With the rapid advancement of China's marine strategy and the continuous expansion of the scale of naval vessels, the corrosion resistance of naval equipment in the harsh marine environment has become an important issue related to national defense construction. In the many anti-corrosion materials, copper-based alloys represented by marine anti-corrosion materials because of its excellent seawater corrosion resistance, become the focus of the most attention in the manufacture of naval equipment. Among them, the copper alloy material with the brand number of C46200 is known as the "golden armor" of domestic marine equipment for its excellent corrosion resistance, excellent mechanical properties and good processing performance.
I. C46200 copper alloy standard and grade introduction
C46200 copper alloy, also known as "naval brass", belongs to the high-strength marine special copper alloy materials, also known internationally as naval brass (Naval Brass). The material's chemical composition, performance and production process in line with the internationally recognized ASTM (U.S.) standards and GB, JIS (Japanese standard) and other major national standards. At present, China mainly refers to the American Standard ASTM B171/B171M standard for production and inspection.
USA: C46200 (ASTM standard)
China: HSn62-1 (GB/T 5231-2001)
Japan: C4621 (JIS standard)
Germany: CuZn38Sn1 (DIN standard)
C46200 copper alloy is widely recognized and used in the global industry, especially for naval equipment in high salt spray and humid environment.
Second, the chemical composition and elemental analysis of C46200
The main components of C46200 copper alloy are copper (Cu), zinc (Zn) and tin (Sn), and the content of each element is as follows:
Copper Cu: 61% -63% copper is the matrix element of the alloy, giving the material excellent electrical and thermal conductivity, good toughness and ductility, copper content of a reasonable combination of materials with good overall mechanical properties.
Zinc is the second largest component in C46200, accounting for about 35%-38%. The addition of zinc significantly improves the strength and wear resistance of the alloy, and improves its resistance to seawater corrosion, especially suitable for use in marine environments.
Tin Sn: 0.7%-1.5%
Other impurity elements (e.g. Fe, Pb, etc.): Controlled at a very low level (less than 0.1%) to further ensure the stability of the alloy in the marine environment.
The above reasonable element ratio, so that the C46200 copper alloy has the ideal corrosion resistance, strength and processability, in the high salt, high humidity marine environment with excellent performance.
Third, the performance of C46200 alloy in extreme corrosive environment
C46200 alloy due to copper, zinc, tin three elements synergistic effect, in the alloy surface to form a layer of dense, stable protective oxide film, this film has a high degree of resistance to seawater corrosion, to prevent chloride ions penetrate into the metal matrix. Therefore, it can effectively resist pitting, stress corrosion and crevice corrosion in long-term exposure to seawater environment, showing significantly better performance than ordinary brass or other copper alloy materials.
The advantages of C46200 alloy application on ships
The successful application of C46200 copper alloy on ships is mainly due to the following performance advantages:
In high salinity seawater, the corrosion resistance of C46200 copper alloy is much higher than that of traditional copper-zinc alloy or aluminum alloy, which can greatly reduce the maintenance cost of naval equipment and significantly improve the service life of equipment.
The alloy maintains the good thermal and electrical conductivity of copper alloys on the basis of a substantial increase in mechanical strength, suitable for the production of high-load ship parts, propellers, pump shafts and other key components.
C46200 alloy has good castability and cold working performance, and can be processed and molded through die-casting, extrusion and forging, which is suitable for complex naval parts design, and is not easy to produce cracks and deformation during processing.
Fourth, C46200 material future optimization development direction
Although C46200 copper alloy has shown excellent performance, but with the continuous development of China's naval industry, the future optimization of the alloy material still has more space:
Element ratio optimization: further adjust the ratio of copper, zinc, tin, in-depth study of the best corrosion resistance and mechanical properties of the balance point.
C46200 copper alloy is increasingly becoming one of the key materials for the upgrading of Chinese naval equipment due to its excellent corrosion resistance and excellent mechanical properties. In the future, with the in-depth research and development technology and the continuous expansion of the optimization path, the performance of C46200 copper alloy will be further improved, and it will play an even more important role in guaranteeing the safety of China's naval equipment and prolonging the life of ships. The new special copper alloy represented by C46200 will set a new industry benchmark in the field of marine anti-corrosion materials and help China's marine power strategy to be realized rapidly.
