Abstract
Corrosion is an electrochemical phenomenon. It can occur via different modes of attack, each having its own mechanisms, and therefore there are multiple metrics for evaluating corrosion resistance. In corrosion resistant alloys (CRAs), the rate of localized corrosion can exceed that of uniform corrosion by orders of magnitude. Therefore, instead of uniform corrosion rate, more complex electrochemical parameters are required to capture the salient features of corrosion phenomena. Here, we collect a database with an emphasis on metrics related to localized corrosion. The six sections of the database include data on various metal alloys with measurements of (1) pitting potential, Epit, (2) repassivation potential, Erp, (3) crevice corrosion potential, Ecrev, (4) pitting temperature, Tpit, (5) crevice corrosion temperature, Tcrev, and (6) corrosion potential, Ecorr, corrosion current density, icorr, passivation current density, ipass, and corrosion rate. The experimental data were collected from 85 publications and include Al- and Fe-based alloys, high entropy alloys (HEAs), and a Ni-Cr-Mo ternary system. This dataset could be used in the design of highly corrosion resistant alloys.
Highlights
Background & SummaryCorrosion of metallic structures has a substantial impact on the economy
A 1998 study estimates the direct cost of corrosion to be 276 billion USD each year in the U.S alone, or about three percent of the gross domestic product (GDP)[1,2,3]
For metals that undergo uniform corrosion, the corrosion rate can often be obtained by mass loss measurements as a function of exposure time to a corrosive environment or by electrochemical measurements
Summary
Corrosion of metallic structures has a substantial impact on the economy. A 1998 study estimates the direct cost of corrosion to be 276 billion USD each year in the U.S alone, or about three percent of the gross domestic product (GDP)[1,2,3]. When the applied potential is more noble than a specific range of values, the passive film breaks down and stable pits form, a process accompanied by a rapid increase of the current density This characteristic potential is defined as Epit, which has been broadly used to determine the tendency of a given metal or alloy to breakdown. This database allows us to link the corrosion resistance of CRAs to various experimental parameters, including materials composition and environmental attributes (temperature, pH, and chloride ion concentration), and enables the development of calculable matrices that could shed light on the fundamental physical processes that govern the corrosion performance. Development of corrosion databases such as this may be crucial for the future of alloy design and optimization
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