Hello all
,
I will coat twice-layers coating on the inside surface of the reactor for synthesis of ammonium carbamide (urea).
First layer (bond layer) will be NiAl, flame spraying, 100 micron thickness.
Second layer will be SS 04Cr19Ni11Mo2, flame spraying, 350 micron thickness.
SS 04Cr19Ni11Mo2 : Carbon 0.014, Chromium 18.2, Nickel 11.8, Molybdenum 1.95, Manganese 1.88, Phosphorus 0.022, Sulfur 0.012, Silicon 0.53, Copper 0.093, Cobalt 0.24, Titanium 0.10
Material of the reactor is 724L stainless steel.
Working conditions:temperature of 200 degrees Celsius, pressure of 250 atmospheres.
Synthesis of ammonium carbamide (urea).
I suppose that this twice-layers coating will be protecting for steel and welding seams of reactor during 5 years.
But I have some doubts about low percent of nickel in SS 04Cr19Ni11Mo2.
If this twice-layers coating will not be protecting during 5 years, please correct me.
If first layer will be 150 micron, will twice-layers coating be protecting for steel and welding seams of reactor more than 5 years?
If second layer will be 500 micron, will twice-layers coating be protecting for steel and welding seams of reactor more than 5 years?