Menu
Search
Filters
Close
Menu

Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!

Novel Heat-Conducting “Metallic” Coatings Against Biofouling And Biocorrosion

Novel antimicrobial heat-conducting “metallic” coatings against biofouling and biocorrosion
Available for download

Seawater biofouling is a major threat in heat exchanger operations. It decreases the heat transfer efficiency and service life of heat exchangers1,2. The formation of deposits caused by biofouling on the heat exchanger metal surfaces increases surface roughness and decreases cross-sectional flow area, which leads to higher friction loss in fluid flow3,4. Mitigation methods, including surface scrubbing, fluidizing bed heat exchangers, cleaning-in-place and dosing anti-fouling chemicals, are the main ways to tackle biofouling5. Conventional approaches to treat biofouled components by periodic electrochlorination or acid flushes are costly and environmentally hazardous. Huge costs are associated with heat exchanger biofouling losses, but there is still a lack of research to develop heat-conducting antifouling coatings to heat exchangers3.

Product Number: 51322-18178-SG
Author: Di Wang, Timothy D. Hall, Tingyue Gu
Publication Date: 2022
Industries: Science of Corrosion , Corrosion Monitoring and Control , Coatings
$0.00
$20.00
$20.00

NiMo and NiMo with embedded CeO2 nanoparticles (100 nm) were tested as antimicrobial coatings (~15 µm thickness) on Ti (titanium) surfaces using an electrochemical process for heat exchanger applications onboard marine vessels. Preliminary static biofouling and biocorrosion (also known as microbiologically influenced corrosion) assessments were carried out in glass bottles using pure-strain Desulfovibrio vulgaris, a sulfate reducing bacterium (SRB), in deoxygenated ATCC 1249 medium at 37oC, and using an alga (Chlorella vulgaris) mixed with general heterotrophic bacteria (GHB) in enriched artificial seawater at 28oC. It was found that NiMo/CeO2 was much more effective than NiMo in preventing SRB biofilm formation with an efficacy of 99% reduction in D. vulgaris sessile cells after 21-day incubation. The NiMo/CeO2 coating also exhibited a 50% lower corrosion current density compared to the uncoated Ti against SRB corrosion. Both NiMo and NiMo/CeO2 coatings achieved 99% reduction in sessile algal cells. Confocal laser scanning microscopy (CLSM) biofilm images indicated a large reduction of sessile GHB cells. The CLSM images also confirmed the biocidal kill effects of the two coatings. Unlike polymer coatings, the “metallic” costings are heat conductive. Thus, the corrosion resistant antifouling coatings are suitable for heat exchanger applications. 

NiMo and NiMo with embedded CeO2 nanoparticles (100 nm) were tested as antimicrobial coatings (~15 µm thickness) on Ti (titanium) surfaces using an electrochemical process for heat exchanger applications onboard marine vessels. Preliminary static biofouling and biocorrosion (also known as microbiologically influenced corrosion) assessments were carried out in glass bottles using pure-strain Desulfovibrio vulgaris, a sulfate reducing bacterium (SRB), in deoxygenated ATCC 1249 medium at 37oC, and using an alga (Chlorella vulgaris) mixed with general heterotrophic bacteria (GHB) in enriched artificial seawater at 28oC. It was found that NiMo/CeO2 was much more effective than NiMo in preventing SRB biofilm formation with an efficacy of 99% reduction in D. vulgaris sessile cells after 21-day incubation. The NiMo/CeO2 coating also exhibited a 50% lower corrosion current density compared to the uncoated Ti against SRB corrosion. Both NiMo and NiMo/CeO2 coatings achieved 99% reduction in sessile algal cells. Confocal laser scanning microscopy (CLSM) biofilm images indicated a large reduction of sessile GHB cells. The CLSM images also confirmed the biocidal kill effects of the two coatings. Unlike polymer coatings, the “metallic” costings are heat conductive. Thus, the corrosion resistant antifouling coatings are suitable for heat exchanger applications. 

Product tags
Also Purchased
Offshore Marine Corrosion Rates - A Case Study
Available for download

Offshore Marine Corrosion Rates - A Case Study

Product Number: 51322-17977-SG
Author: Alex Delwiche, Patrick Lydon
Publication Date: 2022
$20.00

In the UK a huge effort was made in the mid to late 2000’s to minimize carbon emissions and the country had seen a rapid increase in wind-turbine generators being installed onshore and increasingly in offshore waters, nearly 2000 were operating in September 2018 and many more are expected in the coming decades. 1 One operator took the challenge to install a number of wind-turbines in the southern sector of the North Sea, just off the coast of south east England. These wind-turbines are constructed using the monopile foundation type principle.
Novel Evaluation of the Failure of Coatings in a Marine Environment
Available for download

Novel Evaluation Of The Failure Of Coatings In A Marine Environment

Product Number: 51322-18033-SG
Author: James A. Ellor
Publication Date: 2022
$20.00

The author previously introduced a method to evaluate protective coatings using a novel segmented cell approach. (1)  Briefly, the technique intended to monitor natural current exchange between isolated segments, coated or uncoated, to supplement visual rankings of coating performance.  The goal was to predict failure earlier than might otherwise be visible or to distinguish between coatings that had a similar visual appearance at the end of the proscribed test period.  The experimental design also allowed for the instrumented segments, which act as sensors, to be prepared and coated as intended for a real-world industrial exposure, i.e., the metallic surfaces could be abrasive blasted and painted unlike thin-film, foil-like sensors also explored for similar purposes. 
Picture for Nickel Based Alloy Casting Failure In Potash Production Mill
Available for download

Nickel Based Alloy Casting Failure In Potash Production Mill

Product Number: 51322-17528-SG
Author: Bernard Peterson, Alireza Kohandehghan, Brian Wilson
Publication Date: 2022
$20.00

Potash is mined from deep underground deposits left by ancient inland seas or extracted from saltwater bodies. The typical composition of potash is 40% potassium chloride (KCl), 55% sodium chloride (NaCl) and 5% clay. About 95% of potash is used for fertilizer in agriculture; the remaining 5% is used in commercial and industrial products such as soap, water softeners, de-icers, drilling muds etc.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support