Effect of SeO2 on the morphology of electrodeposited manganese

Pérez‐Garibay, R.; Rojas-Montes, J. C.; Bello-Teodoro, S.; Flores-Álvarez, José Manuel

doi:10.1007/s10800-020-01489-y

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…Na2SO3 also enhanced the polarization effect at the cathode, facilitated the transformation of Mn crystals, suppressed the formation of dendritic Mn, promoted the transition of Mn coating from γ-Mn to α-Mn, improved the smoothness and refinement of the Mn coating, and enhanced the current efficiency 22,28 .…”

Section: Effect Of Na2so3 and H2seo3 Composite On The Electrolytic Re...mentioning

confidence: 98%

“…Sulfur dioxide (SO2) additives can produce denser and smoother deposits of metallic Mn but are challenged by low ACCEPTED MANUSCRIPT current density and environmental concern 17 . SeO2 has the problems of high selenide content in the product and harmful to human body [18][19][20][21] ,but can improve the current efficiency and reduce the energy consumption greatly, the SeO2 is still the mainstream additive in the electrolytic Mn industry 22 . However, when used at the minimum industrial dosage of 0.015 g/L SeO2 (equivalent to 0.0175 g/L selenious acid (H2SeO3)), despite high Mn purity, the current efficiency remains very low 23 .…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Research on the Use of Low-Selenium Additives in the Electrodeposition of Manganese Metal and Co-production of Electrolytic Manganese

SONG,

SHEN,

LIU

et al. 2024

Electrochemistry

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This study addresses the problems of low product purity, low current efficiency, and environmental pollution caused by the excessive use of selenium additives in the electrolytic manganese (Mn) industry. It investigates the effects of composite additives on reducing selenium (Se) usage while enhancing the quality and current efficiency of Mn products. The primary additive is an industrial minimum amount of selenious acid (H2SeO3), with sodium sulfite (Na2SO3) and sodium dodecyl sulfate (SDS) as auxiliary additives. This research explores their impact on the membrane electrowinning process.The results show that the use of composite additives significantly enhances cathodic polarization of the coating, thereby inhibiting the hydrogen evolution reaction (HER) and playing a crucial role in forming dense and smooth coatings. When Na2SO3 is utilized as an auxiliary additive, it achieves a higher current efficiency than SDS, resulting in better quality Mn deposition. With a composite additive ratio of H2SeO3 at 0.0175 g/L and Na2SO3 at 1.5 g/L, the cathodic and anodic current efficiencies reach 84.59% and 80.13%, respectively, with an acid increment of 23.88 g/L. Additionally, the voltage stands at 3.9 V, the cathodic energy consumption at 4498.02 kW h t -1 , and the anodic energy consumption at 3001.41 kW h t -1 . The Mn surface after electrolysis is smooth, with a metallic luster and uniform thickness, exhibiting α-type crystal morphology, while electrolytic manganese dioxide (EMD) appears as a powder, black in color, with uniform size and γ-type crystal morphology. Thus, the use of Na2SO3 effectively reduces Se content in composite additives, enhancing current efficiency and product quality, and provides theoretical guidance for the study of low-Se composite additives in the coelectrolysis process of EMD.

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Section: Effect Of Na2so3 and H2seo3 Composite On The Electrolytic Re...mentioning

confidence: 98%

Section: Accepted Manuscriptmentioning

confidence: 99%

Research on the Use of Low-Selenium Additives in the Electrodeposition of Manganese Metal and Co-production of Electrolytic Manganese

SONG,

SHEN,

LIU

et al. 2024

Electrochemistry

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“…The electrodeposition of Mn from the sulphate bath requires selenium compound additives, such as SeO 2 or H 2 SO 3 [12][13][14][15][16], to control the structure and morphology of manganese coatings. The expensive and toxic SeO 2 presents hazardous effects on the environment [9,[17][18][19][20], which is against the goals of green chemistry.…”

Section: Introductionmentioning

confidence: 99%

The Corrosion of Mn Coatings Electrodeposited from a Sulphate Bath with Te(VI) Additive and Influence of Phosphate Post-Treatment on Corrosion Resistance

Žmuidzinavičienė,

Griškonis,

Šulčius

2023

Coatings

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Manganese coatings are excellent for the cathodic protection of steel against corrosion. Although manganese is more electrochemically active than widely used protective coatings of zinc, the exceptional resistance of manganese coatings in neutral and basic media is determined by the film of insoluble corrosion products, which forms on the surface of manganese and greatly suppresses its further corrosion. It is known that the electrodeposition process of Mn coatings from sulphate electrolytes is positively affected by some additives of chalcogenide (S, Se and Te) compounds in the electrolyte. However, a more detailed study on the corrosion properties of Mn coatings electrodeposited from sulphate bath with Te(VI) additive is lacking. In this work, the measurements of free corrosion potential and potentiodynamic polarization in a neutral NaCl solution, as well as the corrosion resistance properties of obtained Mn coatings, were evaluated in a salt spray chamber. It was obtained that the best corrosion resistance was shown by Mn coatings, electrodeposited at the cathodic current density of 15 A⋅dm−2 and at higher temperatures (60 and 80 °C). Meanwhile, the corrosion resistance of phosphated Mn coatings, obtained from a room temperature bath, increased about 5 times and reached up to 1000 h until corrosion of the steel substrate occurred.

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Efficient and clean manganese electrowinning in an anion-exchange membrane electrolyzer by pulse current electrodeposition method

Lyu

Chen

et al. 2021

Journal of Cleaner Production

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Effect of SeO2 on the morphology of electrodeposited manganese

Cited by 6 publications

References 23 publications

Research on the Use of Low-Selenium Additives in the Electrodeposition of Manganese Metal and Co-production of Electrolytic Manganese

Research on the Use of Low-Selenium Additives in the Electrodeposition of Manganese Metal and Co-production of Electrolytic Manganese

The Corrosion of Mn Coatings Electrodeposited from a Sulphate Bath with Te(VI) Additive and Influence of Phosphate Post-Treatment on Corrosion Resistance

Efficient and clean manganese electrowinning in an anion-exchange membrane electrolyzer by pulse current electrodeposition method

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