Vocabulary Flashcards
Passivation
Occurs when the byproducts of corrosion prevent future corrosion.
Corrosion
Environmentally caused deterioration
Corrosion Cell
Anode Cathode Electrolyte Return Path
Anode
The part of a metal that corrodes. The Anode loses positive ions through the electrolyte, and electrons through the return path
Cathode
The cathode consumes electrons and emits ions. The cathode is less active than the anode.
Return path
Allows the flow of electrons to the cathode
Electrolyte
Allows the movement of ions between the anode and the cathode
Mill scale
Iron oxide scaling on new steel surfaces. Cathodic - must be removed.
Galvanic series
Ranking of metals from least active (bottom) to most active (top). Nobler metals such as platinum, are at the bottom, while more active metals such as magnesium and zinc, are at the top.
Corrosion inhibitor
Added to the environment to inhibit corrosion. Usually added to the electrolyte.
Cathodic Protection
Uses sacrificial anodes or an impressed current to protect a surface from corrosion.
Alkaline Cleaners
Saponify most oils and greases, and surface-active components wash away other contaminants.
Ceramic Grit
Relatively expensive abrasives with sharp cutting edges. Good for hard base msterials.
Crushed Slag
Relatively cheap abrasives created by metallurgical processes. Copper, nickel, coal and aluminum slag are common,
Detergents
Soaps for washing a surface.
Dry grit blasting (Air Blasting)
Blasting that uses a highly concentrated stream of grit. Creates a rough surface profile
Emulsion cleaners
Soapy spray that cleans the surface
Sleeve Test
Used to determine if there is an unacceptable amount of soluble salts on a surface
ISO Comparators
Visual tools for evaluating surface profile. Cards that work like color match tiles.
Chlorides
hydrochloric acid HCI salts.
nitrates
Nitric Acid salts
Sulfates
Sulfuric Acid salts.
Barrier Coating
A coating that
Prevents contact with environment
Highly resistant to liquids or gasses
used to protect an existing coating
Binder
nonvolatile portion of the vehicle of a coating material
Inorganic coatings
coatoings whose binders are inorganic, most commonly based on silicone or zinc
Organic coatings
based on petroleum products, or other living agents
Inhibitive pigment
passivates the metal surface by forming a thin, tightly adherent film. Reinforces and plugs defects in the air-formed film
Solvents
added to coatings to liquify the binder
Curing
The process where the coating becomes protective over time
Acrylic
A type of resin that is polymerized from acrylic acid, or:
methacrylic acid
Alkyd
(Oil based coatings)
a type of resin that is formed by the reaction of:
polyhydric alcohols and
polybasic acids
part of which is derived from oils or fats
Convertible Coatings
coatings that cure from one of several polymerization methods, even when solvent evaporation is involved
Epoxy
A type of resin
formed by a reaction of
epi-chloro-hydrin
and
polyols
formed by the reaction of aliphatic or aromatic polyols with epichlorohyrdin.
Chlorinated Rubber
one of the earliest protective coatings
Furan
a type of resin formed by the reaction of the polymerization of furfuryl, furfuryl alcohol or other furfuylic compounds
Latex Emulsions
coatings that can contain a number of different resin particles,
that are covered by an emulsifier to keep them apart in the liquid stage
Nonconvertible coatings
Coatings that cure by solvent evaporation
no chemical change to the resins as they tranform from liquid to solid state
Phenol
organic chemical used in a wide array of manufactured items
Thermosetting
Permanently hardening or solidifying on being heated.
a coating that is formed as a result of a chemical cross-linking reaction, such as polymerization or heat or an additive reaction
thermoplastic
A material capable of being repeatedly softened by heat and hardened by cooling
Psychrometric tables
used after the psychrometer readings are obtained
come from the US Department of Commerce Weather Bureau
determine the relative humidity and dew point
psychrometric chart
is a graph of psychrometric data
graphs the physical properties of air moisture
List 5 of the formal sections usually found in a good specification
scope of work
terms and definitions
refrence safety and codes
surface preparation expectations
coating materials
documentation and reporting
ASTM Cups
Standard laboratory cups for testing viscosity
Alkyd Resins
resins prepared by reacting alcohols and acids
Curing
Setting up, hardening
Potassium ferricynide
Used to test for water soluble forrous salts.
Types of soluble salt contamination includes:
Chloride contamination
Sulfate contamination
Nitrate Contamination
