Thermally Sprayed Aluminum (TSA) Coatings for Extended Design Life of 22%Cr Duplex Stainless Steel in Marine Environments

Paul, Shiladitya; Shrestha, Suman; Lee, C. M.; Harvey, M. D. F.

doi:10.1007/s11666-012-9879-2

Cited by 9 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The inherent differences in the contract due to differences in atomic number is understandable in backscattered electron (BSE) imaging. Ca (20) with higher the atomic number than Mg (12) appears brighter in the image. The TSA-coated steel specimens kept at OCP showed 'grey' appearance after completion of the test.…”

Section: Post-test Microstructural Observationsmentioning

confidence: 97%

“…This is in line with the literature data. The transition from brucite to aragonite is still not fully understood and several explanations of the mechanism have been proposed [6,20,35,[65][66][67][68]. The most widely adopted is the inhibiting effect of Mg 2+ ions on the nucleation and growth of calcite and the nucleation of aragonite.…”

Section: Influence Of Calcareous Depositsmentioning

confidence: 99%

“…In addition, these coatings also act as a barrier when intact. If these coatings are damaged in service, the proximity of the anodic coating allows the steel in the damaged region to remain cathodically polarized and hence protected as long as a layer of electrolyte (seawater) is present [20][21][22][23][24][25]. The cathodic polarisation of steel in the damaged region also results in the localised increase in pH.…”

Section: Introductionmentioning

confidence: 99%

“…The localised increase in pH at the steel-seawater interface is brought about by the cathodic reactions, such as reduction of dissolved oxygen or water. This in turn causes deposition of calcareous matter, such as Ca-and Mg-containing minerals (which are present in abundance in seawater) in the damaged region thereby providing additional protection [5,20,26,27].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrogen in Aluminium-Coated Steels Exposed to Synthetic Seawater

Paul

2020

Surfaces

View full text Add to dashboard Cite

Thermally sprayed aluminium (TSA) coatings provide protection to offshore steel structures without the use of external cathodic protection (CP) systems. These coatings provide sacrificial protection in the same way as a galvanic anode, and thus hydrogen embrittlement (HE) becomes a major concern with the use of high strength steels. The effect of TSA on the HE of steel seems to remain largely unknown. Further, the location of hydrogen in TSA-coated steel has not been explored. To address the above knowledge gap, API 5L X80 and AISI 4137 steel coupons, with and without TSA, were prepared and the amount of hydrogen present in these steels when cathodically polarised to −1.1 V (Ag/AgCl) for 30 days in synthetic seawater was determined. One set of TSA-coated specimens was left at open circuit potential (OCP). The study indicates that the amount of hydrogen present in TSA-coated steel is ~100 times more than the amount found in uncoated steel, and that the hydrogen seems to be largely localised in the TSA layer.

show abstract

Section: Post-test Microstructural Observationsmentioning

confidence: 97%

Section: Influence Of Calcareous Depositsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogen in Aluminium-Coated Steels Exposed to Synthetic Seawater

Paul

2020

Surfaces

View full text Add to dashboard Cite

show abstract

“…More recently, the use of TSA on stainless steels to prevent galvanic corrosion of nearby carbon steels or to protect stainless steels like 22%Cr duplex or 25%Cr super duplex stainless steels from hydrogen stress cracking (HSC) from CP‐systems or chloride stress corrosion cracking (SCC) have been investigated . TSA has also been used to protect duplex stainless steels from localized corrosion like crevice corrosion or pitting in atmospheric conditions or under insulation.…”

Section: Introductionmentioning

confidence: 99%

Properties of TSA in natural seawater at ambient and elevated temperature

Wilson

Johnsen

Torres

et al. 2018

Materials & Corrosion

View full text Add to dashboard Cite

Electrochemical properties of thermal sprayed aluminium (TSA) coating were investigated in natural seawater at elevated temperatures with and without cathodic protection (CP). TSA has a low current density requirement when connected to a CP system, regardless of temperature. The corrosion rates for TSA were found to be low both under CP and at open circuit potential at temperatures in the range 20–90 °C. However, measurements of the TSA coating thickness before and after exposure indicate there might be chemical dissolution of the coating. However, this has not been reported anywhere else in the literature, so more data is necessary to conclude. Post exposure analysis indicated calcareous deposits on the TSA exposed for up to 280 days. In SEM small amounts were found, and the type of deposits were dependent on temperature, with the deposits being more based on Mg at higher temperatures.

show abstract

Mitigating Localized Corrosion Using Thermally Sprayed Aluminum (TSA) Coatings on Welded 25% Cr Superduplex Stainless Steel

Paul

Harvey

2015

J Therm Spray Tech

View full text Add to dashboard Cite

Thermally Sprayed Aluminum (TSA) Coatings for Extended Design Life of 22%Cr Duplex Stainless Steel in Marine Environments

Cited by 9 publications

References 10 publications

Hydrogen in Aluminium-Coated Steels Exposed to Synthetic Seawater

Hydrogen in Aluminium-Coated Steels Exposed to Synthetic Seawater

Properties of TSA in natural seawater at ambient and elevated temperature

Mitigating Localized Corrosion Using Thermally Sprayed Aluminum (TSA) Coatings on Welded 25% Cr Superduplex Stainless Steel

Contact Info

Product

Resources

About