Abstract
In order to repair or strengthen stainless steel structural parts, the experiment was conducted by using plasma arc cladding technology to prepare 2205 duplex stainless steel (DSS) layers on the surface of Q345 steel. Their macro morphology and microstructure were observed by an optical microscope and the phase composition of microstructure was analyzed by an X-ray diffractometer instrument (XRD). The electrochemical behavior of 2205 DSS cladding layer under different current in 3.5% NaCl etching solution was studied by the potentiodynamic polarization, the electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectrometer (XPS). The results showed that when the current was 100 A, the forming of cladding layer was continuous, complete and fine with the dilution ratio of 11.43%. The mass ratio of austenite to ferrite in the microstructure increased with the increase of current and it was up to the optimum of 1.207 with the current of 100 A. Under such conditions, the self-corrosion potential of the cladding layer was up to the maximum while its corrosion current density reached the minimum, thus the corrosion resistance of the cladding layer reached the optimum. It was attributed to the existence of a large amount of Cr3+ and Mo6+ in the passive film of cladding layer, which can stabilize the passive film and promote the formation of Cr2O3 in the passive film.
Highlights
The results indicated thatconthe stitution of the three species passive film were similar even constitution of the three species passive film were similar evenif ifthe thecurrent currentwas wasdifferent
The 2205 duplex stainless steel (DSS) cladding layer was prepared on the surface of a low carbon steel by plasma arc cladding technology
The current increased from 80 A to 120 A, the dilution ratio of cladding layer increased, and its macro morphology varied
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. 2205 duplex stainless steel (DSS) has good plastic toughness and weldability of austenitic steel and high strength and good corrosion resistance of ferritic steel [1]. 2205 DSS surfacing layer by TIG using ER2209 as surfacing materials and studied the effect of sensitization treatment time on pitting corrosion resistance of surfacing layer. Plasma arc cladding technology as a high-energy beam surface cladding technology and a metal surface treatment technology, is one of the latest technologies developed after surfacing technology and laser cladding technology. With the transfer of plasma arc, the molten metal solidifies rapidly to form a metallurgical bonding layer This technology has the advantages of low dilution rate, dense microstructure, small heataffected zone and good combination between surfacing layer and substrate. The optimal process parameter of preparing 2205 DSS layer by plasma arc cladding will be acquired, which will guide the application of 2205 DSS cladding layer in engineering practice
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