Abstract
Quantitative analysis of localized corrosion in tensile armor wire of flexible riser submitted to sweet stress corrosion cracking testing with crevice
Highlights
Flexible risers are widely applied on floating offshore platforms worldwide and they are considered a standard fluid conduction system in several offshore units in Brazil [1,2]
Stress corrosion cracks (SCC) associated with crevice corrosion can occur in the wires and they cause accelerated degradation processes related to carbon oxides and carbides [11,12]
Quantitative analysis of localized corrosion in tensile armor wire of flexible riser submitted to sweet stress corrosion cracking testing with crevice carbon steel chemical composition respectively, both as manganese alloy [16]
Summary
Flexible risers are widely applied on floating offshore platforms worldwide and they are considered a standard fluid conduction system in several offshore units in Brazil [1,2]. The use of carbon steel in riser’s metallic armor due to their lower overall cost, increases the corrosion susceptibility [6]. The space between polymeric protective layers in which the carbon steel tensile armor wires are located is called annular and has a basically structural function. Failures related to the annular are sensitive, since there is a much greater propensity for collapse due to accelerated corrosion compared to the polymeric and stainless steel alloy components on the riser’s outside and inside layers, respectively [7]. The permeability of annulus’ polymeric layers exposes steel wires to corrosion [8] and its severity is important [9,10]. The combination of the mechanisms provides pitting in the carbon steel
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