ARK 40 arc spray coating has high bonding strength. It can replace aluminum bronze and expensive nickel aluminum, molybdenum and other buffer layers. It is inexpensive and has a certain degree of wear resistance. Since its introduction in the market in 1996, it has been widely used by customers and has earned positive feedback. [Patented product: Hot-sprayed wire ZR96120778.7 (the first wire material patent in China containing rare earth elements).]

Main features

  • General abrasion resistance, suitable for lubricated metal-to-metal wear
  • High bonding strength
  • Useful for spraying large, thick coatings

Typical applications

  • Buffer layers
  • Engine crankshaft and bearing housing repair
  • Restoring dimensions of part surfaces

Chemical composition of deposited metal (%)


Mechanical properties

Bond Strength (MPa)
Acc. to ASTM C633-01
Micro-hardness (HV 0.1) Kg/mm²
>55 (Low carbon steel substrate)380–420

Coating properties

Density (g/cm³)% Prosity% Deposition efficiency

Recommended spraying parameters

Diameter: in (mm)Air pressure (MPa)Current (A)Voltage (V)
116 (1.6)0.5–0.6160–22028–34

Diameters and packaging

Diameter: in (mm)Packaging: lb (kg)
116 (1.6)27.5 (12.5) (Vacuum pack spool)

Metallographic photos

ARK 40 microstructure
Spray coating cross-section microstructure: Left: 100x, right: 200x
Click here to download the datasheet for Kooben ARK 40.