Pitting Resistance Study after the Laser Forming of AISI 304 Stainless Steel and its Remediation Methods of Chemical Pickling and Laser Ablation Processes
Author
Giannas, Anastasia
Term
4. semester
Education
Publication year
2024
Abstract
This study compared two remediation treatments—chemical pickling and laser ablation—for removing the oxide layer that forms on AISI 304 stainless steel at high temperatures (such as during welding or laser processing), with the goal of reducing pitting corrosion (small, localized holes). The work included both base material and laser-formed samples. Removing this oxide is often necessary to preserve material quality, especially when maintaining manufacturing equipment. To assess pitting resistance, the team used a ferric chloride pitting test, cyclic potentiodynamic polarization (CPP) with a newly proposed way of conducting the measurements, and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX). Mass loss and surface structures were also evaluated. Because the data were highly scattered, the conclusions are uncertain. However, the correlation between mass loss and pitting resistance suggested that corrosion deterioration in both treated groups was greater than in the untreated base or laser-formed samples.
Dette studie sammenlignede to efterbehandlinger – kemisk syrebejdse og laserablation – for at fjerne det oxidlag, der dannes på AISI 304 rustfrit stål ved høj temperatur (fx ved svejsning eller laser), med målet om at begrænse punktkorrosion (små, lokale korrosionshuller). Undersøgelsen omfattede både basisprøver og laserformede prøver. At fjerne oxidlaget er ofte nødvendigt for at bevare materialets kvalitet, især i vedligeholdelse af produktionsudstyr. For at vurdere modstand mod punktkorrosion blev der anvendt ferrichlorid-grubekorrosionstest, cyklisk potentiodynamisk polarisering (med en ny fremgangsmåde for målingerne) samt scanning-elektronmikroskopi (SEM) med energidispersiv røntgen (EDX). Derudover blev massetab og overfladestruktur vurderet. Data var præget af stor spredning, så resultaterne er usikre. Ikke desto mindre indikerede sammenhængen mellem massetab og punktkorrosionsmodstand, at korrosionsnedbrydningen i begge grupper med efterbehandling var større end i de ubehandlede basis- eller laserformede prøver.
[This apstract has been rewritten with the help of AI based on the project's original abstract]
Keywords