Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

Repair Coatings for TSA

Picture for Repair Coatings for TSA
Available for download

Thermally sprayed aluminium (TSA) has successfully been used for corrosion protection for several decades. In this investigation different repair coatings have been studied with respect to performance when applied on both TSA and bare steel.

 

Product Number: 51317--9369-SG
ISBN: 9369 2017 CP
Author: Ole Knudsen
Publication Date: 2017
Industry: Coatings and Linings
$0.00
$20.00
$20.00

Thermally sprayed aluminium (TSA) has successfully been used for corrosion protection for several decades. Coating lifetimes of 30 years in corrosive marine atmosphere has been documented. However it has also been found that coating TSA with thick protective organic coatings will result in rapid corrosion of the TSA and very short lifetimes. The TSA under a protective coating corrodes in a crevice corrosion like mechanism. Corrosion of the TSA under the paint film results in formation of aluminium chloride which hydrolyze and acidify the electrolyte. The acidification destabilizes the protective aluminium oxide and corrosion of the TSA accelerates.The problem is avoided by not covering TSA with thick organic coatings. However in some situations it is difficult to avoid coating the TSA. E.g. when repairing damages in the TSA in the field the repair coating often overlaps with the TSA around. Hence a repair coating that can protect steel but not trigger the crevice corrosion mechanism when applied on the TSA is needed.In this investigation different repair coatings have been studied with respect to performance when applied on both TSA and bare steel. Coatings have been selected based on three different hypotheses: (i) coatings that can buffer the low pH developed in the corrosion of TSA (ii) open coatings that can let the acidic environment be washed out and (iii) conductive coatings that can make electrochemical reactions take place outside the TSA/coating crevice. A number of coatings have been selected for testing with this in mind and tested in the ISO 20340 cyclic ageing test. The repair coatings were zinc rich primers of various types and silicate coatings with aluminium particles magnesium particles and magnesium oxide.

 Key words: TSA, repair coating, durability

Thermally sprayed aluminium (TSA) has successfully been used for corrosion protection for several decades. Coating lifetimes of 30 years in corrosive marine atmosphere has been documented. However it has also been found that coating TSA with thick protective organic coatings will result in rapid corrosion of the TSA and very short lifetimes. The TSA under a protective coating corrodes in a crevice corrosion like mechanism. Corrosion of the TSA under the paint film results in formation of aluminium chloride which hydrolyze and acidify the electrolyte. The acidification destabilizes the protective aluminium oxide and corrosion of the TSA accelerates.The problem is avoided by not covering TSA with thick organic coatings. However in some situations it is difficult to avoid coating the TSA. E.g. when repairing damages in the TSA in the field the repair coating often overlaps with the TSA around. Hence a repair coating that can protect steel but not trigger the crevice corrosion mechanism when applied on the TSA is needed.In this investigation different repair coatings have been studied with respect to performance when applied on both TSA and bare steel. Coatings have been selected based on three different hypotheses: (i) coatings that can buffer the low pH developed in the corrosion of TSA (ii) open coatings that can let the acidic environment be washed out and (iii) conductive coatings that can make electrochemical reactions take place outside the TSA/coating crevice. A number of coatings have been selected for testing with this in mind and tested in the ISO 20340 cyclic ageing test. The repair coatings were zinc rich primers of various types and silicate coatings with aluminium particles magnesium particles and magnesium oxide.

 Key words: TSA, repair coating, durability

Product tags
Also Purchased
Picture for 04022 Experiences on Thermal Spray Aluminum
Available for download

04022 Experiences on Thermal Spray Aluminum (TSA) Coating for Offshore Structures

Product Number: 51300-04022-SG
ISBN: 04022 2004 CP
Author: Desmond K.K. Tiong, Shell International; Halimah Pit, Sarawak Shell Berhad
Publication Date: 2004
$20.00

Since 1982, there has been a move to Thermal Sprayed Aluminum (TSA) coating in the “splash zone” of offshore structures.  Our experience indicates that an experience applicator, good surface preparation and quality of wire combined to achieve required thickness and apply the sealer to seal the entire surface.

 
Picture for 04023 Rapid Degradation of Painted TSA
Available for download

04023 Rapid Degradation of Painted TSA

Product Number: 51300-04023-SG
ISBN: 04023 2004 CP
Author: Ole Oystein Knudsen and Trond Rogne, SINTEF Materials Technology; Torstein Rossland, Statoil Bergen
$20.00
Picture for Deployment of CUI Prevention Strategies and TSA Implementation in Projects
Available for download

Deployment of CUI Prevention Strategies and TSA Implementation in Projects

Product Number: 51312-01100-SG
ISBN: 01100 2012 CP
Author: John J. Houben
Publication Date: 2012
$20.00

This document captures the key components required to get Thermal spray aluminum (TSA) coating installed by material engineering, project design and execution. These execution details apply to any TSA and insulation system installation whether it is a new construction project or in-plant maintenance project.
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