Hot Corrosion Behaviour of Detonation Gun Sprayed Stellite-6 and Stellite-21 Coating on Boiler Steel SAE 431 at 900°C

Table 1

Parameters used in detonation gun spray.

Parameters	Stellite-6/-21 coating
Oxygen flow rate (O2)	3120 SLPH
Pressure	0.2 MPa
Acetylene flow rate (C2H2)	2400 SLPH
Pressure	0.14 MPa
Nitrogen flow rate (N2)	1040 SLPH
Pressure	0.4 MPa
Spray angle	90°
Spray distance	180 mm
Power	450 VA
Fire rate	1–10 Hz
Coating thickness (average)	250 µm
Gun internal diameter	22 mm
Length of gun	1.5 m
Position of powder injector	90° to the sample
Particle velocity	600–900 m/s
Temperature of plasma	3900°C