Blackening Chemicals For Metal Working
- Blackening chemicals are used in metalworking to create a black oxide coating on metals, which can enhance their appearance, provide mild corrosion resistance, and reduce light reflection. Here are some common blackening processes and chemicals used for different metals:
1. Cold Blackening
- Iron and Steel:
. Chemical: Selenium Dioxide (SeO2)
. Process: The metal is immersed in a solution containing the chemical at room temperature. A reaction occurs, creating a black oxide layer.
2. Hot Blackening
- Iron and Steel:
. Chemical: Sodium Hydroxide (NaOH) and Sodium Nitrate (NaNO3)
. Process: The metal is dipped into a series of hot chemical baths. The process typically includes cleaning, blackening, and sealing steps at elevated temperatures.
Keywords
Metal Working
sealing steps
Sodium Nitrate
Hot Blackening
Cold Blackening
different metals
Sodium Hydroxide
room temperature
Selenium Dioxide
light reflection
black oxide layer
hot chemical baths
black oxide coating
Blackening Chemicals
elevated temperatures
mild corrosion resistance
common blackening processes
