Pitting & Crevice Corrosion Resistance Guide for Stainless Steels
The testing of pitting and crevice corrosion resistance of stainless steels is a way to determine the resistance of stainless steel to localised corrosion in aggressive environments. The most common methods used to evaluate the pitting and crevice corrosion resistance of stainless steel are ASTM G48, ASTM G150, and ASTM G46. Pitting corrosion occurs when a localised area on the surface of the stainless steel is exposed to a corrosive environment, while crevice corrosion occurs in narrow gaps or crevices between two surfaces.
TRUSTED BY
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Pitting & Crevice Corrosion Resistance – Overview
Pitting and Crevice Corrosion Resistance testing evaluates the susceptibility of stainless steels to localized corrosion in aggressive environments, particularly where chloride ions and stagnant conditions exist. These corrosion forms are highly destructive as they can initiate and propagate rapidly without significant overall material loss.
The testing determines the material’s ability to resist localized breakdown of the passive film under controlled electrochemical or immersion conditions. It provides critical data for material selection, ensuring durability and reliability in corrosive service environments such as marine, chemical, and industrial applications.
Scope, Applications, and Benefits
Scope
Pitting and Crevice Corrosion Resistance testing focuses on assessing localized corrosion behavior of stainless steels under conditions that promote passive film breakdown and restricted fluid flow.
It includes evaluation of critical pitting temperature, crevice corrosion initiation, and resistance to chloride-induced attack, enabling accurate prediction of material performance in aggressive environments.
- Determination of critical pitting temperature (CPT)
- Evaluation of crevice corrosion initiation and propagation
- Assessment of chloride-induced corrosion resistance
- Testing under controlled electrochemical or immersion conditions
- Analysis of passive film stability and breakdown
- Comparison of different stainless steel grades
- Evaluation of surface finish and treatment effects
- Identification of localized corrosion susceptibility
Applications
- Marine and offshore structures
- Chemical processing equipment
- Oil and gas pipelines
- Heat exchangers and storage tanks
- Power generation systems
- Stainless steel component qualification
Benefits
- Identifies susceptibility to localized corrosion
- Supports optimal material selection
- Enhances durability in aggressive environments
- Prevents unexpected localized failures
- Improves corrosion resistance evaluation
- Supports long-term reliability
Pitting & Crevice Corrosion – Process
Sample Preparation & Surface Conditioning
Specimens are cleaned, polished, and prepared to ensure consistent surface condition for accurate corrosion testing.
1Exposure & Environment Simulation
Samples are exposed to chloride-containing solutions under controlled temperature and environmental conditions.
2Corrosion Initiation & Monitoring
Electrochemical or visual methods detect initiation of pitting or crevice corrosion and monitor progression.
3Analysis & Reporting
Results are evaluated to determine corrosion resistance parameters such as CPT and susceptibility levels.
4Pitting & Crevice Corrosion – Technical Specification
| Parameter | Details |
|---|---|
| Test Method | Electrochemical or immersion-based corrosion testing |
| Measurement Type | Pitting potential, CPT, and corrosion rate |
| Sample Type | Stainless steel specimens |
| Loading Type | Chemical exposure in chloride environments |
| Units: | °C (CPT), mV (pitting potential), mm/year |
| Test Conditions | Controlled temperature and chloride concentration |
Instrumentation Used for Testing
- Potentiostat/galvanostat
- Corrosion test cell
- Temperature-controlled bath
- Optical microscope
- Surface analysis tools
- Data acquisition system
Results and Deliverables
- Critical pitting temperature (CPT) values
- Pitting potential measurements
- Crevice corrosion susceptibility data
- Visual and microscopic corrosion assessment
- Material performance comparison
- Detailed corrosion analysis report
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Frequently Asked Questions
Pitting corrosion begins when chloride ions locally disrupt the passive oxide film, creating anodic sites where metal dissolution accelerates, leading to rapid pit formation and growth under otherwise protective conditions.
Crevice corrosion occurs in confined spaces where oxygen depletion and ion concentration changes create highly aggressive localized environments, accelerating metal dissolution compared to uniform corrosion.
Critical pitting temperature represents the minimum temperature at which stable pits form, with higher values indicating better resistance to localized corrosion in chloride environments.
Chromium forms a stable passive oxide layer, while molybdenum improves resistance to localized breakdown and enhances repassivation, collectively increasing resistance to pitting and crevice corrosion.
Chloride ions penetrate and destabilize passive films, promoting localized breakdown and preventing repassivation, which accelerates pit initiation and growth.
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