Beryllium bronze is the "king of elasticity" in copper alloys. After solid solution aging heat treatment, products with high strength and high conductivity can be obtained. High-strength cast beryllium copper alloy, after heat treatment, not only has high strength, high hardness, but also has the advantages of wear resistance and corrosion resistance, excellent casting performance, beryllium bronze alloy is suitable for manufacturing various molds, explosion-proof safety tools, wear resistance Parts such as cams, gears, worm wheels, bearings, etc. Therefore beryllium copper alloys have been widely used in many important industrial materials.
However, when exporting by sea, a large amount of beryllium copper alloy suffered from salt in seawater and corrosion with relatively high humidity. And serious losses. This article mainly describes the surface treatment process of beryllium copper alloy in explosion-proof tools, which will reduce corrosion when it is exported by sea.
Beryllium copper master alloy (in accordance with YB8530-75 standard, hereinafter referred to as beryllium copper alloy) is an alloy with beryllium as the main raw material. It is a bridge-out hardening alloy. After aging hardening treatment, it can reach the strength and alloy equivalent Hardness, at the same time, it also has the characteristics of not generating sparks under severe impact. Therefore, it is the most ideal material for manufacturing safety explosion-proof and fire-proof tools.
At room temperature, C17300 beryllium copper alloy has a very bright color and does not fade for a long time. Therefore, many tools and crafts made by it are loved by everyone. However, in a humid environment, copper is prone to discoloration, which will cause scrap of these products and make export of these products a problem. Therefore, the surface of the beryllium copper alloy needs to be processed to reduce or even not corrode in the humid environment during sea transportation. The surface treatment includes coating, polishing, degreasing, rust removal, passivation and other processes.
Electrolytic degreasing is a method of removing oil stains by placing a workpiece on the cathode or anode for electrolysis. Its degreasing efficiency and quality are better than chemical degreasing. Often used as final degreasing before plating.
1. The essence of electrolysis oil is electrolyzed water: 2H2O → 2H2 ↑ + O2 ↑
2. Hydrogen evolution on the cathode: 2H ++ 2e = H2 ↑
3. Precipitation of oxygen on the anode: 4OH--4e = 2H2O + O2 ↑
The higher the surface finish of the workpiece substrate, the better the coating film is combined with the workpiece, and the better the corrosion resistance. Therefore, in order to improve the quality of the surface coating of the workpiece, the workpiece is mechanically polished before being coated. After the workpiece has been polished and the oil is removed, the rust spots in some parts have not been removed or the surface is in a passivated state.
Therefore, activation treatment is required before plating. Commonly used etchants are sulfuric acid and hydrochloric acid. In this experiment, both bright pickling method and nitric acid, sulfuric acid and hydrochloric acid are used. Because the workpiece is a beryllium copper alloy that does not react with hydrochloric acid, hydrochloric acid cannot be used for rust removal alone.
However, when exporting by sea, a large amount of beryllium copper alloy suffered from salt in seawater and corrosion with relatively high humidity. And serious losses. This article mainly describes the surface treatment process of beryllium copper alloy in explosion-proof tools, which will reduce corrosion when it is exported by sea.
Beryllium copper master alloy (in accordance with YB8530-75 standard, hereinafter referred to as beryllium copper alloy) is an alloy with beryllium as the main raw material. It is a bridge-out hardening alloy. After aging hardening treatment, it can reach the strength and alloy equivalent Hardness, at the same time, it also has the characteristics of not generating sparks under severe impact. Therefore, it is the most ideal material for manufacturing safety explosion-proof and fire-proof tools.
At room temperature, C17300 beryllium copper alloy has a very bright color and does not fade for a long time. Therefore, many tools and crafts made by it are loved by everyone. However, in a humid environment, copper is prone to discoloration, which will cause scrap of these products and make export of these products a problem. Therefore, the surface of the beryllium copper alloy needs to be processed to reduce or even not corrode in the humid environment during sea transportation. The surface treatment includes coating, polishing, degreasing, rust removal, passivation and other processes.
C17300 beryllium copper --- electric degreasing process
Electrolytic degreasing is a method of removing oil stains by placing a workpiece on the cathode or anode for electrolysis. Its degreasing efficiency and quality are better than chemical degreasing. Often used as final degreasing before plating.
1. The essence of electrolysis oil is electrolyzed water: 2H2O → 2H2 ↑ + O2 ↑
2. Hydrogen evolution on the cathode: 2H ++ 2e = H2 ↑
3. Precipitation of oxygen on the anode: 4OH--4e = 2H2O + O2 ↑
C17300 --- Beryllium copper polishing
The higher the surface finish of the workpiece substrate, the better the coating film is combined with the workpiece, and the better the corrosion resistance. Therefore, in order to improve the quality of the surface coating of the workpiece, the workpiece is mechanically polished before being coated. After the workpiece has been polished and the oil is removed, the rust spots in some parts have not been removed or the surface is in a passivated state.
Therefore, activation treatment is required before plating. Commonly used etchants are sulfuric acid and hydrochloric acid. In this experiment, both bright pickling method and nitric acid, sulfuric acid and hydrochloric acid are used. Because the workpiece is a beryllium copper alloy that does not react with hydrochloric acid, hydrochloric acid cannot be used for rust removal alone.