NEWS

08-26

2019

Small surface dyeing process for copper and copper alloys

Copper and copper alloys can be dyed with a dye. BH copper and copper alloy dyes are divided into three types: A, B and C. Type A is red bronze (or brown), type B is grayish black, and type C is bronze. Suitable for dyeing copper and copper alloy products, handicrafts, daily necessities and brass-plated products. Generally, Type A and Type C dyes are suitable for dyeing brass zippers, and Type B dyes are suitable for copper and copper alloy (or copper plating) products. It is reported that the dye has the advantages of fast dyeing speed at normal temperature, long service life of the solution, low production cost, no corrosion of the dyeing liquid and no staining of the cloth.　　

08-26

2019

Development and application of copper and copper alloys

Humans have used copper and its alloys for thousands of years. The main mining area of ​​copper in ancient Rome was Cyprus, so it was originally named cyprium (meaning the metal of Cyprus) and later became cuprum, which is English: copper, French: cuivre and German: the source of Kupfer. Divalent copper salts are common copper compounds, often blue or green, and are sources of mineral colors such as azurite and turquoise, and have been widely used as pigments in history. The copper building structure is corroded to produce patina (basic copper carbonate). Art Deco mainly uses metallic copper and copper-containing pigments [1].　

08-26

2019

Popular knowledge of copper alloy products

Brass is a copper alloy with zinc as the main additive element. It has a beautiful yellow color and is collectively called brass. The copper-zinc binary alloy is called ordinary brass or simple brass. Brass with more than three yuan is called special brass or complex brass. Brass alloys containing less than 36% zinc are composed of solid solution and have good cold workability. For example, brass containing 30% zinc is commonly used to make bullet casings, commonly known as cartridge brass or seven-three brass. Brass alloys containing between 36 and 42% zinc are composed of solid solution, the most common of which is 40% brass with 40% zinc. In order to improve the performance of ordinary brass, other elements such as aluminum, nickel, manganese, tin, silicon, lead, etc. are often added.