Method for cutting, cleaning, and storing spring fracture surfaces

Methods for cutting, cleaning, and storing spring fracture surfaces
2、 Cleaning of fracture surfaces If the fracture surface is contaminated, damaged, or corroded due to various reasons, it will bring difficulties to the analysis. Therefore, it is necessary to clean the fracture surface. Different methods should be used to clean fractures with different pollution conditions
1) For the oil contaminated fracture, first wash the oil with gasoline to remove the grease, and then put the broken ring into a glass lid containing stick solutions such as acetone, petroleum ether, or trichloromethane. Place the glass dish in an ultrasonic oscillator for ultrasonic cleaning. If there is no ultrasonic cleaning machine, a soft bristled brush dipped in organic solvent can be used for cleaning
2) For fractures that have been exposed to humid air for a long time and have severe rust, observation can only be made after removing the oxide film. It can be cleaned with organic solution, ultrasound or replication method first. If the effect is not good, chemical methods should be used for cleaning
If the rust layer on the surface of the fracture is thick and cannot be removed with chemical solution, electrolytic method can be used for rust removal
After chemical cleaning, the fracture should be immediately cleaned in a dilute Na2CO3 or NaHCO3 solution, and then cleaned with distilled water, alcohol, and dried for storage
(3) The fracture surface that occurs in a corrosive environment is generally analyzed by X-ray, electron probe, or energy dispersive spectrometer to determine the composition and structure of the corrosion products before observing and analyzing the fracture surface. Because these corrosion products are beneficial for analyzing the cause of fracture
Chemical or electrochemical cleaning can damage the fracture morphology to some extent and can only be used last
In the analysis of accident fracture surfaces, it is not urgent to remove surface coverings. It is necessary to carefully analyze the coverings and confirm that they are of no value to the analysis before cleaning
Methods for cutting, cleaning, and storing spring fracture surfaces
3、 Preservation of fracture surface It is best to observe the fracture immediately after receiving it. If there is no time to observe due to time and conditions limitations, the fracture should be properly stored to maintain the freshness of the cut day. Different methods can be adopted in different situations
1. Fresh fractures in the atmosphere should be immediately placed in a dryer or in other dry and dust-free places to avoid moisture and oxidation of the fractures
2. Do not touch the surface of the fracture or match the mating section with your hands to avoid minimal human damage
3. To prevent rusting or corrosion on the fracture surface, a protective material such as cellulose acetate melt, epoxy resin, or anti rust paint can be applied, but the application material cannot corrode the fracture surface
4. The cleaned fracture should be soaked in anhydrous alcohol solution or stored in a dryer
5. Protective measures should be taken when taking samples from large fracture surfaces. If cellulose acetate acetone solution is applied to the fracture surface and left to dry before cutting. When using a hacksaw to cut, avoid sawdust or other debris falling on the surface of the fracture
If small foreign objects are found on the fracture surface, they can be fixed with A4 paper to prevent loss