Morshed, Ali;
(2002)
Surface modification for corrosion protection of steel pipes.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Corrosion of carbon steel oil pipelines in the sweet environments has been a well- known problem in the oil industry all over the world and corrosion inhibitors of the film forming type have been widely used to combat this type of corrosion. In this project numerous effort has been made to devise a similar way of corrosion mitigation by producing an impermeable and protective coating made of precipitated iron carbonate scale. Based on the previous works it was suggested that iron carbonate scale as the corrosion product (of carbon steel and CO2) could to some extent offer protection to its substrate and reduce the corrosion rate effectively. However, precipitating an adherent and protective iron carbonate scale has not been an easy job. Our main objectives during this work have been firstly to define the favourable conditions under which an iron carbonate scale would precipitate in the system and then to investigate how the protective characteristics of the scale could be improved. The effects of several environmental variables like solution pH, solution temperature, additives (scale inhibitors), stirring and solution composition on the scale properties such as adhesion, surface coverage, stability and porosity (scale density) have been investigated. Simultaneously, the adverse effects of certain conditions or variables that tended to reduce the scale protectiveness or prevent its precipitation have been investigated and discussed. Some of the presented results are rather qualitative; nevertheless it is believed that they have contributed in the better understanding of the iron carbonate scale properties and its precipitation process. Based on the results and conclusions of this project few suggestions have been made at the end for the possible continuation of this work.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Surface modification for corrosion protection of steel pipes |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Thesis digitised by ProQuest. |
| Keywords: | Applied sciences; Corrosion; Steel |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10101871 |
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