Teach Teach - - in in The Corrosion The Corrosion Understanding the corrosion Understanding the corrosion environment environment
TeachTeach--ininThe CorrosionThe Corrosion
Understanding the corrosion Understanding the corrosion environmentenvironment
CouponsCouponsOnline MonitorsOnline MonitorsInhibition programsInhibition programs
Different methods for corrosion controlDifferent methods for corrosion control
Any method be made more effectiveAny method be made more effective……
……When you understand the When you understand the effect of the corrosion effect of the corrosion
environmentenvironment
Corrosion rates vary with Corrosion rates vary with process conditionsprocess conditions
5.5% NaCl
5.5% NaCl, 5 atm
5.5% NaCl, 85 °C
5.5% NaCl, 10 °C, 15 atm
It helps to know the effect It helps to know the effect of variations in the fieldof variations in the field
To interpret coupon To interpret coupon and monitor dataand monitor data……
To locate where To locate where to place sensors & to place sensors & couponscoupons……Wait for a failureWait for a failure……??Rely on past experience?Rely on past experience?
CouponsCouponsOnline MonitorsOnline Monitors
Tell you what has already Tell you what has already happened, happened, notnot what will what will
happenhappen
OLI OLI getsgetsthethechemistrychemistryrightright
OLI tools can helpOLI tools can help
Phase splitsDew pointpH
Understand what’s happening in your systemUnderstand what’s happening in your system
Protective ScalePassive Film
Active Corrosion (dissolution)
pH
Determine the rate limiting redox processesDetermine the rate limiting redox processes
Rate-limiting cathodic process
Activation controlled
Passive region
Determine pitting potential and max growth rateDetermine pitting potential and max growth rate
PittingNo Pitting
Pro-active AnalysisPro-active Analysis
Test Corrective ActionsTest Corrective Actions•• Determine optimum pHDetermine optimum pH•• Screen alloys and inhibitorsScreen alloys and inhibitors•• Assess process changesAssess process changes
Focus Lab workFocus Lab work
Eliminate potential problems Eliminate potential problems before they occurbefore they occur
The Corrosion AnalyzerThe Corrosion AnalyzerTool for understanding the corrosion environment
Mechanistically-based software toolMechanisticallyMechanistically--based software toolbased software tool
SpeciationKinetics of uniform corrosion
Partial anodic and cathodicprocesses
Transport propertiesRepassivation
SpeciationSpeciationKinetics of uniform corrosionKinetics of uniform corrosion
Partial anodic and Partial anodic and cathodiccathodicprocessesprocesses
Transport propertiesTransport propertiesRepassivationRepassivation
Complete speciation model for complex mixtures
Phase and chemical reaction equilibria
Accurate pH prediction
Redox chemistry
Comprehensive coverage of industrial chemical and petroleum systems
Complete speciation model for complex Complete speciation model for complex mixturesmixtures
Phase and chemical reaction equilibriaPhase and chemical reaction equilibria
Accurate pH predictionAccurate pH prediction
Redox chemistryRedox chemistry
Comprehensive coverage of industrial Comprehensive coverage of industrial chemical and petroleum systemschemical and petroleum systems
The Corrosion AnalyzerThe Corrosion AnalyzerBased on the OLI Engine
The Corrosion AnalyzerThe Corrosion AnalyzerBased on the OLI Engine
ThermophysicalThermophysical properties predictionproperties prediction
Phenomenological and unique aqueous Phenomenological and unique aqueous process models including kinetics and process models including kinetics and transporttransport
““OutOut--ofof--thethe--boxbox”” solution and technical solution and technical supportsupport
What It Does…What It DoesWhat It Does……The Corrosion AnalyzerThe Corrosion Analyzer
Predict metal dissolution regime, passive films, and surface depositsPredict metal dissolution regime, passive films, Predict metal dissolution regime, passive films, and surface depositsand surface depositsPredict uniform corrosion rates and the potential for pitting corrosionGenerate real solution stability (Pourbaix) DiagramsProduce theoretical polarization curves
Predict uniform corrosion Predict uniform corrosion rates and the potential for rates and the potential for pitting corrosionpitting corrosionGenerate real solution Generate real solution stability (Pourbaix) stability (Pourbaix) DiagramsDiagramsProduce theoretical Produce theoretical polarization curvespolarization curves
So you can gain insight on …So you can gain insight on So you can gain insight on ……
The Corrosion AnalyzerThe Corrosion Analyzer
Corrosion mechanisms Rate-limiting partial processes for your operating conditionsEffects of process and materials changes
Corrosion mechanisms Corrosion mechanisms RateRate--limiting partial processes for your operating limiting partial processes for your operating conditionsconditionsEffects of process and materials changesEffects of process and materials changes
ThereforeFocusing lab time Reducing risky plant/field testingManaging design, operation, and maintenance
ThereforeThereforeFocusing lab time Focusing lab time Reducing risky plant/field Reducing risky plant/field testingtestingManaging design, operation, Managing design, operation, and maintenanceand maintenance
Today’s seminar “Hands-on” and “How-To”
Using example problems
Examining plots and
diagrams
Understanding the basis of
the predictions
Today’s seminar “HandsHands--onon”” and and ““HowHow--ToTo””
Using example problemsUsing example problems
Examining plots and Examining plots and
diagramsdiagrams
Understanding the basis ofUnderstanding the basis of
the predictionsthe predictions
Perform “Single point” calculationsConstruct / interpret real solution Pourbaix DiagramsCalculate corrosion rates
Evaluate the effects of pH, T, comp / flow
Evaluate polarization curvesGain insight to corrosion mechanismsSee rate limiting steps Can I read them? Can I trust them?
Determine the likelihood of pitting to occur
For your actual field or lab conditions
Perform Perform ““Single pointSingle point”” calculationscalculationsConstruct / interpret real solution Pourbaix DiagramsConstruct / interpret real solution Pourbaix DiagramsCalculate corrosion rates Calculate corrosion rates
Evaluate the effects of pH, T, comp / flowEvaluate the effects of pH, T, comp / flow
Evaluate polarization curvesGain insight to corrosion mechanismsSee rate limiting steps Can I read them? Can I trust them?
Determine the likelihood of pitting to occur
For your actual field or lab conditionsFor your actual field or lab conditions
Today’s SeminarToday’s Seminar