In salt-cavern CAES

the injection-production pipes undergo severe corrosion and subsequent failure under service conditions involving the combined effects of multiple factors

namely high temperature

high pressure

and high Cl~- concentration.However

systematic comparative data on the protective potential of laser-clad coatings in such environments remain lacking.In this study

the corrosion resistance of four typical laser-clad alloy coatings was compared in a simulated salt-cavern environment.316L

2205

2Cr13

and INCONEL625 cladding layers were prepared on Q235 steel substrates and subjected to corrosion tests in a simulated dynamic circulating brine environment of salt caverns.The corrosion behavior and passive film characteristics of each coating were evaluated using weight-loss method

electrochemical measurements

and Mott–Schottky analysis.The results show that the INCONEL625 coating exhibits the best corrosion resistance

with an extremely low co

rrosion rate and no pitting occurrence.Its superior performance is attributed to the dense passive film formed by high Cr/Mo contents and the electrostatic repulsion effect of MoO

4

2-

against Cl~-

materials with a higher pitting resistance equivalent number exhibit superior pitting corrosion resistance.