Stainless steel in coastal seawater: sunlight counteracts biologically enhanced cathodic kinetics
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Stainless steel in coastal seawater: sunlight
counteracts biologically enhanced cathodic kinetics
|
|
| Creator |
Eashwar, M.
Lakshman Kumara, A. Sreedharb, G. Kennedy, J. Sureshbapu, R.H. |
|
| Subject |
Electrobiology
|
|
| Description |
The influence of sunlight of varying intensity on the performance of UNS S30400 stainless steel (SS) was explored
under conditions of natural biofilm development in coastal seawater. In a series of tests performed outdoors under an
opaque roof, a range of shades were fashioned to impart varied amounts of diurnal light. These were an ambient level
where the underwater illumination was ~ 5% of full sunlight, two intermediate ranges of lighting with ~ 2.5% and ~ 1%
of the daylight, and a condition of full darkness. In comparison with the dark, increments of sunlight rendered the SS
progressively less aggressive as cathodes in galvanic couples with UNS C70600 alloy. Likewise, welded SS with pre-initiated
localized corrosion sites exhibited substantially lower rates of propagation with light. Thus, biofilms and sunlight
affected cathodic kinetics in opposite ways. Surface analytical tests showed that the accumulation of manganese (Mn)
within the biofilms was small relative to reports from waters of lower salinity. These results not only reveal that extremely
low amounts of sunlight are adequate to offset the microbial effect, but also highlight the lack of convincing evidence
for Mn cycling as a potent mechanism for enhanced cathodic kinetics in full-strength seawater
|
|
| Publisher |
Taylor & Francis
|
|
| Date |
2014
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cecri.csircentral.net/3096/1/035-2014.pdf
Eashwar, M. and Lakshman Kumara, A. and Sreedharb, G. and Kennedy, J. and Sureshbapu, R.H. (2014) Stainless steel in coastal seawater: sunlight counteracts biologically enhanced cathodic kinetics. Biofouling, 30 (8). pp. 929-939. ISSN 0892-7014 |
|
| Relation |
http://www.tandfonline.com/loi/gbif20
http://cecri.csircentral.net/3096/ |
|