Work

Development of Environment‐Time‐Dependent Material Selection Maps for Alloy 718 Under Crevice Conditions in Aerated Seawater

Year: 2025

Type: article

Abstract: ABSTRACT Material selection practices and standards that rely on the so‐called pitting corrosion resistance equivalent (PRE) might be both risky and over‐conservative. This paper introduces material selection maps, that is, charts indicating crevice corrosion resistance as a function of temperature and electrochemical potential, illustrating their applicability using nickel‐based alloy 718 as a case study. The results showed that alloy 718 could sustain crevice corrosion at temperatures as low as 10°C and 100 mVSSC for 30 days. The most extensive crevice attack was observed at 20°C and 200 mVSSC. Microstructure precipitates were found to cause preferential dissolution of the surrounding matrix. The crevice corrosion susceptibility maps developed in this study represent a new approach that demonstrates how environmental parameters can be used to determine the material suitability under certain conditions.

Source: Materials and Corrosion

DOI: 10.1002/maco.202414748

Authors: Ahmed Reyad, Thaneshan Sapanathan, Edgar Hornus, Mariano Ianuzzi

Institutions: Curtin University, Alcoa (Australia)

Language: English

Topic: Hydrogen embrittlement and corrosion behaviors in metals

Subfield: Metals and Alloys

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,540

Funder: Chevron Australia