Coatings - Correct Answer - a liquid, liquifiable, or mastic composition after application to a surface is
converted into a solid, protective decorative or functional adherent film.
4 Reasons for Coating - Correct Answer - 1. aesthetics
2. Performance Requirements
3. Safety Identification
4. Corrosion Prevention and Control
Aesthetics - Correct Answer - 1st impression
Attract
Impression of cleanliness increase appeal
Performance Requirements 15 - Correct Answer - chemical resistance
Water resistance
Ease of application
Adhesion to substrate
Cohesive Strength
Flexibility and Elongation
Impact Resistance
Biocides
Decontamination
Abrasion Resistance
, Temperature Resistance
Marine Fouling
Weatherproofing
Luminescence
Passive Fire Protection
Safety Identification - Correct Answer - coatings enhance safety of an environment.
Markings...walkways pipe identification
Corrosion Prevention and Control CPC - Correct Answer - most common corrosion prevention systems
Corrosion - Correct Answer - the deterioration of a metal due to a chemical reaction in the environment
Corrosion Process 4 steps - Correct Answer - 1. Metal Present
2. Metal reacts physically and chemically with its environment. Needs Water and O
3. Transformation- Metal into other chemical compounds need ACME
4. Degradation of Metal back to natural state
Anode - Correct Answer - metal surface corrodes; it Oxidizes (gains )) Causing mass lose and dissolves
into electrolyte
Dissolved metal Positively charged CATIONS then migrate to Cathode through the electrolyte
Oxidation - Correct Answer - A chemical change in which a substance combines with oxygen, as when
iron oxidizes, forming rust
at anode where metal loses electrons
Cathode - Correct Answer - is the area of metal surface that reduces (loses Oxygen)
does not corrode and is protected
forms Negatively charged ANIONS that migrate to the anode through electrolyte
Reduction - Correct Answer - a chemical reaction in which a molecule gains electrons and energy
Metallic Pathway - Correct Answer - Connect Anode and Cathode and allows passage of electrons
generated at Anode to cathode. Often the underlying metal substrate
Electrolyte - Correct Answer - Conductive medium in which ions are carried from Anode to Cathode
any solution capable of conducting electricity Wate
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