ISO 17475 Galvanic Corrosion Testing
The ISO 17475 standard provides a framework to evaluate galvanic corrosion between metallic components. This testing is critical for industries where diverse metals come into contact, such as in the aerospace, marine, and chemical processing sectors. Understanding how different metal alloys interact under specific environmental conditions ensures that materials are selected appropriately to prevent costly failures.
Galvanic corrosion occurs when dissimilar metals are in electrical contact with an electrolyte (such as seawater or moist air), leading to a current flow from the more noble (less reactive) metal to the less noble (more reactive) one. This process can lead to significant degradation of components, especially in environments where moisture is present.
Compliance with ISO 17475 ensures that your product design withstands real-world conditions, preventing premature failures and costly repairs. Our testing adheres strictly to this standard, providing accurate results to help you make informed decisions regarding material selection.
Testing Procedure: Specimens are prepared according to the ISO 17475 guidelines. This involves assembling two or more dissimilar metals in a controlled environment. The test setup includes an electrolyte solution that simulates real-world conditions such as seawater, chlorinated water, or industrial environments.
The testing process typically lasts for several days, depending on the specific environment being simulated and the anticipated rate of corrosion. During this time, electrical current is monitored continuously to detect galvanic activity between metals. Once the test period concludes, the specimens are carefully analyzed for signs of corrosion, including weight loss measurements, visual inspections, and possibly cross-sectional analysis.
Acceptance Criteria: The acceptance criteria for ISO 17475 testing depend on the specific application but generally include a maximum allowable weight loss or an upper limit to the galvanic current. Our lab ensures that all specimens meet these stringent requirements, providing confidence in your product's durability and reliability.
Instrumentation: The testing is conducted using advanced electrochemical instrumentation capable of measuring minute changes in electrical current. This precision equipment allows us to detect even subtle signs of galvanic corrosion, ensuring accurate results.
| Absorption Rate (%) | Specimen Weight (g) | Test Duration (hours) |
|---|---|---|
| 0.25 ± 0.1 | 45 ± 3 | 72 ± 6 |
| 0.35 ± 0.1 | 50 ± 3 | 96 ± 8 |
The table above outlines typical parameters for our testing, which can be adjusted based on specific customer requirements.
Applied Standards
| Standard | Description |
|---|---|
| ISO 17475:2018 | This standard provides a method for assessing galvanic corrosion between metallic components. It specifies the test setup, procedures, and acceptance criteria. |
| ISO 9227:1994 | Provides a guide for the prevention of galvanic corrosion in marine engineering structures. |
The ISO 17475 standard is widely recognized and accepted, ensuring consistent results across different laboratories. By adhering to these standards, we provide reliable test data that you can trust.
Scope and Methodology
- Test Setup: Specimens are prepared according to ISO 17475 guidelines with two or more dissimilar metals in a controlled environment.
- Electrolyte Solution: The electrolyte solution used simulates real-world conditions such as seawater, chlorinated water, or industrial environments.
- Testing Duration: Testing can last for several days, depending on the specific environmental condition being simulated and the anticipated rate of corrosion.
- Data Collection: Continuous monitoring of electrical current to detect galvanic activity between metals. Specimens are analyzed post-test for signs of corrosion.
The methodology is designed to mimic real-world conditions as closely as possible, ensuring that the results accurately reflect how your product will perform in actual use.
| Electrolyte Type | Temperature (°C) | pH Level | Conductivity (µS/cm) |
|---|---|---|---|
| Seawater | 25 ± 2 | 7.8 ± 0.3 | 30,000 ± 1,000 |
| Chlorinated Water | 20 ± 1 | 6.5 ± 0.5 | 12,000 ± 800 |
The table above outlines the typical parameters used in our testing to ensure accurate and reliable results.
Customer Impact and Satisfaction
- Quality Assurance: Compliance with ISO 17475 ensures that your product meets the highest quality standards, enhancing customer trust and satisfaction.
- Risk Management: Early identification of potential galvanic corrosion issues through testing helps mitigate risks associated with premature failures.
- Compliance: Adherence to international standards like ISO 17475 ensures that your product meets regulatory requirements, avoiding costly non-compliance penalties.
- Durability: By selecting materials that pass our rigorous testing, you can be confident in the long-term durability and reliability of your products.
Our customers consistently report high levels of satisfaction with our ISO 17475 galvanic corrosion testing services. We pride ourselves on providing accurate, reliable results that help you make informed decisions about material selection and design.
