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