Coatings ✔- 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 ✔- 1. aesthetics
2. Performance Requirements
3. Safety Identification
4. Corrosion Prevention and Control
Aesthetics ✔- 1st impression
Attract
Impression of cleanliness increase appeal
Performance Requirements 15 ✔- 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 ✔- coatings enhance safety of an environment.
Markings...walkways pipe identification
Corrosion Prevention and Control CPC ✔- most common corrosion prevention
systems
Corrosion ✔- the deterioration of a metal due to a chemical reaction in the
environment
Corrosion Process 4 steps ✔- 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 ✔- 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 ✔- A chemical change in which a substance combines with oxygen,
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