Copper S ilicate
• Also know as “Cuprorivate”
• Known by Romans as “Caeruleum”
• A pigment used by Egyptians
Egyptian blue
the white pigment was discovered that would replace white lead
Titanium dioxide
• Contains carbon
• Modified petroleum products
• Paints and powders
• Require several layers of coating
Organic coatings
• Contains silicates, metals, enamels
• S trong chemical bonds with base metals
• High resistance against environmental changes.
Inorganic coatings
• Composed of epoxy resins and polyamine hardeners
• C ross linking of compounds during curing
Epoxy coatings
• Type of polymer (carbamates)
• Characteristics that can easily be modified (glossiness or
transparency
Polyutherane coatings
• Also known as glass coatings, silica coatings, or hydrophobic
coatings.
• Liquid polymer
• S emi permanent
Ceramic coatings
• Reacts with heat swells or increases volume(insulator)
• C lassified based on the surface
• With hydrates thick layer is soft; release water vapor
Intumescent coatings
SURFACE COATINGS CAN BE DIVIDED INTO TWO:
Architectural coatings
Industry coatings
• Used to cover buildings, furniture and the likes in general
• They are also known as “trade sale coatings”
• Applied to wood, gypsum wall board, or plaster surfaces
Architectural coatings
• Used in materials being manufactured
• Applied to a variety of materials including metals, textiles, rubbers, paper, plastics and woods.
Industrial coatings
• The most used technique for covering metal surfaces in industrial settings
GALVANIZING METHOD
makes use of the electrostatic characteristics of various metals, either as sheet metals or in solution as ions.
The electrochemical coating technique
a widely popular method for extracting metals as well as coating metal surfaces.
The electrodeposition (also called electroplating) surface coating method
is a high temperature process that heats a substrate to high temperatures and vaporizes precursor materials onto the target base metal.
VAPOR DEPOSITION METHOD
Increase the surface’s ability to resist corrosion and improve adhesive qualities,
CONVERSION COATINGS
• Most paints are to some extent are protecting the substrate.
• Hard, anti scratch coating on plastics and other materials;
Protective function
• Which is related to binding
• Primers also encourage subsequent coatings to adhere well and sometimes have anti corrosive properties.
Adhesive function
reduces scratching and improves wear and tear resistance.
Titanium nitride
is a protective film created by the base metal, and certain metals, such as Ti and Al, can develop a shielding oxide coating when anodically polarized by an external electrical source.
Anodizing
Phosphoric acid solutions are either dipped into or sprayed over metal surfaces as part of
the phosphating process
The base metal is immersed in a chromium ion solution during
the chromating process
With this technique, the target surface is cleaned before being submerged in a solution.
Electroless
It is an electrometallurgical method used to coat metals that cannot be coated using standard refining or winning procedures.
Molten salt
An internal direct current force leads to the anode becoming anodically polarized and the base steel being exposed to the released metal ions in the solution.
Refining process
The only distinction between the electrowinning and refining processes is
the inert anode material utilized in the system.
is a widely popular method for extracting metals as well as coating metal surfaces.
Also called electroplating
electrodeposition
makes use of the electrostatic characteristics of various metals, either as sheet metals or in solution as ions.
The electrochemical coating technique
During ______, a hot alkali solution is applied to the steel surface to remove common oils
and debris.
the caustic cleaning process
With a hydrochloric acid solution, the surface rust and scales are eliminated in the ____ process
Pickling
The surface oxides are finally eliminated and shielded from potential threats of additional oxidation during
the fluxing phase.
The most used technique for covering metal surfaces in industrial settings
GALVANIZING METHOD
