SSPC Fundementals of Protective Coatings Questions and Answers 100% Solved correctly

sacrificial coatings are always used as (primers or top coats) - Answer-primers Galvanizing is better than metallizing because - Answer-it creates an intermetallic layer 3 mechanisms of corrosion control by coatings: - Answer-Barrier protection Chemical inhibitors Cathodic (galvanic) protection Regarding the mechanisms of corrosion control, explain the chemical inhibitors: - Answer-It controls the anodic reaction within the metal. Mechanism is not always clear. General the inhibitors react or bind with water so it does not penetrate further. Chemical inhibitors are only suitable for primer. What are the desired film properties? - Answer-Good adhesion Low permeability Continuous film Flexibility Abrasion resistance Weathering resistance Resistance to water, fuel, and chemicals Resistance to biological growth What are the tests for coating adhesion? - Answer-Tape test (ASTM D3359) Knife test (ASTM D6677) Pull-off test for coatings on steel (ASTM D4541)Pull-off test for coatings on concrete (ASTM D7234) What test do you use to measure permeability? - Answer-ASTM D1653 (measures water vapor transmission of organic coating films) Name the 5 main hardness tests - Answer-ASTM D3363 (pencil test for coatings) ASTM D2583 (Barcol impressor) ASTM D2240 (durometer) *thick rubber and plastic films ASTM D2134 (sward type hardness rocker) *for organic coatings ASTM D1474 (indentation hardness) *organic coatings What is the test to measure flexibility? - Answer-ASTM D522 (Mandrel bend test) What are the two tests for measuring abrasion resistance? - Answer-ASTM D4060 (Taber Abraser) ASTM D968 (Falling Test) Name the 5 weathering tests - Answer-ASTM B117 (salt fog cabinet) ASTM D5894 (alternating exposures in a fog /dry cabinet and a UV/condensation cabinet) ASTM G85 (fog testing) ASTM D4587 (fluorescent UV-condensation exposure) ASTM D2247 (humidity cabinet) What are the 3 basic components of coatings? - Answer-1. Solvent (evaporates into air) 2. Binder or Resin (Vehicle, considered solid)3. Pigment (solids in the film) What are 4 functions of a solvent? - Answer-Dissolve binder Reduce viscosity Control drying of wet film Control adhesion and durability of dry film What is a binder? - Answer-It is the film forming component of the coatings What are the coating properties imparted by pigments? - Answer-Opacity (hides underlying surface) Color Corrosion resistance Wet paint properties Weather and moisture resistance Level of gloss (more pigment = less gloss) Reinforcement