Definitions Flashcards
The coating must resist breakdown from the chemicals to which it is exposed. This is a primary function of the resin used.
Chemical Resistance
Water affects virtually all coatings. Greater resistance equates to more effective corrosion control.
Water Resistance
A vital characteristic, especially to intricate structural details. The more difficult the application, the more opportunity for defects to be created, leading to coating failure.
Ease of Application.
Based on physical and chemical interactions between the coating and the substrate. Poor performance equates to?
Adhesion to substrate
Coatings but be able to withstand the stresses of the curing process and changes in temperature and moisture content.
Cohesive Strength
The ability to expand and contract with the substrate is critical in some coating applications.
Flexibility and Elongation.
The coating may have to resist impact loads.
Impact Resistance
Coating in some areas may have to be abrasion?
Abrasion resistant.
The environment may expose the coating to extremes of temperature, usually elevated.
Temperature resistance.
A key variable in barrier coatings and when using coatings in conjunction with cathodic protection.
Dielectric Strength.
Components of a coating, typically added in small amounts to perform a specific function.
Additives
The process by which dissimilar molecules cling together due to attractive forces.
Adhesion
Adhesion can be?
Chemical, mechanical, polar or a combination of all three.
A coating that (1) has a high resistance to permeation of liquids and/or gases or (2) is applied over a previously coated surface to prevent damage to the underlying coating.
Barrier Coatings
The nonvolatile portion of the vehicle of a formulated coating material.
Binder
Coatings whos binders are made from non-living things. Most commonly based on Zinc or Silicone.
Inorganic Coatings
A pigment that passivates the metal surface by forming a thin, tightly adherent film or by reinforcing and plugging defects in the natural air formed film?
Inhibitive Pigment
Coatings whos binders are made from living, or once living, things.
Organic coatings
The file, solid particles added during manufacture of a coating which are substantially insoluble in the vehicle. Used to Impart color, corrosion control, or decorative properties?
Pigments
Used to Impart color, corrosion control, or decorative properties?
Pigments
Coatings that use a metal that is anodic to steel and corrodes preferentially.
Sacrificial coatings.
Essentially, sacrificial coatings are a form of ___ ___, especially in the vicinity of film defects.
Cathodic Protection.
Added to coatings to liquefy the binder and allow for application in a productive manner.
Solvents.
