Chromizing, Phosphating,Vitrification, Silane:
Chromization Principle: chromate solution and metal reaction, produce chromization layer on the surface of the workpiece.
Application: mainly for aluminum, magnesium and its alloys
when dealing with steel, often matching used with phosphating.
Function: increase the protection ability and the corrosion resistance of the workpiece, increase the surface roughness of the workpiece, and improve the adhesion of the coating.
Phosphating Principle: chemical and electrochemical reactions form phosphate chemical conversion film, that is phosphating membrane.
Application: steel, nonferrous metal (aluminum, zinc) workpiece can also be applied
Function: strengthen the binding force between thecoating layer and the workpiece to enhance the adhesion of workpiece surface and improve the decoration
Disadvantage: the treatment of phosphorus, zinc, nickel, manganese, chromium and sediment does not meet the requirements of environmental protection.
Vitrification Principle: based on the combination of silane, zirconium salt and silane zirconium salt, after adding special film-forming auxiliaries, chemical treatment on the surface of the workpiece to form a hybrid and insoluble nano scale ceramic conversion coating.
Application: steel, zinc plate and aluminum
Function: Improve the corrosion resistance and impact resistance of the workpiece
Advantages: environmental protection
corrosion resistance is better than phosphating
small damage to equipment can prolong the life of equipment
the coating is thinner, lower cost, and better impact resistance
Silane Principle: silane is combined between metal and organic coatings, through chemical reaction, so that metal substrate and coating firmly combined.
Application: suitable for all inorganic materials and organic coatings surface connection
Function: improve the adhesion of the workpiece surface and improve the corrosion resistance.
Advantages: environmental protection, energy saving
reduce water consumption
low cost of phosphating and low maintenance cost
it can be carried out at room temperature without heating
Silane & Vitrification have higher requirements for oil removal.,pure water,and need to control the conductivity and pH value.