News Release
Method for checking whether the surface of the spring is clean
Source:
Release time: 2023.05.16
1. Paint method
Drop the degreaser onto the surface of the spring and evaporate to dryness. If there are no traces, the surface of the spring is clean. If a circular ring appears, it indicates the presence of oil stains.
2. Moisturizing method
A clean spring surface is hydrophilic, so it can be completely wetted by water. When the spring surface contains oil stains, there will be a water cut area that is not wetted by water. Based on the principle of hydrophilicity, in addition to the most simple and commonly used exhalation method and atomizer spray method, there are several detection methods as follows. Due to the fact that the oxide film of the spring is also hydrophilic, most of these methods cannot detect whether the oxide film on the surface of the spring accessory has receded completely.
3. Surface tension method
Based on the influence of surface oil pollution on its surface energy, the surface energy of the spring is determined by whether it is soaked in a series of test solutions with different surface tensions, and the cleanliness of its surface is determined accordingly. If a series of solutions ranging from 80% acetic acid and 20% water (V/V, the same below) to 1% ethanol and 99% water are prepared, their surface tension correspondingly increases from 24.5 × 10-5N/CM increased to 66.0 × 10-5N/CM.
4. Visual and optical methods
The oil stains on the surface of the bright spring can be observed with the naked eye and with the help of a magnifying glass or optical microscope. Its disadvantage is that the blunt oxide film and extremely thin oil stains on the surface of the spring cannot be detected. This method cannot detect rough and dull spring surfaces, but it can be determined by wiping the surface with clean and white cotton, cloth, or paper, and then observing whether it is clean.
Drop the degreaser onto the surface of the spring and evaporate to dryness. If there are no traces, the surface of the spring is clean. If a circular ring appears, it indicates the presence of oil stains.
2. Moisturizing method
A clean spring surface is hydrophilic, so it can be completely wetted by water. When the spring surface contains oil stains, there will be a water cut area that is not wetted by water. Based on the principle of hydrophilicity, in addition to the most simple and commonly used exhalation method and atomizer spray method, there are several detection methods as follows. Due to the fact that the oxide film of the spring is also hydrophilic, most of these methods cannot detect whether the oxide film on the surface of the spring accessory has receded completely.
3. Surface tension method
Based on the influence of surface oil pollution on its surface energy, the surface energy of the spring is determined by whether it is soaked in a series of test solutions with different surface tensions, and the cleanliness of its surface is determined accordingly. If a series of solutions ranging from 80% acetic acid and 20% water (V/V, the same below) to 1% ethanol and 99% water are prepared, their surface tension correspondingly increases from 24.5 × 10-5N/CM increased to 66.0 × 10-5N/CM.
4. Visual and optical methods
The oil stains on the surface of the bright spring can be observed with the naked eye and with the help of a magnifying glass or optical microscope. Its disadvantage is that the blunt oxide film and extremely thin oil stains on the surface of the spring cannot be detected. This method cannot detect rough and dull spring surfaces, but it can be determined by wiping the surface with clean and white cotton, cloth, or paper, and then observing whether it is clean.