Study on the Effect of Rare Earth Ce on Microstructure and Corrosion Resistance of DH36 Ship Plate Steel
In response to the insufficient research on the influence law of rare earth on the corrosion resis-tance of steel and the local corrosion mechanism of rare earth inclusions on ship plate steel,the influence of rare earth Ce content on the microstructure and corrosion resistance of DH36 ship plate steel in a 3.5％NaCl solution was studied using metallographic microscope,scanning electron microscope,laser confocal microscope,and electrochemical workstation.The results indicate that rare earth Ce can refine the grain size of the test steel and reduce the interlayer spacing of pearlite in the test steel.The addition of rare earth Ce transforms the MnS and Al2O3+MnS inclusions in the test steel into MnS+CeAlO3,Mn-Al-O-Ce and Mn-S-Al-O-Ce inclusions.Compared with the test steel without Ce and with 0.001 0％Ce,the corrosion rate of the test steel with 0.009 2％Ce is the lowest,the flocculent corrosion products are the least,the size and number of corrosion pits are the smallest,the surface roughness is relatively small,and it still has a metallic luster in the initial stage.The addition of rare earth Ce increases the corrosion potential and re-duces the corrosion current density of the test steel.When the corrosion time is 5 d,the corrosion current density of the test steel with 0.009 2％Ce is the lowest(2.225 × 10-5 A/cm2),the corrosion voltage is the highest(-1.057 V),and the corrosion resistance performance is the best.
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