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Selected
chapters from the Corrosion
Monitoring Handbook are available in an Acrobat (pdf)
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The Corrosion
Monitoring Handbook by Neil
Rothwell
Publisher February 2000
Chapter
Two
BASIC
CONCEPTS AND THEORY
2.1 BASIC
ELECTROCHEMICAL THEORY
2.2 TYPES OF CORROSION
2.2.1 Uniform corrosion
2.2.2 Pitting corrosion
2.2.3 Crevice corrosion
2.2.4 Galvanic corrosion
a. General
b. Preferential weld corrosion
2.2.5 Intergranular corrosion
2.2.6 Stress corrosion cracking (SCC)
2.2.7 Erosion corrosion, impingement and cavitation
2.2.8 Selective leaching
2.2.9 Hydrogen embrittlement
2.3 MORE ADVANCED CORROSION THEORY
2.4 PITTING AND GENERAL CORROSION
2.5 PASSIVITY
2.6 DETERMINATION OF CORROSION RATES FROM CORROSION CURRENT
VALUES
2.7 CALCULATING CORROSION RATES FROM ELECTROCHEMICAL MEASUREMENTS
2.7.1 Stern-Geary constant
2.8 CORROSION PROTECTION
2.8.1 Pipeline potential protection criteria
Chapter
Three
PRACTICAL
ISSUES
3.1 CORROSION
MONITORING TECHNIQUES
3.1.1 Weight Loss coupons (WL)
a. Types of Coupon
3.1.2 Ultrasonic Thickness (UT) measurement
3.1.3 Process measurement
3.1.4 Chemical analysis
3.1.5 Iron Count
3.1.6 Bacterial count
3.1.7 Electrical Resistance probe (ER)
3.1.8 Thin Layer Activation (TLA)
3.1.9 Galvanic probe
3.1.10 Hall Effect probe (HE)
3.1.11 Linear Polarisation Resistance (LPR)
3.1.12 Electrochemical
Impedance Spectroscopy (EIS)
3.1.13 Harmonic Analysis (HA)
3.1.14 Current & Potential Logging, Electrochemical Noise (CPL
and EN)
a. Standard data analysis routine
3.1.15 Field Signature Method (FSM) system
3.2 SAND AND EROSIVE PRODUCT MONITORING
3.2.1 Acoustic monitoring
3.2.2 Electrical resistance monitoring
3.3 HYDROGEN PERMEATION (HP)
3.4 INTELLIGENT PIGS
3.5 EMERGING CORROSION MONITORING TECHNIQUES
3.6 BASIC GUIDE TO TECHNIQUE SELECTION
Chapter
Four
EQUIPMENT
AND INSTRUMENTATION
4.1 PROBES
4.1.1 Choice of probe
4.1.2 Probe fittings
a. Retrievable (2 inch high pressure)
b. Retractable
4.1.3 Specialist Probes
4.1.4 Probe elements
4.1.5 Basic guide to probe selection
4.1.6 Basic guide to monitoring selection.
4.2 OTHER INSTRUMENTS & FITTINGS
4.2.1 External corrosion on buried pipelines
a. Monitoring the performance of CP hardware
b. Monitoring the external pipeline condition
4.2.2 Monitoring reinforced steel corrosion in concrete
a. Rebar potential monitoring
b. Guard ring devices
c. Embedded electrochemical sensors
d. Additional techniques e. Summary
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