Blar i NTNU Open på forfatter "Nisancioglu, Kemal"
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AC corrosion on cathodically protected steel
Torstensen, Andreas (Master thesis, 2012)This report deals with the effect of alternating current on cathodically protected steel. AC corrosion has become relevant in the offshore industry due to the introduction of the direct electric heating system (DEH). The ... -
AC Induced Corrosion of Carbon Steel in 3.5wt% NaCl Electrolyte
Strandheim, Espen Oldeide (Master thesis, 2012)This paper deals with alternating current (AC) corrosion of low alloy carbon steel in 3.5 wt% NaCl electrolyte. Accelerated corrosion rates have been reported when exposed to AC and the corrosion mechanism is not well ... -
Alternating Current Corrosion of Aluminium Sacrificial Anodes
Forthun, Kari (Master thesis, 2013)Direct Electric Heating (DEH) is applied to subsea oil production and transmission pipelines to prevent freezing of hydrates as wax during productions shut downs. To prevent clogging, the pipes are heated by application ... -
Alternating Current Corrosion of Aluminum
Mjelde, Joachim (Master thesis, 2015)Formation of wax and hydrates due to production stops is a well-known problem in the oil industry. Conventionally the pipelines are heated beyond a critical temperature to avoid this problem. This is done by a method called ... -
Alternating Current Corrosion of Carbon Steel
Belland, Eirik (Master thesis, 2011)The objective was to investigate if the established theory concerning corrosion calculations and electrochemical behavior of carbon is valid when steel is exposed to AC in an electrolyte consisting of 3,5 wt% NaCl and ... -
Alternating Current Corrosion of Steel in Seawater
Bergin, Are (Master thesis, 2015)A challenge regarding the transportation of oil and gas in pipelines subsea is to keep the temperature high enough to avoid formation of wax and hydrates, which eventually will stop the flow. In 2000, Nexans introduced a ... -
Barrier Oxide Growth and Dissolution on Aluminium in Aqueous Media
Giskeødegård, Nils Håvard (Doctoral theses at NTNU;2016:326, Doctoral thesis, 2016)The oxide formed during anodization of aluminium has been a subject of attention since the beginning of the 20th century, due to its protective properties. The oxide consists of two layers, a dense layer adjacent to the ... -
Cathodic Protection of Steel-Aluminium Galvanic Couples for a New Generation of Lightweight Subsea Structures
Røstbø, Sondre (Master thesis, 2016)A new generation of lightweight subsea structures is planned for application in oil and gas production. Due to increasing weight of subsea installations, the use of aluminium as a structural material is of continuous ... -
Copper enriched by dealloying as external cathode in intergranular corrosion of aluminium alloy AA6005
Kumari, Shilpa; Wenner, Sigurd; Walmsley, John; Lunder, Otto; Nisancioglu, Kemal (Journal article; Peer reviewed, 2019)The purpose of this work is to understand the role of Cu in the propagation mechanism of IGC on extruded alloy AA6005-T5. The constituent Cu segregates as a Cu-rich nanolayer, together with the formation of a solute depleted ... -
Corrosion and Cathodic Protection of Steel-Aluminium Galvanic Couples in Subsea Structures
Jacobsen, Kristin (Master thesis, 2018)An increasing interest for use of aluminium in subsea structures has been seen the resent years, considering replacing some of the heavier steel components with aluminium. Due to good corrosion resistance and strength to ... -
Corrosion of Thermally Sprayed Aluminum in Flowing Seawater
Holager, Cathrine Selina (Master thesis, 2012)Raw sea water can be pumped into subsea wells where pressure drops have occurred to increase the pressure again and thereby the production rate. Thermally sprayed aluminum (TSA) is considered as internal corrosion protection ... -
Degradation mechanisms of AA 1350 aluminium alloy conductor strands in air and chloride solution
Foggi, Jiregna Hirko (Doctoral theses at NTNU;2020:170, Doctoral thesis, 2020)The primary aim of this doctoral thesis is to investigate the degradation mechanisms contributing to the failure of the aluminium strand material (AA 1350) used in steel reinforced aluminium conductors. These conductors ... -
Effect of Copper Content on etching Response of Aluminum in Alkaline and Acid Solutions
Dahlstrøm, Morten (Master thesis, 2012)Copper are used as an alloying element in aluminum alloys to increase the strength of the material. By mixing copper and aluminum the good corrosion resistance of the pure aluminum decreases giving the alloy a lower corrosion ... -
Effect of current density, electrolyte composition and temperature on hot alternating current anodising
Smith, Thea Madeleine Berg (Master thesis, 2017)Hot alternating current (AC) anodising has been established as a fast and reliable pre-treatment process for continuous coil coating. Hydro Aluminium Rolled Products AS (HARP) uses this process as a surface treatment before ... -
Effect of small concentrations of gallium and lead on anodic activation of aluminium in chloride solution
Senel, Esma; Nisancioglu, Kemal (Journal article; Peer reviewed, 2018)The presents objective is to investigate the combined effect of alloyed Pb and Ga on surface segregation by heat treatment and ensuing anodic activation of aluminium in chloride solution. Model alloys containing Pb and Ga, ... -
Effect of Sulfide Inclusions in Austenitic Stainless Steel on the Initiation of Pitting in Base Metal and Heat Affected Zone after Welding
Gjønnes, Anders Welde (Master thesis, 2012)The predominant site for the initiation of pitting on austenitic stainless steel has been shown to be sulfide inclusions and notably the manganese types of sulfides. Dissolution of inclusions has been observed and suggested ... -
Effect of tensile stress on hydrogen permeation in 13% Cr supermartensitic stainless steel
Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal (Chapter, 2010) -
Effects of three metal coupling on galvanic crevice corrosion
Solli, Harald (Master thesis, 2017)The subsea industry is moving its operations down onto the seabed. With this new direction in production solutions a larger emphasis is placed on reducing the weight of the components in the production unit. Finding ... -
High Temperature Cathodic Disbondin of Organic Coatings on Submerged Steel Structures
Gundersen, Håkon A Holm (Master thesis, 2011)There are currently no standard test methods for testing the cathodic disbonding properties of organic coatings at temperatures above 100 C. There are several subsea oil and gas reservoirs with high temperatures, some as ... -
In-situ determination of thickness and electrochemical properties of barrier oxide film on impure aluminium in aqueous solution
Giskeødegård, Nils Håvard; Hunderi, Ola; Nisancioglu, Kemal (Journal article; Peer reviewed, 2018)Lead is present as a trace element (ppm level) in nearly all commercial aluminium alloys. The objective of this work is to investigate the changes incurred by the presence of a small amount (20 ppm) of alloyed Pb and heat ...