AMPP Marine Coatings flashcards
AMPP Marine Coatings · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Sa 2½ blast grade
- Near-white blast cleaning per ISO 8501-1; only slight staining is allowed, with no visible oil, grease, dirt, mill scale, rust, or old coating.
- Sa 3 blast grade
- White metal blast cleaning per ISO 8501-1; the surface is free of all visible contamination and staining, used for the most demanding marine systems.
- Surface profile
- The roughness of a prepared steel surface, commonly assessed with ISO 8503 comparators or replica tape, and specified to give the coating mechanical key.
- Dew point rule
- Steel temperature must be at least 3 °C above the dew point during preparation and application to prevent condensation forming on the surface.
- Bresle method
- A soluble salt test where a patch is applied to the surface, distilled water injected, and the extracted solution measured for conductivity to estimate chloride.
- Stripe coating
- A brush-applied coat on edges, welds, and corners before full spray application, ensuring minimum film thickness on difficult geometry.
- Pot life
- The usable time after mixing a two-component coating during which it can still be applied before viscosity rises and application defects occur.
- Recoat window
- The manufacturer-specified interval between coats; exceeding the maximum may require abrading the surface to restore intercoat adhesion.
- Volume solids
- The fraction of a coating that remains as dry film after solvent evaporates; used to convert wet film thickness to dry film thickness.
- DFT from WFT
- Dry film thickness equals wet film thickness multiplied by the volume solids fraction expressed as a decimal, e.g. 200 µm WFT × 0.60 = 120 µm DFT.
- Zinc-rich primer
- A primer with high metallic zinc content that provides cathodic protection to steel, commonly used in marine immersion and atmospheric systems.
- Amine blush
- A surface film formed when epoxy cures in high humidity or low temperature; it can impair intercoat adhesion and must be removed before recoating.
- Magnetic DFT gauge
- An instrument measuring dry film thickness on steel using magnetic or electromagnetic principles; readings are averaged per ISO 19840 or SSPC-PA 2.
- Roughness correction
- An adjustment applied to DFT readings on blasted steel per ISO 19840 because the profile causes the gauge to overstate the true film thickness.
- Holiday test
- A test detecting pinholes and discontinuities; a low-voltage wet sponge is used for thin films and high-voltage spark testing for thicker coatings.
- Pull-off adhesion test
- A destructive test per ISO 4624 where a dolly is bonded to the coating and pulled to measure adhesion strength; the test area must be repaired.
- Cross-cut adhesion test
- A test per ISO 2409 where a lattice pattern is cut into the coating and tape applied to assess adhesion by the amount of coating removed.
- ISO 4628 defects
- A series of standards classifying coating defects such as blistering, rusting, cracking, and flaking by quantity and size for consistent visual assessment.
- Hold point
- A stage in the inspection plan where work cannot proceed until the inspector has verified and signed off on the preceding step.
- Witness point
- A stage where the inspector must be notified and may attend, but work can proceed if the inspector does not appear.
- Nonconformance report
- A document recording a deviation from specification, including location, measured value, spec limit, and the agreed disposition.
- Pre-job meeting
- A meeting before work begins to confirm the specification, inspection plan, hold points, responsibilities, and acceptance criteria among all parties.
- Coating system
- A specified sequence of coats, typically primer, intermediate, and topcoat, each with defined product and dry film thickness.
- Inspection plan
- A document defining what will be inspected, how, at which stages, and the acceptance criteria, aligned with the project specification.
- Abrasive cleanliness
- The requirement that blasting abrasive be free of contaminants such as salts and oil, covered by ISO 11124 and ISO 11126, to prevent embedding contamination.
- Weld spatter removal
- Removal of weld spatter and grinding of sharp edges before blasting, because irregular geometry causes thin films and early coating failure.
- Airless spray parameters
- Tip size, fan angle, and pressure settings that control film build and finish; incorrect settings cause thin films, runs, or overspray.
- Induction time
- The waiting period after mixing a two-component coating before application, allowing chemical reaction to begin as specified by the manufacturer.
- Polyurethane topcoat
- A topcoat binder offering good gloss and color retention and UV resistance, commonly used as the finish coat in atmospheric marine systems.
- Environmental monitoring
- Recording ambient temperature, steel temperature, relative humidity, and dew point at each application and inspection stage using calibrated instruments.
- Calibration traceability
- The requirement that inspection instruments be calibrated against traceable standards, with records kept as part of QC documentation.
- Acceptance criteria
- The numeric limits in the specification, such as DFT range, adhesion value, or holiday count, against which inspection results are judged.