Removal and Reduction of Nonmetallic Inclusions
Nonmetallic (NM) inclusions, which are mostly oxides, sulfides, silicates, nitrides and carbon particles, are a major cause of surface defects and cracking of metallic products. These inclusions may be found in a variety of commercial aluminium products, including aluminum tilt/slide door frames, billet, notebook shells and automotive components.
The removal and reduction of nonmetallic inclusions is essential for protecting the integrity of aluminium products. The key strategies for the removal and reduction of nonmetallic inclusions include improving the production process, developing effective detection techniques and establishing preventive measures. This article aims to discuss the methods for removal and reduction of nonmetallic inclusions.
1. Improve the Production Process
The most important step, firstly, is to carefully analyze the production process in order to identify any deficiencies that could potentially lead to NM inclusions. Potential causes of NM inclusions usually include insufficient mixing, poor degassing, inadequate filtering, contaminated raw materials and inadequate holding times. Once the source of NM inclusions has been identified, corrective action should be taken to minimize or eliminate them.
2. Develop Effective Detection Techniques
The second step involves the development of effective detection techniques to detect the NM inclusions. METAL SCAN, an advanced computer-controlled imaging system, is one of the most important NM-inclusion detection tools. This system operates by scanning samples with an electrically charged imaging pattern known as an “electro-magnetic eddy current”. This pattern captures data representing the size, shape and distribution of NM inclusions.
3. Establish Preventive Measures
Finally, to further reduce the incidence of NM inclusions, preventive measures such as improved cleaning protocols and careful monitoring of production temperatures should be established. Improved cleaning protocols involve the elimination of any oils, greases and other contaminants from the production process. Monitoring of production temperatures involves the continuous monitoring of production temperatures and their influences on the formation of NM inclusions.
Conclusion
In conclusion, the prevention of nonmetallic inclusions is important for the protection and integrity of aluminium products. The key strategies for the removal and reduction of NM inclusions include improving the production process, developing effective detection techniques and establishing preventive measures.
