Crevice Corrosion Behaviors Between CFRP and Stainless Steel 316L for Automotive Applications

Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications. The existence of crevices will result in galvanic corrosion and crevice corros...

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Bibliographic Details
Published inActa metallurgica sinica : English letters Vol. 32; no. 10; pp. 1219 - 1226
Main Authors Wu, Xia-Yu, Sun, Jia-Kun, Wang, Jia-Ming, Jiang, Yi-Ming, Li, Jin
Format Journal Article
LanguageEnglish
Published Beijing The Chinese Society for Metals 01.10.2019
Springer Nature B.V
Subjects
Austenitic stainless steels
Carbon
Carbon fiber reinforced plastics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion mechanisms
Corrosion potential
Corrosion rate
Corrosion tests
Crevice corrosion
Design
Electrodes
Epoxy resins
Galvanic corrosion
Materials Science
Mechanical properties
Metallic Materials
Morphology
Nanotechnology
Organometallic Chemistry
Pitting (corrosion)
Spectroscopy/Spectrometry
Stainless steel
Tribology
Galvanic system
316L stainless steels
Crevice corrosion
Carbon fiber reinforced plastics
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Summary:Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications. The existence of crevices will result in galvanic corrosion and crevice corrosion when CFRPs and 316L are directly connected. A crevice former for the galvanic system was therefore designed and applied to evaluate the crevice corrosion behaviors and study the mechanism of galvanic crevice corrosion through several electrochemical techniques in this research. The results showed that the crevice corrosion of galvanic systems grew from crevice mouth to the inside crevice and could be divided into four steps, metastable pitting corrosion at the crevice mouth, initiating step of crevice corrosion, propagating step and ending step of crevice corrosion. Because of the influences of the galvanic system, electrode reaction rates were speeded up and the passivation region was shortened at the initiating stage of crevice corrosion. Corrosion rate was observed to be higher in the galvanic system than that in normal crevice systems.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-019-00909-z