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11067 C02 Corrosion Resistance of Steel Cord Reinforced Thermoplastic Materials for Flexible Pipe Systems

Picture for 11067 C02 Corrosion Resistance Steel Cord Reinforced Thermoplastic Material for Flexible Pipe System
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Product Number: 51300-11067-SG
ISBN: 11067 2011 CP
Author: Andreas Klust, Frederik Vervaecke, Anneleen De Smet and Johan Vanbrabant
Publication Date: 2011
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$20.00
$20.00
Steel cord reinforced thermoplastic (SC-RTP) tape is a composite material consisting of parallel steel cords embedded in a thermoplastic matrix. SC-RTP tape was developed for reinforcing high-pressure flexible thermoplastic. SC-RTP composite material offers easy processing, high tensile strength of steel cords, and corrosion resistance of zinc coatings combined with polymers.

High pressure pipes can be obtained by wrapping them with layers of SC-RTP tape. The liner of the pipe and the thermoplastic matrix material protect the steel cord from direct contact with corrosive fluids. Corrosion of the steel cord can occur '#hen molecules permeate through the polymer. Steel cords inside the polymer tape are protected from corrosion by a passivating zinc coating. This study focuses on corrosion processes caused by CO2 and water. SC-RTP tape samples were exposed to a humid C02 environment for up to 3 years. The corrosion rate was determined by measuring the decrease of metallic (non-oxidized) zinc in the coating. The observed corrosion rate of the zinc coating is low. This can be attributed to limited space between steel cord filaments and the polymer resulting in the formation of a passive zinc carbonate layer. This passivation layer was characterized with X-ray photoelectron spectroscopy.

Key words: flexible pipe, steel cord, thermoplastic polymer, composite, CO2 corrosion, reinforced thermoplastic pipe, RTP, corrosion in confined environments
Steel cord reinforced thermoplastic (SC-RTP) tape is a composite material consisting of parallel steel cords embedded in a thermoplastic matrix. SC-RTP tape was developed for reinforcing high-pressure flexible thermoplastic. SC-RTP composite material offers easy processing, high tensile strength of steel cords, and corrosion resistance of zinc coatings combined with polymers.

High pressure pipes can be obtained by wrapping them with layers of SC-RTP tape. The liner of the pipe and the thermoplastic matrix material protect the steel cord from direct contact with corrosive fluids. Corrosion of the steel cord can occur '#hen molecules permeate through the polymer. Steel cords inside the polymer tape are protected from corrosion by a passivating zinc coating. This study focuses on corrosion processes caused by CO2 and water. SC-RTP tape samples were exposed to a humid C02 environment for up to 3 years. The corrosion rate was determined by measuring the decrease of metallic (non-oxidized) zinc in the coating. The observed corrosion rate of the zinc coating is low. This can be attributed to limited space between steel cord filaments and the polymer resulting in the formation of a passive zinc carbonate layer. This passivation layer was characterized with X-ray photoelectron spectroscopy.

Key words: flexible pipe, steel cord, thermoplastic polymer, composite, CO2 corrosion, reinforced thermoplastic pipe, RTP, corrosion in confined environments
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