Open AccessThe monitoring of pitting corrosion in stainless steel in the simulated corrosive conditions of marine applications
Author(s) -
Thee Chowwathapunya
Publication year - 2019
Publication title -
maritime technology and research
Language(s) - English
Resource type - Journals
ISSN - 2651-205X
DOI - 10.33175/mtr.2019.146185
Subject(s) - corrosion , metallurgy , materials science , pitting corrosion , austenitic stainless steel , austenite , immersion (mathematics) , intergranular corrosion , microstructure , mathematics , pure mathematics
This paper describes the monitoring of pitting corrosion in ferritic and austenitic stainless steel under the simulated acidic conditions of marine applications. The monitoring dealt with corrosion weight loss and metallurgical investigation. The results indicated that stainless steel with passive film shows good corrosion resistance to the simulated corrosive environment for all test periods. In contrast, stainless steel without passive film cannot provide an inhibiting effect for the whole test period. After 24 h. of testing, both of the stainless steels were locally attacked. Pitting corrosion was observed on the surface of both stainless steels. In small pits, self-accelerating corrosion can occur. Therefore, longer immersion times were attributed to the higher corrosion rates of both stainless steel in simulated acidic conditions.