Adhesion
The ability of dry paint to remain on the surface without blistering, flaking or cracking. Adhesion is probably the single most important property of paint.
Bond
This represents the state of adhesion between the coating and the substrate. Its strength will depend on the details of the spraying process and the materials used. Bonding mechanisms may be mechanical, physical, chemical or metallurgical or a combination of these.
Bond Coat
A coating applied as an intermediary between the main or top coating and the substrate in order to improve the bond strength and/or to provide a corrosion or oxidation barrier.
Bond Strength
The strength of the adhesion between the coating and the substrate. A number of test methods are in use to measure the bond strength of coatings.
Coating
The application of a layer of material onto the surface of a substrate.
Corrosion
1) Gradual chemical or electrochemical attack on a metal by atmosphere, moisture or other agents
2) Chemical attack of furnace linings by gases, slags, ashes or other fluxes occurring in various melting practices.
Cracking
Breaks or splits in the paint's surface.
Degreasing
The removal of grease and oil from a surface. Degreasing by immersion in liquid organic solvents or by solvent vapours condensing on the parts to be cleaned.
Die Coating
A material, e.g. silicone, stearate, oil, or wax for lubricating a die pattern or core box to facilitate easy removal of a casting, mold or core.
Dip Coat
In solid and shell mold investment casting, a fine ceramic coating applied as a slurry to the pattern to produce maximum surface smoothness, followed by a cheaper conventional investment.
Etch
To roughen the surface of a metal by selective dissolution. The solution used for etching is called etch or etchant.
Galvanized
The process of coating steel with zinc for corrosion resistance.
Grit Blasting
Projection of hard metal or oxide grit material used to clean and roughen surfaces prior to coating.
Heat Resistant Coating
Any coating which during normal use must withstand temperatures of at least 204°C (400°F).
Impingement
A process resulting in a continuing succession of impacts between (liquid or solid) particles and a solid surface.
Intergranular Corrosion
Corrosion in a metal taking place preferentially along the grain boundaries.
Internal Oxidation
The formation of isolated particles of corrosion products beneath the surface of the metal or coating. This occurs as a result of preferential oxidation of certain alloy constituents by inward diffusion of oxygen, nitrogen, sulphur...
Low Activation Interior Coating
Any Coating used on interior ships to minimize the activation of pigments on painted surfaces within a radiation environment.
Marine Coating
Any coating, except unsaturated polyester resin (fiberglass) coatings, containing volatile organic materials and applied by any means to ships, boats, and their appurtenances, and to buoys and oil drilling rigs intended for the marine environment.
Mechanical Bonding
Usually represented by mechanical interlocking of the deposited particles with the rough heights on the substrate surface produced during grit blasting.
Metallic Coating
Coating which contains more than 5 grams of metal particles per liter of coating, as applied.
Mold Coating (Mold Facing, Dressing)
1) Coating to prevent surface defects on permanent mold castings and die castings
2) Coating on sand molds to prevent metal penetration and improve metal finish.
Orange Peel
A finish resembling the dimpled appearance of an orange peel.
Paint
A coating including resin, a solvent, additives, pigments and, in some products, a diluent. Paints are generally opaque, and commonly represent the portion of the industry known as "architectural coatings."
Passivation
The process in metal corrosion by which metals become passive.
Passivator
A type of inhibitor which appreciably changes the potential of a metal to a more noble (positive) value.
Passive
The state of a metal surface characterized by low corrosion rates in a potential region that is strongly oxidising for the metal.
Peeling
The detachment or partial detachment of a coating.
Pretreatment Coating
A coating which contains no more than 12 percents solids by weight, and at least 1/2-percent acid by weight, is used to provide surface etching, and is applied directly to metal surfaces to provide corrosion resistance, adhesion, and ease of stripping.
Salt Spray Test
Corrosion test in specified spray used to test protective coatings.
Shrinkage Stress
The residual stress in a coating caused by shrinkage during processing.
Shot Peening
The bombardment of a component surface with steel or ceramic shot. Produces a residual compressive stress in the surface and improves fatigue and stress corrosion performance.
Size Analysis
Analysis of the size of the particles being deposited by spraying processes.
Size distribution
The distribution of sizes within a size analysis. The distribution may be normal or skewed in some way due to the powder manufacturing process.
Spalling
The lifting or detachment of a coating from the substrate.
Spray chamber
A chamber in which the spraying process is carried out. It may merely be an acoustic chamber for plasma spraying or a vacuum chamber for vacuum plasma spraying.
Surface Coating Operations
All operations involving the application of protective, decorative, adhesive or strengthening coating or impregnation to one or more surfaces, or into the interstices of any object or material, by means of spraying, spreading, flowing, brushing, roll coating, pouring, cementing or similar means; and any subsequent draining or drying operations, excluding open-tank operations.
Surface Preparation
Cleaning and roughening the surface to be sprayed, usually by grit blasting. This is to increase the adhesion of the coating to the substrate.
Surface Treatment
General term denoting a treatment involving a modification of the surface: superficial heat treatment, diffusion treatment, conversion coating (consisting of a compound of the surface metal by chemical or electrochemical treatment).
Surfacing
The application of a coating or cladding to a surface to impart a change in its surface behaviour.
Stress-Corrosion Cracking
Spontaneous failure of metals by cracking under combined conditions of corrosion and stress, either residual or applied.
Zinc (Zn)
Thermal spray coatings of zinc or zinc alloys (eg Zn/Al, Zn/Sn) provide galvanic corrosion protection.
Zinc Plating
The electro-deposition of zinc or zinc alloys (eg Zn/Ni, Zn/Sn) to provide galvanic corrosion protection.