研究目的
To study and compare the passive film properties of as-received selective laser-melted 316L stainless steel (SLMed 316L SS) without obvious pores with those of wrought and solution-annealed (SA) SLMed 316L SSs.
研究成果
The as-received SLMed 316L SS exhibited the lowest passive current density due to high sub-grain boundary density and micro-galvanic effects, leading to rapid formation of a thick protective layer. The SA SLMed 316L SS showed poor passivation and re-passivation abilities due to precipitated nanosized oxide and sulfide particles. SA treatment was not favorable for improving corrosion resistance, especially pitting corrosion resistance.
研究不足
The study focused on the passive film properties in a mild alkaline environment. Long-term experiments are needed to evaluate the durability of the as-received SLMed 316L SS. The AES results provide an average and approximate passive film thickness, which may not strictly uniform.
1：Experimental Design and Method Selection:
The study involved anodic polarizations at various passive film formation potentials on SLMed 316L SS in a borate buffer solution for 12 h to generate steady-state passive films. Microstructures were characterized by FE-SEM, EBSD, and TEM. Electrochemical properties were investigated using potentiodynamic and cyclic potentiodynamic polarization analyses, EIS, Mott–Schottky experiments, AES, and SKPFM measurements.
2：Sample Selection and Data Sources:
The 316L SS powder used for SLM was prepared by high-purity argon gas atomization. A SLMed 316L SS with a relative porosity of less than 0.03 vol% was produced by EOS M290 equipment.
3：03 vol% was produced by EOS M290 equipment.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included EOS M290 for SLM, FE-SEM, EBSD, TEM, SKPFM, and AES. Materials included 316L SS powder and borate buffer solution.
4：Experimental Procedures and Operational Workflow:
Samples were polished, ultrasonically cleaned, and cathodically polarized before electrochemical measurements. Potentiostatic polarization under different passive film formation potentials was performed for 12 h.
5：Data Analysis Methods:
Data were analyzed using Mott–Schottky theory, EIS fitting, and AES for passive film thickness estimation.
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