AMPP CCI-1 flashcards
AMPP CCI-1 · 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.
- Corrosion cell components
- An electrochemical corrosion cell requires an anode, a cathode, an electrolyte path, and an electron path. Removing or blocking any one component stops the corrosion reaction.
- Galvanic corrosion
- When two dissimilar metals contact in an electrolyte, the more active metal becomes anodic and corrodes preferentially, driven by the potential difference between the two metals.
- Barrier protection
- A coating mechanism that physically separates the substrate from water, oxygen, and ions. Performance depends on film permeability, thickness, and freedom from defects.
- Osmotic blistering
- Soluble salts or contaminants beneath a coating create a concentration gradient that draws water through the film by osmosis, forming blisters and lifting the coating.
- Cathodic disbondment
- Hydroxyl ions generated at a cathodically protected steel surface raise local pH, breaking coating adhesion and spreading disbondment outward from defects.
- Coating service life formula
- Service life L equals a constant k divided by the number of coating defects m per unit area. Fewer breaks and holidays produce proportionally longer coating life.
- Inhibitive coating mechanism
- The coating releases or contains pigments that passivate the substrate or slow the anodic or cathodic reaction, supplementing the barrier effect of the film.
- Adhesion mechanisms
- Coatings bond by mechanical interlock into a roughened profile, chemical bonding at reactive sites, and secondary van der Waals forces across the interface.
- White metal blast
- NACE No. 1/SSPC-SP 5 preparation leaves the surface free of all visible oil, grease, dirt, mill scale, rust, and coating, with a uniform gray-white finish.
- Near-white blast
- NACE No. 2/SSPC-SP 10 permits only slight staining on no more than 5 percent of each unit area, with no more than 5 percent of defects.
- Commercial blast
- NACE No. 3/SSPC-SP 6 permits staining on up to 33 percent of each unit area, and the surface must be free of all visible oil and grease.
- Anchor profile measurement
- Surface profile is measured by replica tape (coarse grade for 20-50 micrometres, extra-coarse for 38-115 micrometres) or by a stylus profilometer.
- Bresle patch method
- A patch is sealed to the surface, a known volume of test solution is injected and extracted, and conductivity is measured to estimate soluble salt contamination per ISO 8502.
- Dew point rule
- Steel temperature must be at least 3 degrees Celsius above the dew point during surface preparation and coating application to prevent condensation on the substrate.
- Abrasive cleanliness
- Abrasives must be free of salts, oil, and dust per ISO 11124/11126 and SSPC-AB standards; contaminated abrasive transfers contamination to the prepared surface.
- Waterjetting standards
- SSPC-SP 12/NACE No. 5 defines waterjetting preparation levels, and ISO 8501-4 grades flash rust as light, moderate, or heavy after waterjetting.
- Wet film thickness formula
- WFT equals DFT divided by the volume solids fraction. For 100 micrometres DFT at 60 percent volume solids, WFT is about 167 micrometres.
- Theoretical coverage
- Coverage in square metres per litre equals 10 times percent volume solids divided by DFT in micrometres, before adjusting for transfer efficiency losses.
- Holiday detection methods
- Low-voltage wet-sponge testing detects pinholes in thin films; high-voltage spark testing detects holidays in thicker films per NACE SP0188 and SP0274.
- Stripe coat
- A brush-applied coat on edges, welds, and back-to-back members before full coating, building film thickness where spray application is difficult.
- Recoat window
- The manufacturer-specified time interval during which the next coat bonds properly; exceeding it may require surface roughening to restore intercoat adhesion.
- 80/20 DFT rule
- Per SSPC-PA 2, no single DFT reading may fall below 80 percent of specification, and the average of all readings must meet or exceed specification.
- Pull-off adhesion test
- ASTM D4541 or ISO 4624 applies a tensile load to a dolly bonded to the coating; results are reported as a value and a failure mode.
- Environmental readings
- Air temperature, steel temperature, relative humidity, and dew point are recorded at each application interval per ISO 8502-4 to verify specification compliance.
- ISO 12944 corrosivity
- Corrosivity categories C1 through C5 and CX classify environments by mass loss of standard specimens; durability ranges are low, medium, high, and very high.
- SSPC-PA 2 scope
- SSPC-PA 2 governs dry film thickness measurement by magnetic gauges on steel, defining the 80/20 rule and required readings per 10 square metres.
- Safety data sheet
- Per OSHA 1910.1200, the SDS provides hazard identification, composition, first-aid, handling, PPE, and disposal information for coatings and solvents.
- Confined space entry
- OSHA 1910.146 requires atmospheric testing for oxygen, flammables, and toxics, plus a permit, attendant, and rescue plan before entry.
- Blasting respiratory protection
- OSHA 1910.94 requires Type CE supplied-air respirators for abrasive blasting, along with hearing and eye protection during blasting operations.
- Cross-cut adhesion
- ASTM D3359 or ISO 2409 cuts a lattice pattern into the film and applies tape; results are ranked by the amount of coating removed.
- Nonconformance report
- An NCR documents a deviation from specification, its root cause, the corrective action taken, and the disposition, and is retained in the project record.
- Hold point versus witness point
- A hold point requires inspector sign-off before work continues; a witness point is observed when scheduled but does not stop the work if missed.