Effect Of The PH Value Of The Hydrogenation Solution Upon The Phase ...

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Effect of the pH value of the hydrogenation solution upon the phase transformation of nickel into nickel hydrideinfo

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keyboard_arrow_downkeyboard_arrow_upMilko MonevMilko MonevMilko Monev

2001, Electrochimica Acta

https://doi.org/10.1016/S0013-4686(01)00438-8downloadDownload PDFdescriptionSee full PDFvisibility

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Abstract

The effect of pH value of the hydrogenation solution, containing H 2 SeO 3 as a hydrogenation-enhancing additive upon the phase transformation of nickel into b-nickel hydride in electrodeposited bright nickel coatings during cathodic charging was studied using X-ray diffraction. The nickel hydride formation terminates at pH value over 2.1. At this pH value in the bulk of hydrogenation solution, the pH value within the layer in the vicinity of the nickel electrode shift during the cathodic process to the alkaline region as a result of hydrogen evolution. An indication of the alkalization is the shift of the nickel electrode potential towards more negative values ( − 1.3 V NHE) within the range of pH values where phase transformation terminates. The hydrogenation enhancing effect of H 2 SeO 3 appears to occur when the deposition of selenium on nickel surface begins. Strong hydrogenation of samples with co-deposited selenium proceeds during cathodic polarization in an acidic medium without an enhancing additive.

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Key takeaways

AI generated

1. Nickel transforms into b-nickel hydride at pH values below 2.1 during cathodic polarization.
2. Hydrogenation enhancement by H2SeO3 occurs when selenium deposition begins on nickel surface.
3. Maximum hydrogen solubility in steel occurs around pH 2, reducing at higher pH.
4. X-ray diffraction confirms phase transformation and potential shifts indicate alkalization during charging.
5. Understanding pH's role in hydrogen evolution reactions is critical for optimizing electrochemical processes.

FAQ's

AI generated

What is the effect of pH on nickel hydride formation during hydrogenation?add

The study reveals that nickel transforms into b-nickel hydride at pH values up to 2.0, with phase transformation ceasing at pH 2.1, attributed to hydrogen evolution alkalizing the electrode layer.

How does the presence of H2SeO3 influence pH-dependent hydrogenation?add

H2SeO3 enhances hydrogenation in acidic solutions, but shows a termination of nickel hydride formation beyond pH 2.1, as it requires conditions promoting H2Se formation.

What happens to hydrogen solubility in steel at varying pH levels?add

Hydrogen solubility in steel peaks at a pH of about 2, decreasing significantly above pH 3.0, indicating a correlation with the activity of hydronium ions.

What observations were made regarding the electrochemical reduction of H2SeO3?add

During cathodic polarization, H2SeO3 transforms, resulting in selenium deposition on nickel surfaces, influencing subsequent hydrogenation behavior.

What implications does pH have for nickel coatings during cathodic polarization?add

The study indicates that alterations in potential and internal stresses in nickel coatings during polarization relate to pH, especially with co-deposited additives affecting hydrogenation.

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