# Corrosion Inhibition of Nickel Achieved by Phosphate Addition into Chloride-Rich Media toward Seawater Electrolysis

https://mdr.nims.go.jp/datasets/8eb0b420-1422-44a0-ac76-d2cb89e8779a

## File

- [20250813_Revised_Manuscript.docx](https://mdr.nims.go.jp/filesets/6f6dadf0-cf51-4537-a08a-42779cca24e7/download) ([Detail](https://mdr.nims.go.jp/filesets/6f6dadf0-cf51-4537-a08a-42779cca24e7.md))

## Id

8eb0b420-1422-44a0-ac76-d2cb89e8779a

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-27T07:18:48.514477Z

## Updated at

2025-09-05T23:30:17.521795Z

## Published at

2025-09-05T23:19:26.395624Z

## Doi

https://doi.org/10.48505/nims.5733

## First published url

https://doi.org/10.1021/acs.jpcc.5c04712

## Date published

2025-09-04

## Recorded date published

2025-9-4

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Corrosion Inhibition of Nickel Achieved by Phosphate Addition into Chloride-Rich
    Media toward Seawater Electrolysis
  title_type: original
  lang: en

## Description

- description: 'Ni-based materials are promising candidates for anodic electrodes
    and electrolysis cell materials in seawater electrolysis systems for hydrogen
    production. However, their practical application is hindered by severe corrosion
    in chloride-rich electrolytes. Incorporating phosphate into the electrolyte has
    emerged as an effective strategy to enhance corrosion resistance, though the underlying
    mechanisms remain poorly understood. In this study, the corrosion inhibition mechanism
    of phosphate on Ni was systematically investigated. Polarization measurements
    in 0.5 M borate – 0.5 M KCl electrolytes at pH 9.2 with varying phosphate concentrations
    revealed that Ni undergoes pitting corrosion with Cl−, which is significantly
    mitigated by phosphate addition. This enhancement is attributed to two factors:
    1) structural modification of the passive film, and 2) suppression of pit propagation.
    STEM/EDS analysis shows phosphate incorporation into the Ni passive film, altering
    its structure from crystalline to amorphous, which correlates with enhanced protective
    ability of passive film. Furthermore, potentiostatic polarization reveals that
    phosphate addition inhibits pit propagation even after its initiation. This inhibition
    is likely due to the pH buffering effect of phosphate. These findings offer new
    mechanistic insights into phosphate-assisted corrosion resistance enhancement
    and provide a foundation for the design of corrosion-resistant nickel-based materials
    for highly-concentrated chloride environments.'
  description_type: abstract
  lang: eng

## Creator

- name: Mariko Kadowaki
  role: author
  orcid: https://orcid.org/0000-0002-8988-3545
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Evaluation Field/Corrosion
    Research Group
- name: Taku Moronaga
  role: author
  orcid: https://orcid.org/0000-0002-6915-0627
  organization: National Institute for Materials Science
  department: Research Network and Facility Services Division/Materials Fabrication
    and Analysis Platform/Electron Microscopy Unit
- name: Akiko Nakamura
  role: author
  organization: National Institute for Materials Science
  department: Research Network and Facility Services Division/Materials Fabrication
    and Analysis Platform/Electron Microscopy Unit
- name: Yoshiharu Murase
  role: author
  orcid: https://orcid.org/0000-0001-7390-851X
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Evaluation Field/Corrosion
    Research Group
- name: Tomoya Hashimoto
  role: author
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Evaluation Field/Corrosion
    Research Group
- name: Hideki Katayama
  role: author
  orcid: https://orcid.org/0000-0001-7947-4687
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Evaluation Field/Corrosion
    Research Group
- name: Kazuhiro Takanabe
  role: author
  organization: The University of Tokyo
  department: Department of Chemical System Engineering, School of Engineering
- name: Yusuke Tsutsumi
  role: author
  orcid: https://orcid.org/0000-0002-9483-1256
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Evaluation Field/Corrosion
    Research Group

## Contact agent



## Publisher

organization: ACS Publications

## Managing organization



## Keyword

- subject: corrosion
  schema: not_defined
- subject: Nickel
  schema: not_defined
- subject: phosphate
  schema: not_defined
- subject: passive film
  schema: not_defined
- subject: waterelectrolysis
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: The Journal of Physical Chemistry C
  volume: '129'
  issue: '35'
  start_page: 15939
  end_page: 15948

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## Fileset

- id: 6f6dadf0-cf51-4537-a08a-42779cca24e7
  filename: 20250813_Revised_Manuscript.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 25336534
  md5: 487feb6315904cee6d58b5fc4c2b5fa9

## Thumbnail

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filename: 20250813_Revised_Manuscript.docx