# Uniform formation of Ti-based conversion coatings on aluminum alloy surfaces by alkaline-acid etch treatment to improve organic coating properties

https://mdr.nims.go.jp/datasets/4c01e274-398c-4554-a021-aba76f895508

## File

- [Revised Manuscripts_240321.docx](https://mdr.nims.go.jp/filesets/067b51c6-0b5f-4bd0-920e-f0071b580269/download) ([Detail](https://mdr.nims.go.jp/filesets/067b51c6-0b5f-4bd0-920e-f0071b580269.md))

## Id

4c01e274-398c-4554-a021-aba76f895508

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-10-05T05:44:24.609335Z

## Updated at

2025-01-06T00:32:43.315696Z

## Published at

2026-03-27T23:22:12.891786Z

## Doi

https://doi.org/10.48505/nims.5235

## First published url

https://doi.org/10.1016/j.apsusc.2024.160005

## Date published

2024-03-28

## Recorded date published

2024-7

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Uniform formation of Ti-based conversion coatings on aluminum alloy surfaces
    by alkaline-acid etch treatment to improve organic coating properties
  title_type: original
  lang: en

## Description

- description: Environmentally friendly chromium-free Ti-/Zr-based conversion coatings
    are used as a pretreatment for organic coatings applied to aluminum alloys to
    replace conventional chromate conversion coatings. Chemical cleaning of alloy
    surfaces with alkalis and acids prior to conversion treatment is known to improve
    the corrosion resistance and adhesion of organic coatings. In recent years, there
    have been many attempts to optimize the acid treatment, for example, by adding
    HF to the acid to improve the etching performance. In this study, the microstructure
    formed during acid treatment with and without HF was analyzed in detail to investigate
    its effect on the adhesion property of organic coatings. Ti-based conversion coatings
    were formed on A3003 alloy after chemical cleaning with NaOH followed by H2SO4
    or HF-containing H2SO4. Cleaning with HF-containing H2SO4 resulted in the formation
    of an F-rich layer on the alloy surface and the reprecipitation of dealloyed Cu.
    Subsequent Ti-based conversion treatment enriched the F-rich layer and formed
    Cu-containing Ti-oxide aggregates, which reduced the adhesion of organic coatings.
    Impact adhesion and salt spray corrosion resistance were comparable to those of
    chromate conversion coatings when Ti-based conversion coatings were formed uniformly
    under optimum conditions after acid treatment without HF.
  description_type: abstract
  lang: und

## Creator

- name: N. Banjo
  role: author
- name: T.T. Sasaki
  role: author
  orcid: https://orcid.org/0000-0002-5952-7638
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: K. Hono
  role: author
  orcid: https://orcid.org/0000-0001-7367-0193
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: A3003 aluminum alloy
  schema: not_defined
- subject: Hydrogen fluoride
  schema: not_defined
- subject: Ti-based conversion coatings
  schema: not_defined
- subject: Chemical cleaning
  schema: not_defined
- subject: Acid etching
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-03-28
end_date: 2026-03-29

## Journal

- title: Applied Surface Science
  issn: '01694332'
  volume: '661'
  article_number: '160005'

## Conference



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 067b51c6-0b5f-4bd0-920e-f0071b580269
  filename: Revised Manuscripts_240321.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 9284138
  md5: 47b5a8d029e29f9d681eb5a0a9459141

## Thumbnail

fileset_id: 067b51c6-0b5f-4bd0-920e-f0071b580269
filename: Revised Manuscripts_240321.docx