BLACKENING COATING
Put the metal parts into the solution of NaOH, NaNO2 and other potions. At a certain temperature, the parts will react chemically to produce a thin blue (black) oxide film. Blackening can be divided into normal temperature blackening and high temperature blackening. Generally, the surface oxide film of normal temperature blackening is relatively thin, and the effect of secondary blackening is better. The blackening surface treatmenttemperature at high temperature is about 135 ° to 155 ° and the blackening effect is also the best.
What Is Blackening For Metal?
Metal blackening is a common CNC surface finish treatment process. The purpose of blackening is to prevent rust on the metal surface. There are two kinds of metal blackening: alkaline heating blackening and normal temperature blackening. The problem of checking the antirust effect may occur due to process problems in normal temperature blackening.
How Do You Blacken Metal?
The process flow of metal blackening is as follows:
Degreasing: Boil the parts in degreasing solution for 20~30 minutes at 80~100 ℃.
Cold water cleaning: rinse with flowing clean water.
Pickling: wash with hydrochloric acid solution at room temperature for no more than 30 seconds.
Blackening (put the blackening liquid in a stainless-steel container and heat the bottom with an electric furnace)
Water washing: wash with flowing cold water or warm water for 30-60 seconds.
Boiling water cleaning: 2-5 minutes.
Saponification treatment: temperature 80~90°, time 2-3 minutes.
Immerse in oil: immerse in transformer oil or spindle oil at about 80° for 1-3 minutes, and then the finished product is cleaned.
As a professional cnc machining exporter, Richconn provides cnc machining services, blackening coating, precision cnc machining, etc. Want to know more, contact us.
Send product request
Other supplier products
 |
ELECTRONICS CNC MACHINING | ELECTRONICS CNC MACHINING Our purpose is to provide customers with processing services of various testing fixtures, mold parts and non-calibrated ... |
 |
CNC MACHINING MATERIALS | CNC machining has not too many restrictions on CNC material list. Common plastics, metals, or special materials can be processed, but the processin... |
 |
CNC PLASTIC MACHINING | The characteristics of plastic cnc machining chinamaterial are defined by the melting point temperature (150 ° to 450 °) and the use enviro... |
 |
PVD COATING | Physical vapour deposition, just PVD coating, as we usually call it, refers to vacuum ion plating and vacuum sputter plating; Generally speaking, n... |
 |
SURFACE FINISHING | The surface texture treatment requirements of special industries are extremely stringent, such as parts and products in extreme climatic environmen... |
Same products
 |
MaAnt BF-1 Blowing Suction Turbine Fan Dust Cleaner Gun | Seller: PHONEFIX technology Co.,Ltd | MaAnt BF-1 Blowing and Suctioning Turbofan Cleaning Gun is an efficient cordless handheld cleanin... |
 |
industrial sewing machine spares | Seller: Zhejiang Huaqi Information Technology Co., LTD | Our spares are crafted from the highest quality materials to withstand the rigors of industrial u... |
 |
industrial sewing machine spares | Seller: Zhejiang Huaqi Information Technology Co., LTD | At JINZEN, we take immense pride in our diverse and comprehensive product range, catering to ever... |
 |
JM-600VD Velcro automatic feeder | Seller: Zhejiang Huaqi Information Technology Co., LTD | Scope of application: Velcro. By replacing the cutting die, sewing at rounded corners, right angl... |
 |
Nsrh80 Tri-Lobe Roots Blower/ | Seller: Greentech International (Zhangqiu) Co., Ltd | The NSRH type clover spiral roots blower is based on the manufacture and sales of roots blowers, ... |
