Blar i NTNU Open på forfatter "Lunder, Otto"
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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 ... -
Comparing intergranular corrosion in Al‐Mg‐Si‐Cu alloys with and without α‐Al(Fe,Mn,Cu)Si particles
Lervik, Adrian; Danbolt, Turid; Furu, Trond; Holmestad, Randi; Lunder, Otto (Peer reviewed; Journal article, 2020)In this study, a model alloy without Fe and Mn additions, is compared with a commercial AA6005 alloy to further understand how the α‐Al(Fe,Mn,Cu)Si particles affect intergranular corrosion (IGC) behaviour. Both alloys were ... -
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 Behaviour of Aluminium-Steel Welded Joints
Tranø, Fredrik Heggeset (Master thesis, 2018)Multi-material solutions is a hot research topic in the automotive industry. The possibility to combine the physical and mechanical properties of different materials in a car component can both increase passenger safety, ... -
Corrosion Development in Welded AA6082 Alloys
Blommedal, Kim (Master thesis, 2013)AlMgSi alloys, frequently used as extruded profiles, generally show excellent corrosionresistance, as Mg is incorporated in the protective oxide layer, thus providing additionalstabilization. However, localized corrosion ... -
Corrosion fatigue of an extruded 7046 alloy
Christiansen, Kyrre Stefansson (Master thesis, 2018)The corrosion fatigue properties of a 7046 alloy were investigated and compared to previously reported work by SINTEF on the same alloy tested in air. To establish the corrosion fatigue properties, samples were either ... -
Corrosion Protection of Machined Steel Surfaces
Andersen, Silje Bergset (Master thesis, 2017)Protection of smooth, machined surfaces is challenging as the surfaces do not have the roughness required to provide proper adhesion between the substrate and the coating. This gives poor corrosion resistance and lower ... -
Critical temperature of welded 25Cr duplex stainless steel in seawater
Rueda Urdaneta, Alejandra Cristina (Master thesis, 2019)Statens Vegvesen planlegger ˚a bygge verdens lengste flytebro over Bjørnafjorden som en del av Ferjefri E39- prosjektet. En av de foretrukne alternativene involverer karbonst˚al-pontonger med et belte rundt skvalpesonen ... -
Effect of Cathodic Polarization on the Susceptibility to Hydrogen Embrittlement in 5xxx, 6xxx and 7xxx Series Aluminium Alloys
Veium, Kjetil Fossland (Master thesis, 2015)Aluminium is an interesting material for use in subsea applications due to the combination of low weight, good corrosion resistance and superior low temperature properties. So far, the use of aluminium alloys in offshore ... -
Effect of Copper and Zinc on Corrosion Behaviour and Mechanical Properties in 6082-Alloys
Stoknes, Marie (Master thesis, 2015)Extruded Al-Mg-Si alloys with Cu additions are frequently used in heavy loaded structures, offshore installations and the transportation industry. In contrast to the positive effect Cu has on mechanical properties, the ... -
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 Cu2+ on deposition mechanism and structure of ZrO2-based conversion coatings on AA6060 aluminium alloys and their susceptibility to filiform corrosion
Mysliu, Erlind; Storli, Kathrine Sletteberg; Skogøy, Hanna Marie; Kubowicz, Stephan; Svenum, Ingeborg-Helene; Lunder, Otto; Erbe, Andreas (Peer reviewed; Journal article, 2024)Zirconium oxide-based conversion coatings (CCs) were prepared from hexafluorozirconic acid, H2ZrF6, with and without CuII as an additive. The CCs were prepared on primary and recycled AA6060. The deposition mechanism, ... -
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 ... -
The Effect of Microstructure and Cu Content on Corrosion Behavior of 6060 Aluminum Alloy
Tømmerdal, Max (Master thesis, 2018)AlMgSi alloys have gained more popularity in the automobile industry in recent years due to attractive properties such as good corrosion resistance, machineability and high strength-to-weight ratio. Cu is commonly added ... -
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 ... -
Grain boundary structures and their correlation with intergranular corrosion in an extruded Al-Mg-Si-Cu alloy
Lervik, Adrian; Wenner, Sigurd; Lunder, Otto; Marioara, Calin Daniel; Holmestad, Randi (Peer reviewed; Journal article, 2020)A detailed analysis of grain boundaries in a highly textured Al-Mg-Si-Cu alloy is presented in this work. Electron backscatter diffraction demonstrates the presence of three main categories of grain boundaries in addition ... -
Hydrogen Induced Stress Cracking of Inconel 625 - Effect of Production Method, Heat Treatment and Cold Working
Thorstensen, Eivind Bruun (Master thesis, 2016)The following work has examined the effect of heat treatment, production method and cold working (CW) on the hydrogen induced stress cracking (HISC) susceptibility of Inconel 625 (UNS N06625). This was done by hydrogen ... -
Initiation and Propagation of Intergranular Corrosion on AA6005 Aluminium Alloy
Kumari, Shilpa (Doctoral theses at NTNU;2018:391, Doctoral thesis, 2018)The increasing use of 6xxx series aluminium alloys (AlMgSi) in automotive applications is due to its high strength to weight ratio (enabling substantially reduced fuel consumption and CO2 emissions than for heavier materials ... -
Intergranular Corrosion of Extruded AlMgSi(Cu,Zn) Alloys
Lam, Phuong Vy Thi (Master thesis, 2016)In general, the 6xxx series alloys (AlMgSi) are considered to be resistant to intergranular corrosion (IGC) in marine environments. However, the addition of copper to increase peak hardness has proven to increase the IGC ...