What is the effect of phosphoric acid and perchloric acid on the electropolishing of additive manufactured 17-4PH stainless steel?

Label:chem

Topic
Additive manufactured 17-4PH stainless steel is known for its high wear resistance, good corrosion resistance, good mechanical properties, and high yield strength. However, the additive manufacturing process often results in a rough surface due to the deposition of powder particles on the molten surface. This roughness can lead to stress concentration and crack initiation, reducing the fatigue performance of the material. Electropolishing is an electrochemical method used to smooth and level the surface of metals by applying an external voltage.

From: "Effect of phosphoric acid and perchloric acid on Electropolishing of additive manufactured 17-4 PH stainless steel and its characterization",
International Journal of Electrochemical Science, Volume 17, Issue 3, March 2022, 220315
Answer
Electropolishing using phosphoric acid and perchloric acid significantly reduces the surface roughness of additive manufactured 17-4PH stainless steel. The surface morphology of the untreated sample is characterized by spherical particles, which are reduced in size and number after electropolishing. The surface roughness decreases from an initial value of 11.69 μm to 1.76 μm after 10 minutes of electropolishing with perchloric acid. Additionally, electropolishing increases the hardness and corrosion resistance of the material. The absolute impedance at low frequency (0.01 Hz) for electropolishing using perchloric acid for 10 minutes is 10 times that of the untreated sample, indicating enhanced corrosion resistance.
Return to Home Chemical List
Knowledge you may be interested in
How do sulfate and nitrate impurities affect the voltammetric response of Pt(111) in HClO₄ solutions? What is the origin of the reduction peaks observed at 0.32 V and 0.5 V in the CV of Pt(111) in high-concentration HClO₄ electrolyte? What is the effect of trace impurities in perchloric acid on the blank voltammetry of Pt(111)? What are the potential applications of the plasticized β-stannic acid-perchloric acid compound? What are the electrochemical properties of the plasticized β-stannic acid samples? What is the structural model proposed for the interaction between β-stannic acid and perchloric acid? How does the addition of perchloric acid affect the proton conductivity of β-stannic acid? What is the role of perchloric acid in the plasticization of β-stannic acid powders? How effective is beta-Cyclodextrin in trapping different types of gases, and what are the implications for applications in food, environmental protection, and fuel storage? What are the major factors governing the formation of inclusion complexes between β-cyclodextrin (β-CD) and gaseous substances? How does the surface morphology of additive manufactured 17-4PH stainless steel change after electropolishing with phosphoric acid and perchloric acid? What is the impact of electropolishing on the hardness and corrosion resistance of additive manufactured 17-4PH stainless steel? What is the significance of pH variability in the prebiotic synthesis of cyclic dipeptides on early Earth? How does the addition of trimetaphosphate (P3m) influence the synthesis of cyclic dipeptides from prolinamide? What role do clay minerals and metal ions play in the prebiotic synthesis of cyclic dipeptides? Can prolinamide react with other amino acids to form heterocyclic dipeptides under simulated early Earth conditions? What are the reaction pathways of arylamines with selenium dioxide (SeO₂) in acetonitrile? How does the presence of an electron-donating group (e.g., methoxy) affect the reaction of arylamines with SeO₂? How does the presence of an electron-withdrawing group (e.g., carboxylate) affect the reaction of arylamines with SeO₂? What is the role of solvent oxidation in the reaction of arylamines with SeO₂?