Plate heat exchanger passivation
Hydrogen content of steam: hydrogen content in plate heat exchanger <200ug/kg at the beginning of operation; hydrogen content <10ug/kg after 72h operation for different pressure plate heat exchangers,the higher the hydrogen content standard is, the higher the hydrogen content standard is.
Monitoring the corrosion rate of the plate: The corrosion rate of the passivation process is obtained by the mass change of the corrosion plate during the passivation process. This parameter is for reference only. The wet heat box and the salt spray box are quickly tested; one is that at 100% relative humidity, after 2 weeks, the passivation sheet does not show rust spots and then the corrosion rate is calculated.
Between the passivation film thickness and the polarization parameter: the corrosion resistance of the passivation film is tested with a neutral copper sulphate solution, that is, the copper sulphate solution is added dropwise on the passivation sheet to obtain a test piece, and the longer the copper plating phenomenon occurs. , the better the passivation quality.