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Coatings And Corrosion Prevention > Vocabulary > Flashcards

Vocabulary Flashcards

1
Q

Passivation

A

Occurs when the byproducts of corrosion prevent future corrosion.

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2
Q

Corrosion

A

Environmentally caused deterioration

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3
Q

Corrosion Cell

A

Anode Cathode Electrolyte Return Path

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4
Q

Anode

A

The part of a metal that corrodes. The Anode loses positive ions through the electrolyte, and electrons through the return path

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5
Q

Cathode

A

The cathode consumes electrons and emits ions. The cathode is less active than the anode.

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6
Q

Return path

A

Allows the flow of electrons to the cathode

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7
Q

Electrolyte

A

Allows the movement of ions between the anode and the cathode

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8
Q

Mill scale

A

Iron oxide scaling on new steel surfaces. Cathodic - must be removed.

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9
Q

Galvanic series

A

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.

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10
Q

Corrosion inhibitor

A

Added to the environment to inhibit corrosion. Usually added to the electrolyte.

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11
Q

Cathodic Protection

A

Uses sacrificial anodes or an impressed current to protect a surface from corrosion.

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12
Q

Alkaline Cleaners

A

Saponify most oils and greases, and surface-active components wash away other contaminants.

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13
Q

Ceramic Grit

A

Relatively expensive abrasives with sharp cutting edges. Good for hard base msterials.

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14
Q

Crushed Slag

A

Relatively cheap abrasives created by metallurgical processes. Copper, nickel, coal and aluminum slag are common,

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15
Q

Detergents

A

Soaps for washing a surface.

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16
Q

Dry grit blasting (Air Blasting)

A

Blasting that uses a highly concentrated stream of grit. Creates a rough surface profile

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17
Q

Emulsion cleaners

A

Soapy spray that cleans the surface

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18
Q

Sleeve Test

A

Used to determine if there is an unacceptable amount of soluble salts on a surface

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19
Q

ISO Comparators

A

Visual tools for evaluating surface profile. Cards that work like color match tiles.

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20
Q

Chlorides

A

hydrochloric acid HCI salts.

21
Q

nitrates

A

Nitric Acid salts

22
Q

Sulfates

A

Sulfuric Acid salts.

23
Q

Barrier Coating

A

A coating that

Prevents contact with environment

Highly resistant to liquids or gasses

used to protect an existing coating

24
Q

Binder

A

nonvolatile portion of the vehicle of a coating material

25
Q

Inorganic coatings

A

coatoings whose binders are inorganic, most commonly based on silicone or zinc

26
Q

Organic coatings

A

based on petroleum products, or other living agents

27
Q

Inhibitive pigment

A

passivates the metal surface by forming a thin, tightly adherent film. Reinforces and plugs defects in the air-formed film

28
Q

Solvents

A

added to coatings to liquify the binder

29
Q

Curing

A

The process where the coating becomes protective over time

30
Q

Acrylic

A

A type of resin that is polymerized from acrylic acid, or:

methacrylic acid

31
Q

Alkyd

A

(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

32
Q

Convertible Coatings

A

coatings that cure from one of several polymerization methods, even when solvent evaporation is involved

33
Q

Epoxy

A

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.

34
Q

Chlorinated Rubber

A

one of the earliest protective coatings

35
Q

Furan

A

a type of resin formed by the reaction of the polymerization of furfuryl, furfuryl alcohol or other furfuylic compounds

36
Q

Latex Emulsions

A

coatings that can contain a number of different resin particles,

that are covered by an emulsifier to keep them apart in the liquid stage

37
Q

Nonconvertible coatings

A

Coatings that cure by solvent evaporation

no chemical change to the resins as they tranform from liquid to solid state

38
Q

Phenol

A

organic chemical used in a wide array of manufactured items

39
Q

Thermosetting

A

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

40
Q

thermoplastic

A

A material capable of being repeatedly softened by heat and hardened by cooling

41
Q

Psychrometric tables

A

used after the psychrometer readings are obtained

come from the US Department of Commerce Weather Bureau

determine the relative humidity and dew point

42
Q

psychrometric chart

A

is a graph of psychrometric data

graphs the physical properties of air moisture

43
Q

List 5 of the formal sections usually found in a good specification

A

scope of work

terms and definitions

refrence safety and codes

surface preparation expectations

coating materials

documentation and reporting

44
Q

ASTM Cups

A

Standard laboratory cups for testing viscosity

45
Q

Alkyd Resins

A

resins prepared by reacting alcohols and acids

46
Q

Curing

A

Setting up, hardening

47
Q

Potassium ferricynide

A

Used to test for water soluble forrous salts.

48
Q

Types of soluble salt contamination includes:

A

Chloride contamination

Sulfate contamination

Nitrate Contamination

49
Q
A

Coatings And Corrosion Prevention (2 decks)

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