Pitting & Crevice Corrosion Testing for Metals & Alloys
Pitting & Crevice Corrosion Testing evaluates the resistance of stainless steels and alloys to localized corrosion in chloride environments. It determines critical pitting temperature (CPT), pitting potential, and corrosion susceptibility to ensure material durability and reliability in aggressive service conditions.
TRUSTED BY
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Pitting & Crevice Corrosion Testing – Overview
Pitting and Crevice Corrosion Testing evaluates the resistance of materials, particularly stainless steels and alloys, to localized corrosion under aggressive environments such as chloride exposure. These corrosion forms are highly localized and can lead to rapid failure without significant overall material loss.
The testing simulates conditions that promote passive film breakdown and restricted fluid flow, enabling assessment of critical parameters such as pitting potential and crevice corrosion susceptibility. It provides essential data for material selection, durability evaluation, and prevention of unexpected failures in corrosive service conditions.
Scope, Applications, and Benefits
Scope
Pitting and Crevice Corrosion Testing focuses on assessing localized corrosion behavior under controlled laboratory conditions that replicate aggressive service environments.
It includes evaluation of corrosion initiation, propagation, and resistance characteristics to determine material performance in environments prone to passive film breakdown and localized attack.
- Determination of pitting potential and corrosion rate
- Evaluation of crevice corrosion susceptibility
- Testing under chloride-containing environments
- Analysis of passive film breakdown behavior
- Assessment of corrosion initiation and propagation
- Comparison of material grades and surface conditions
- Evaluation under controlled temperature and solution chemistry
- Identification of localized corrosion mechanisms
Applications
- Marine and offshore structures
- Chemical processing equipment
- Oil and gas pipelines
- Heat exchangers and pressure vessels
- Power generation systems
- Material qualification for corrosive environments
Benefits
- Detects susceptibility to localized corrosion
- Supports informed material selection
- Prevents unexpected structural failures
- Enhances durability in aggressive environments
- Provides quantitative corrosion resistance data
- Improves reliability of critical components
Pitting & Crevice Corrosion – Test Process
Sample Preparation & Surface Conditioning
Specimens are cleaned and prepared to ensure uniform surface condition and eliminate contamination effects on corrosion behavior.
1Exposure & Environment Simulation
Samples are subjected to controlled chloride environments under defined temperature and chemical conditions.
2Corrosion Initiation & Monitoring
Electrochemical or visual techniques detect passive film breakdown and monitor localized corrosion development.
3Analysis & Reporting
Results are evaluated to determine corrosion resistance parameters such as pitting potential and susceptibility levels.
4Pitting & Crevice Corrosion – Technical Specification
| Parameter | Details |
|---|---|
| Test Method | Electrochemical or immersion corrosion testing |
| Measurement Type | Pitting potential, corrosion rate, and CPT |
| Sample Type | Stainless steels and corrosion-resistant alloys |
| Loading Type | Chemical exposure under controlled environments |
| Units | mV (pitting potential), °C (CPT), 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 equipment
- Data acquisition system
Results and Deliverables
- Pitting potential values
- Critical pitting temperature (CPT)
- Crevice corrosion susceptibility results
- Visual and microscopic corrosion analysis
- Material comparison data
- Detailed corrosion testing report
Partnering with Infinita Lab for Optimal Results
Infinita Lab addresses the most frustrating pain points in the pitting corrosion testing process: complexity, coordination, and confidentiality. Our platform is built for secure, simplified support, allowing engineering and R&D teams to focus on what matters most: innovation. From kickoff to final report, we orchestrate every detail—fast, seamlessly, and behind the scenes.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote
Frequently Asked Questions
Pitting corrosion initiates when aggressive ions such as chlorides locally disrupt the passive oxide film, creating anodic sites where metal dissolution begins, leading to rapid localized attack under controlled electrochemical or immersion conditions.
Crevice corrosion testing simulates restricted environments where oxygen depletion and ion concentration differences create aggressive localized conditions, enabling evaluation of material performance in joints, seals, and confined spaces prone to accelerated degradation.
Pitting potential represents the electrochemical threshold at which passive film breakdown occurs, with higher values indicating greater resistance to localized corrosion under specific environmental conditions.
Critical pitting temperature defines the minimum temperature at which stable pits initiate, providing a quantitative measure of material resistance to localized corrosion in chloride environments.
Electrochemical techniques measure current and potential changes associated with passive film breakdown, enabling precise detection of corrosion initiation and evaluation of material resistance.
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