NSK bearing rust is the cause of damage
Causes of Rust Damage in NSK Bearings
Source: China Bearing Network | Date: April 6, 2014
Maintaining the integrity and performance of NSK bearings is crucial for their longevity and reliability. One common issue that can lead to damage is rust. Understanding the causes and proper maintenance methods is essential to prevent this problem. **Cleaning the Appearance** Before applying any protective measures, it's important to ensure the bearing surface is clean. This involves removing any existing rust preventive materials and assessing the condition. Common cleaning methods include: - **Solvent Removal**: Using solvents to dissolve and remove old coatings. - **Chemical Treatment**: Applying chemical solutions to neutralize and clean the surface. - **Mechanical Cleaning**: Utilizing brushes or sanding to physically remove contaminants. After cleaning, the surface should be dry and free from moisture. This can be achieved by using filtered dry compressed air, a dryer set at 120–170°C, or simply wiping with clean gauze. **Applying Anti-Rust Oil** Once the surface is clean and dry, anti-rust oil should be applied properly. There are several methods: 1. **Soaking Method**: Small parts can be submerged in anti-rust grease to coat the surface evenly. The thickness of the oil film can be adjusted based on temperature or viscosity. 2. **Brushing Method**: Ideal for large or irregularly shaped items, this method allows for precise application without pooling or leakage. 3. **Spraying Method**: Used for large components, this method requires compressed air at around 0.77 MPa. It’s suitable for thin-layer or solvent-diluted oils but must be done safely with proper fire prevention measures. **Factors Affecting Metal Corrosion** Metal corrosion is influenced by both internal and external factors: 1. **Material Composition**: The type of metal and its structure play a role in its susceptibility to corrosion. 2. **Surface Finish**: Uneven surfaces can create oxygen concentration differences, leading to electrochemical corrosion. 3. **Environmental Exposure**: The presence of salts, acids, or other chemicals in the environment can accelerate corrosion. 4. **Humidity and Temperature**: High humidity and extreme temperatures increase the likelihood of rust formation. 5. **Corrosive Media**: Contact with water, salt, or industrial pollutants can cause rapid degradation. **Why Does Sweat Cause Corrosion?** Human sweat, which is slightly acidic (pH 5–6), contains salts like sodium and potassium, as well as organic acids such as lactic acid and citric acid. When it comes into contact with metal, it forms a thin film that can trigger electrochemical reactions, leading to corrosion. **Common Causes of Bearing Damage** 1. **Improper Equipment Use (16%)** - Forcing tools onto bearings or hitting them with hammers can cause deformation. - Incorrect installation, misalignment, or improper clearance can also lead to damage. *Expert Advice:* Always use appropriate tools and verify alignment with precision instruments. 2. **Poor Lubrication (50%)** - Lack of lubricant, incorrect type, or improper application can result in early failure. *Expert Advice:* Choose the right lubricant and follow correct application techniques. 3. **Contamination (14%)** - Dust, dirt, or metal particles entering the bearing can cause wear and damage. *Expert Advice:* Keep bearings sealed until use and maintain a clean working environment. 4. **Fatigue (34%)** - Overloading, lack of maintenance, or aging equipment can lead to fatigue damage. *Expert Advice:* Select the right bearing for the application and replace worn-out units promptly.
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