28.10/2021
POLEMA will take part in the exhibition Metal Expo-2021
POLEMA JSC will take part in the 27th International Industrial exhibition “Metal Expo – 2021” which will take place from November 9 to 12.
12.10/2021
POLEMA received a record revenue for the III quarter
The Russian powder metallurgy plant POLEMA (part of the IMH) received a record revenue at the end of the third quarter of 2021.
03.06/2011
Progressive materials for multi-functional vacuum coatings
Application fields of materials for multi-functional vacuum coatings, characteristics of sputtering targets and evaporable sources used for technologies of physical deposition of hardening, protective, decorative and light-reflecting coatings, resistive, switching and transparent electro conductive films.
24.05/2011
Molybdenum and tungsten products for production of leucosapphires
POLEMA JSC is the leading global manufacturer of chromium, molybdenum, tungsten products, metal powders and composite materials.
Zink and Zn-Al for coatings
Use
The Zink powder and its alloys are used to protect apparatuses, containers, reservoirs, pools, pipes, heat exchangers, bridges, hydraulic structures, power-industry equipment, vessel hulls, and other metallic structures from continuous and pitting corrosion. Powder ddischarge rate while spraying onto metallic surfaces when creating a coating with a thickness of 200 microns is approximately 1.7-1.8 kg/m2. Handheld gas-fired torches or mechanized apparatuses are used for deposition.
A reliable method for protecting metallic structures made from carbonic and low-alloy steels from corrosion is to apply coatings of Zn-Al alloy to their surfaces. Thermal Zn-Al coating applied using AP-ZnAl16 powder effectively protects structures and equipment used in the atmosphere and in fresh- and saltwater. The servicable life of the coating depends on the thickness of layers applied and can reach several decades.
Zink powder AP-Zn
Chemical composition, %
| Grade | Zn | Fe | Cu | Ti | Pb |
|
AP-Zn Gas-sprayed |
base | 0.1 max | 0.02 max | 0.02 max | 0.02 max |
Particle size (base fraction), microns:
- 0-40;
- 40-100;
- 50-160.
The powder can be prepared with other size requirements.
Powder of Zn-Al alloys AP-ZnAl16
Chemical composition, %
| Grade | Zn | Al | Fe | Cu | Ti | Pb |
|
AP-ZnAl16 Gas-sprayed |
base | 16 | 0.1 max | 0.02 max | 0.02 max | 0.02 max |
Particle size (base fraction), microns:
- -40 (45);
- 40-80, 40-160;
- 140-315.
