Passivation Treatment of Electro-polished Type 304 Stainless Steel in Environmentally Friendly Organic Acid Solutions

Electrolyte additives, applied voltage, and wiping speed were investigated to elucidate the optimum conditions for electropolishing of stainless steel (SUS304) using a wiping method with an electrolyte-solution-impregnated felt wiper cathode. Adding a viscosity improver and a surfactant to the electrolyte solution (mixed acid of 98% sulfuric acid and 85% phosphoric acid (1 : 3, v/v) ) reduced the evolution of pits on the electropolished SUS304 surfaces caused by the wiping method, but it reduced the polishing rate. Conditions of higher applied voltage and lower wiping speed led to an increased polishing rate and decreased pit evolution on the SUS304 surface. Electropolishing by the wiping method using the electrolyte containing the viscosity improver and 8 V of applied voltage and 10 mm s -1 wiping speed produced extremely smooth and high-gloss surfaces. Analysis by glow discharge optical emission spectroscopy revealed that the depth profile of the surface composition had a Cr-rich layer formed on the electropolished SUS304 surface by the wiping method. The pitting potential of SUS304 surface shifted to a more positive value after electropolishing using the wiping method. That value was comparable to that obtained after conventional electropolishing.

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リン酸－硫酸系電解液を用いた払拭法によるsus304ステンレス鋼の電解研磨条件の検討

Fujino

Fukumuro

Ida

et al. 2021

Journal of the Surface Finishing Society of Japan

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イソプロピルアルコール中での電解研磨sus316lステンレス鋼の局部腐食とその防止のための表面処理法

ISHIMI,

FUJINO,

IDA

et al. 2023

Journal of the Surface Finishing Society of Japan

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This study developed surface finishing methods to prevent corrosion of electropolished SUS316L stainless steel in isopropyl alcohol (IPA) . For this development, immersion corrosion tests in 99.7% IPA and anodic polarization tests in 0.15 kmol･m -3 HCl were conducted using electropolished SUS316L specimens passivated with 30% HNO 3 , 0.1 kmol･m -3 Na 2 MoO 4 -containing 30% HNO 3 , 3.5% H 2 O 2 and 0.98% H 2 O 2containing 8% citric acid. Identical tests were also applied to specimens heated to 200-450 ℃ after passivation treatments. Corrosion morphologies of these specimens in 99.7% IPA exhibited pitting. Pit densities and corrosion rates of these specimens in 99.7% IPA showed good correlation with pitting potentials in 0.15 kmol･m -3 HCl. Judging from the obtained values of pit densities and pitting potentials, specimens passivated with 30% HNO 3 or 0.1 kmol･m -3 Na 2 MoO 4 -containing 30% HNO 3 showed very good corrosion resistance against IPA corrosion. Heat-treatment at 200 ℃ after surface finishing using 30% HNO 3 and 0.1 kmol･m -3 Na 2 MoO 4 -containing 30% HNO 3 increased corrosion resistance against IPA. However, heat-treatment at temperatures higher than 350 ℃ decreased the corrosion resistance.

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Passivation Treatment of Electro-polished Type 304 Stainless Steel in Environmentally Friendly Organic Acid Solutions

Cited by 2 publications

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リン酸－硫酸系電解液を用いた払拭法によるsus304ステンレス鋼の電解研磨条件の検討

リン酸－硫酸系電解液を用いた払拭法によるsus304ステンレス鋼の電解研磨条件の検討

イソプロピルアルコール中での電解研磨sus316lステンレス鋼の局部腐食とその防止のための表面処理法

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