What is the common method of blackening treatment
Sep. 02, 2020
What is the common method of blackening treatment
The commonly used methods of blackening treatment are the traditional alkaline heating blackening and the later normal temperature blackening. However, the blackening process at room temperature is not very effective for low carbon steel. Alkaline blackening is subdivided, and there is a difference between blackening once and blackening twice.
The main components of blackening liquor are sodium hydroxide and sodium nitrite. The temperature required for blackening is relatively large, and a good surface can be obtained between 135-155°C, but the time required is somewhat long.
