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Pretreatment of stainless steel forgings

Pretreatment of stainless steel forgings

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  • Time of issue:2022-05-07 11:06
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(Summary description)Pretreatment is an important step before entering the surface treatment of stainless steel forgings (including pickling, chemical polishing and electrochemical polishing, electroplating, passivation, black, color, chemical processing, etc.).

Pretreatment of stainless steel forgings

(Summary description)Pretreatment is an important step before entering the surface treatment of stainless steel forgings (including pickling, chemical polishing and electrochemical polishing, electroplating, passivation, black, color, chemical processing, etc.).

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2022-05-07 11:06
  • Views:
Information

 

1. The necessity of pretreatment  

 

Pretreatment is an important step before entering the surface treatment of stainless steel forgings (including pickling, chemical polishing and electrochemical polishing, electroplating, passivation, black, color, chemical processing, etc.).  In the process of processing stainless steel forgings, the surface is likely to stick on oil, burr, the formation of rough surface and oxide, so before surface treatment, must first remove oil, burr, uneven surface and oxide, in order to make the subsequent processing to obtain satisfactory results.  

 

2. Dispose of removed dirt  

 

Dirt to be removed from the surface of stainless steel during pretreatment;  Can be divided into organic and inorganic two categories.  

 

(1) Organic contaminants.  These oil stains mainly come from stainless steel parts in the process of the use of lubricating oil, cutting oil, quenching oil, polishing paste and polishing paste and finger prints.  

 

(2) inorganic filth.  It includes dirt, dust particles, oxides and other contaminants generated during heat treatment.  

 

 

3. Steps of pretreatment of stainless steel forgings  

 

(1) surface mechanical leveling "eliminate the roughness of the stainless steel surface, after mechanical grinding, polishing to achieve a certain surface finish.  

 

(2) in addition to the oil.  Remove oil stains from surfaces.  

 

(3) the acid pickling.  Remove the oxide from the surface.  

 

(4) weak corrosion.  Activate the surface to be treated, remove the surface and Hi film, exposing the metal crystal structure.  

 

 

4. Surface pretreatment of stainless steel forgings  

 

(1) Mechanical method.  The application of a polisher, polisher or other machine to remove the roughness of the surface, to polish, polish.  

 

(2) Chemical method.  Use alkaline solution to remove oil, acid solution pickling and organic solvent to dissolve oil and stain.  

 

(3) Electrochemical method.  Application of electrochemical oil removal and electrochemical etching.  

 

(4) Rolling, centrifugal rolling, centrifugal plate finishing and rotating finishing.  Suitable for small parts, both leveling and removing oxide skin.  

 

(5) the sand blasting.  Suitable for large interproduct treatment, both decontamination and removal of oxide skin.  

 

Therefore, according to the different surface state, the quality requirements for subsequent treatment of stainless steel, the use of appropriate pretreatment methods.  

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