As we all know, metal materials mostly refer to pure metals, various alloys and intermetallic compounds in industrial applications. It has excellent process performance and use performance, and can realize multiple functions and modeling of products according to the designer's design ideas. It is widely used in industrial design and becomes the pillar material of modern industry.
The vast majority of metal elements exist in nature in a combined state. This is because the chemical properties of most metals are relatively active, and only a few metals such as gold and silver exist in free state. At present, more than 70 kinds of pure metals are well known, among which iron, copper, aluminum, silver, lead, zinc and so on are common. The alloy usually refers to two or more kinds of metal or metal and nonmetal combination, and has metal characteristics of the material. Common alloys such as aluminum alloy, titanium alloy, etc.
The structure and properties of metal material gold determine its application. The properties of metal materials include technological properties and service properties. Process performance refers to the performance of materials to adapt to processing conditions in the process of manufacturing, such as castability, forging, machinability, etc; Service performance refers to the performance under service conditions and environment, including mechanical properties (such as strength, plasticity, hardness), physical properties (such as melting point, ductility, conductivity) and chemical properties (such as corrosion resistance, oxidation resistance, etc.). Metal materials are widely used in daily life because of their various properties and wide existence in nature. They are one of the most important and widely used materials in modern industry.
However, with the progress of science, the common metal materials can not meet the needs of social development. People continue to develop a variety of special alloy materials to meet the special needs of wear resistance, high temperature resistance, acid and alkali corrosion resistance, high strength and high hardness. However, these alloy materials are often expensive and difficult to meet the diverse performance requirements of designers at the same time. In 1983, Professor Tang bell of Birmingham University of England first proposed the concept of surface engineering, which uses a very small amount of materials to modify the surface of metal matrix, so that the metal surface can be protected and strengthened, and the problems that can not be solved by a single material can be solved, so as to greatly improve the service life and reliability of products.
Metal surface treatment technology metal surface treatment technology is not only the "beauty technique" of metal material products, but also the improvement technology of many product performance, and also the advanced product manufacturing technology. Because of its high practicability, high quality, high efficiency and low consumption, it has been widely used in daily life, machinery manufacturing, aerospace and navigation, transportation energy, petrochemical and biomedical industries.
