GB/T 45879-2025 in English
VALIDCorrosion of metals and alloys—Electrochemical methods for fast test of stress corrosion cracking susceptibility
- Issued on:2025-06-30
- Implemented on:2026-01-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | GB/T 45879-2025 |
| Document status: | VALID |
| Title in English: | Corrosion of metals and alloys—Electrochemical methods for fast test of stress corrosion cracking susceptibility |
| Title in Chinese: | 金属和合金的腐蚀 应力腐蚀敏感性电化学快速试验方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2025-06-30 |
| Implemented on: | 2026-01-01 |
| ICS Classification: | 77.060-Corrosion of metals |
| Chinese Classification: | H25-Metal chemical property test method |
| Professional Classification: | GB-National Standard |
| Related Topics: | Self-corrosion potential test method
electrochemically polarized Self-corrosion potential test method metal corrosion potential Quick method for copper corrosion Physical and chemical rapid test method Corrosion potential and corrosion current Stress Corrosion Apparatus Stress Corrosion Apparatus Corrosion of metals and alloys Metals and Alloys Corrosive Chemical Emergency Response Methods |
《GB/T 45879-2025金属和合金的腐蚀 应力腐蚀敏感性电化学快速试验方法》由TC183（全国钢标准化技术委员会）归口，TC183SC11（全国钢标准化技术委员会金属和合金的腐蚀分会）执行，主管部门为中国钢铁工业协会。
Introduction
Technical Background and Evolution of the Standard
This standard innovatively proposes a fast/slow scan rate hyperbola comparison method based on a non-steady-state electrochemical theoretical model. Compared with the traditional slow strain rate test (SSRT), it can shorten the test cycle by more than 80%. Technology Development Context:
| Method Type | Test Cycle | Sensitivity | Applicable Scenarios |
|---|---|---|---|
| Traditional SSRT | 7-15 days | High | Laboratory Research |
| U-bend Test | 30-90 days | Medium | Quality Acceptance |
| This Method | 2-4 hours | High | Engineering Site/Laboratory |
Core Test Principles
Through Comparison class=instrument>Electrochemical workstation measured fast scan (>50mV/s) and slow scan (<0.5mV/s) polarization curve differences:
- Fast scan current (if): simulates the limit diffusion state of the crack tip
- Slow scan current (is): reflects the steady-state corrosion in the non-crack tip area
Key judgment formula:
| Mechanism type | Current relationship | Calculation formula |
|---|---|---|
| Anodic dissolution (AD) | if>is>0 | Iscc=ka·if·(if-is)/is+I0 |
| Hydrogen embrittlement (HE) | if,is<0 | Iscc=kc·|is|+Ic |
Engineering Application Case
Test on X80 Pipeline Steel in Acidic Soil Environment:
- At a fast scan rate of 50 mV/s, if was measured to be 48.42 μA/cm2
- At a slow scan rate of 0.5 mV/s, is was measured to be 15.74 μA/cm2
- Substituting this into the formula for the AD+HE hybrid mechanism, Iscc was calculated to be 32.26%
The deviation from the traditional SSRT method was <±5%, verifying the reliability of this method.
Implementation Recommendations
- Laboratory Verification: The new system must first pass the SSRT calibration coefficient
- Field Monitoring: It is recommended to conduct potential scanning reviews every quarter
- Data Correction: Recalibration should be performed when environmental parameters change by more than 20%
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