AMPP PCS flashcards
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32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Volume Solids
- The percentage of a coating that remains as dry film after solvents evaporate. It determines coverage rate and the wet film thickness needed to achieve a specified dry film thickness.
- Wet Film Thickness
- The thickness of a coating measured immediately after application while still wet. It is calculated as target dry film thickness divided by the volume solids fraction.
- Dry Film Thickness
- The thickness of the cured coating film measured after solvent evaporation and cure. It is the value compared against specification requirements and is measured with magnetic or eddy-current gauges.
- Zinc-Rich Primer
- A primer with high metallic zinc content that protects steel by sacrificial galvanic action. Zinc corrodes preferentially, shielding the underlying steel from oxidation even where the film is damaged.
- Barrier Protection
- A coating mechanism in which the cured film blocks water, oxygen, and ions from reaching the substrate. Epoxies and high-build films rely primarily on this mechanism.
- Inhibitive Pigment
- A pigment that releases corrosion-inhibiting ions at the coating-metal interface to slow anodic or cathodic reactions. Examples include phosphate and chromate pigments in primer formulations.
- Critical PVC
- The pigment volume concentration at which binder just fills the voids between pigment particles. Above this level the film becomes porous and loses barrier and adhesion performance.
- Pot Life
- The usable working time after mixing a multi-component coating. Material used beyond pot life may cure poorly, lose adhesion, or fail to develop specified properties.
- Dew Point
- The temperature at which moisture in the air condenses on a surface. Substrate temperature must stay above dew point during application and cure to prevent condensation and adhesion failure.
- Induction Time
- The waiting period after mixing some epoxy or zinc-rich coatings before application, allowing chemical components to react. It is specified by the manufacturer and differs from pot life.
- Recoat Window
- The time interval after application during which the next coat may be applied without surface preparation. Exceeding it may require abrading or solvent wiping to restore adhesion.
- Aliphatic Polyurethane
- A topcoat resin that resists UV degradation and retains gloss and color on exterior exposures. It is used over epoxy intermediate coats where color and gloss retention are required.
- Abrasive Blast Profile
- The surface roughness created by abrasive blasting, measured in mils or micrometers. It must fall within the range specified by the coating manufacturer for adequate mechanical adhesion.
- Soluble Salts
- Contaminants such as chlorides and sulfates left on a substrate that draw moisture and cause osmotic blistering or underfilm corrosion. They are measured by conductivity testing and must be removed.
- Holiday
- A discontinuity, pinhole, or thin spot in a coating film that exposes the substrate. It is detected by low-voltage wet-sponge or high-voltage spark testing depending on film thickness.
- SSPC-SP 5
- The white metal blast cleaning standard, equivalent to NACE No. 1. It requires removal of all visible oil, grease, dirt, mill scale, rust, and coating, leaving a uniform gray-white surface.
- SSPC-SP 10
- The near-white blast cleaning standard, equivalent to NACE No. 2. It permits staining on no more than five percent of each unit area and is common for high-performance coating systems.
- SSPC-SP 6
- The commercial blast cleaning standard, equivalent to NACE No. 3. It allows staining and some tightly adherent residues on roughly one-third of each unit area.
- Replica Tape
- A compressible tape pressed against a blasted surface to capture its profile. The compressed tape is measured with a micrometer to determine surface roughness in mils.
- Bresle Test
- A method for sampling soluble salts on a surface using a patch and extraction solution. Conductivity of the extract is measured to quantify contamination against a specification limit.
- Magnetic Pull-Off Gauge
- A dry film thickness instrument that measures the force required to pull a magnet from the steel. It is used on ferrous substrates and requires calibration verification before use.
- Eddy-Current Gauge
- A non-destructive instrument for measuring coating thickness on non-ferrous substrates such as aluminum. It uses electromagnetic induction principles rather than magnetic attraction.
- Calibration Verification
- A check of a DFT gauge against certified foils or a known standard. It confirms gauge accuracy and is performed before and after each inspection series.
- Pull-Off Adhesion Test
- A test in which a dolly is bonded to the coating and pulled normal to the surface. The failure stress and failure mode (adhesive or cohesive) are recorded per ASTM D4541.
- Cohesive Failure
- A failure mode in which the coating separates within itself rather than at the substrate interface. It indicates the coating's internal strength was exceeded before its bond to the substrate.
- Adhesive Failure
- A failure mode in which the coating separates cleanly from the substrate or from a previous coat. It points to inadequate surface preparation or intercoat contamination.
- Hold Point
- A stage in the work sequence where the inspector must verify and sign off before the contractor proceeds. Examples include post-blast inspection and pre-topcoat verification.
- Relative Humidity
- The percentage of moisture in the air relative to saturation at a given temperature. It is recorded with temperature and dew point to confirm compliance with the product data sheet.
- Surface Comparator
- A reference standard with known roughness grades used to visually estimate blast profile. It is a qualitative check and is often confirmed with replica tape measurement.
- High-Voltage Holiday Test
- A continuity test using a spark tester at a specified voltage to detect discontinuities in thick films. Voltage is set according to film thickness and the specification.
- Wet-Sponge Test
- A low-voltage continuity test using a moistened sponge to detect holidays in thin films. It is appropriate for films too thin for high-voltage spark testing.
- Inspection Report
- A record documenting environmental readings, surface preparation, materials, and measured film thickness at each hold point. It provides traceability and evidence of specification compliance.