GB/T 15260-2016 in English
VALIDStandard Test Method for Intergranular Corrosion of Nickel Alloys by Corrosion of Metals and Alloys
- Issued on:2016-08-29
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 15260-2016金属和合金的腐蚀 镍合金晶间腐蚀试验方法》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
GB/T15260-2016 Standard Interpretation
Standard Background and Technology Evolution Analysis
GB/T15260-2016 "Corrosion of Metals and Alloys - Test Method for Intergranular Corrosion of Nickel Alloys" is a standard for testing the intergranular corrosion characteristics of nickel alloys and their alloys in corrosive environments. This standard replaces the previous GB/T15260-1994 version. The main technical improvements include adding sampling requirements, modifying the test device diagram, optimizing the sample preparation process, and introducing more precise test time control and density constants.
Comparison of standard frameworks
| Method name | Scope of application | Solution composition | Sample preparation | Result evaluation |
|---|---|---|---|---|
| Method A | Determination of intergranular corrosion sensitivity of nickel alloy in ferrous sulfate (III)-sulfuric acid solution. | 25g ferrous sulfate + 236mL sulfuric acid, prepare 600mL test solution. | The total area of the sample is 500mm²~2000mm², and the surface roughness R_a≤0.8μm. | Corrosion rate calculation formula: γ_corr = K·Δm/(A·t), and the corrosion depth is confirmed by metallographic microscope observation. |
| Method B | The intergranular corrosion sensitivity of nickel alloys is determined in copper-copper sulfate-16% sulfuric acid solution, which is particularly suitable for evaluating heat treatment status and weld metals. | 100g copper sulfate + 100mL sulfuric acid, prepare 1000mL test solution. | The recommended sample size is a bent sample or a whole tube sample with a length of 80mm~100mm, a width of 20mm, and a thickness of 3mm~4mm. | Observe the cracks through bending test and flattening test, and observe with a metallographic microscope magnified 10 times. |
| Method C | The intergranular corrosion sensitivity of high molybdenum nickel alloys is determined in hydrochloric acid solution. | 306mL distilled water + 300mL hydrochloric acid, prepare 606mL test solution. | The total area of the specimen is 500mm²~2000mm². It is recommended to use one flask for a single specimen. | The corrosion rate calculation is the same as method A, and the test cycle is 168 hours. |
| Method D | The intergranular corrosion sensitivity of nickel alloys is determined in 65% nitric acid solution. | Prepare 65%±0.2% (mass fraction) nitric acid solution. | The total area of the specimen is 500mm²~2000mm², and the test cycle is 48 hours or extended by negotiation. | The corrosion rate calculation is the same as method A, and the average corrosion rate is recorded through five cycles of testing. |
Implementation Recommendations
1. Method Selection:Choose the appropriate test method based on the specific application environment and requirements of the nickel alloy. For example, for welded parts or heat-treated materials, method B is recommended; for high-molybdenum alloys, method C is preferred.
2. Sample Preparation:Ensure that the sample surface is clean and oil-free, and meets the size and roughness requirements specified in the standard. For samples with complex shapes (such as pipes), special attention should be paid to the selection of sampling locations.
3. Test Equipment:Use a heating device and condenser that meet the requirements of the standard to ensure that the solution remains boiling during the test and to prevent evaporation losses. It is recommended to use a container made of borosilicate glass to ensure corrosion resistance.
4. Data recording and analysis: Record in detail the weight change of the sample before and after the test, the change in solution concentration, and factors that may affect the test results (such as steam escape). When calculating the corrosion rate through the formula, pay attention to the unit conversion and the selection of the constant K.
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