Publication detail

The Corrosion Resistance of Hard Anodised EN AW 7075 T6 Alloy

KUSMIČ, D. KLAKURKOVÁ, L. JULIŠ, M. GEJDOŠ, P. VILIŠ, J. ČECH, O.

Original Title

The Corrosion Resistance of Hard Anodised EN AW 7075 T6 Alloy

Type

conference paper

Language

English

Original Abstract

In this paper, commercially cold-rolled and artificial aged EN AW 7075 T6 alloy has been used. To ensure increased corrosion resistance, surface hardness, scratching resistance, and aesthetic features, this aluminium alloy was subsequently hard anodised and hot-water sealed (AC-A). The hard anodizing and sealing process increased surface hardness up to 304 13 HV 1 from an initial surface hardness of 194 3 HV 1. Also, the microhardness of the anodised layer and bulk material has been documented. Scanning electron microscopy (SEM) was used for microstructure and trapped precipitates investigation in the 42.9 1.4 thick formed anodised layer investigation. The T6 treated (AC) and hard anodised together with sealed (AC-A) EN AW 7075 alloy corrosion properties were evaluated using the anodic potentiodynamic polarisation tests (PPT) in a neutral 2.5% NaCl deaerated solution. The corrosion rate CR (mm/y) decreased approx. 39-times for the hard anodised and sealed EN AW 7075 alloy (AC-A), associated with the shift of the E corr (mV) to more positive values, degreased Icorr (µA) and increased Rp (Ohm) values compared to the artificial aged (AC) alloy. Additionally, the pitting was evaluated using laser confocal microscopy, and the pitting coefficient was also calculated.

Keywords

corrosion resistance; 7075-T6; aluminum corrosion

Authors

KUSMIČ, D.; KLAKURKOVÁ, L.; JULIŠ, M.; GEJDOŠ, P.; VILIŠ, J.; ČECH, O.

Released

22. 8. 2021

Publisher

Electrochemical Society

ISBN

9781607685395

Book

ECS Transactions

Edition

105

Edition number

1

ISBN

1938-6737

Periodical

ECS Transaction

Year of study

105

Number

1

State

United States of America

Pages from

329

Pages to

337

Pages count

9

URL

https://iopscience.iop.org/article/10.1149/10501.0329ecst

Full text in the Digital Library

http://hdl.handle.net/11012/203542

BibTex

@inproceedings{BUT176135,
  author="KUSMIČ, D. and KLAKURKOVÁ, L. and JULIŠ, M. and GEJDOŠ, P. and VILIŠ, J. and ČECH, O.",
  title="The Corrosion Resistance of Hard Anodised EN AW 7075 T6 Alloy",
  booktitle="ECS Transactions",
  year="2021",
  series="105",
  journal="ECS Transaction",
  volume="105",
  number="1",
  pages="329--337",
  publisher="Electrochemical Society",
  doi="10.1149/10501.0329ecst",
  isbn="9781607685395",
  issn="1938-6737",
  url="https://iopscience.iop.org/article/10.1149/10501.0329ecst"
}