Adsorption at Treated Steel-Paint Interfaces
type: CreativeWork
description: In this thesis, a wide range of surface sensitive techniques have been used to characterise surfaces relevant to offshore steel structures, to provide fundamental understanding of steel-paint binding that prolongs coating lifespans and corrosion inhibition. Particular steel surfaces are characterised before and after almandine garnet abrasive blasting. Significant build-up and coverage of abrasive residue (almandine and calcium carbonate) is identified on the post-treatment steel, covering up to a third of the steel surface; Given the importance of the blasting materials on the surface, almandine garnet is also characterised for its surface chemistry and behaviour. By characterising both bare steel and almandine garnet, adsorption on `real' garnet-blasted steel substrates can be modelled. A dry ice-garnet mixed stream is also investigated to see whether abrasive residue could be reduced. It is found that a quarter of the steel surface is covered with blasting residue. However, cooling and moisture-condensation leads to corrosion spots formation. The adsorption of potential paint additives and components on S355 steel and garnet are determined using solution depletion isotherms. Quantitative data such as equilibrium adsorption constants, and estimation of monolayer molecular geometries are collected. The latter is further investigated through novel surface spectroscopy. In brief, most organics are found to have higher The steel surface is shown to be likely to corrode in offshore conditions with corrosion marine aerosols in a matter of a few hours. It is these corrosion products which will be substrates for coating/paint molecules. A `salt drop' corrosion study simulates relatively short timescale aerosol exposure (mins to hours). Surface chemical-environments are characterised. The corrosion products are found to be porous, inhomogeneous in chemical environment, and evolve through time, with adsorbed/occluded marine ions. Finally, as steel corrosion products are lik…
abstract: In this thesis, a wide range of surface sensitive techniques have been used to characterise surfaces relevant to offshore steel structures, to provide fundamental understanding of steel-paint binding that prolongs coating lifespans and corrosion inhibition. Particular steel surfaces are characterised before and after almandine garnet abrasive blasting. Significant build-up and coverage of abrasive residue (almandine and calcium carbonate) is identified on the post-treatment steel, covering up to a third of the steel surface; Given the importance of the blasting materials on the surface, almandine garnet is also characterised for its surface chemistry and behaviour. By characterising both bare steel and almandine garnet, adsorption on `real' garnet-blasted steel substrates can be modelled. A dry ice-garnet mixed stream is also investigated to see whether abrasive residue could be reduced. It is found that a quarter of the steel surface is covered with blasting residue. However, cooling and moisture-condensation leads to corrosion spots formation. The adsorption of potential paint additives and components on S355 steel and garnet are determined using solution depletion isotherms. Quantitative data such as equilibrium adsorption constants, and estimation of monolayer molecular geometries are collected. The latter is further investigated through novel surface spectroscopy. In brief, most organics are found to have higher The steel surface is shown to be likely to corrode in offshore conditions with corrosion marine aerosols in a matter of a few hours. It is these corrosion products which will be substrates for coating/paint molecules. A `salt drop' corrosion study simulates relatively short timescale aerosol exposure (mins to hours). Surface chemical-environments are characterised. The corrosion products are found to be porous, inhomogeneous in chemical environment, and evolve through time, with adsorbed/occluded marine ions. Finally, as steel corrosion products are lik…
author: Poon, Chun Yin Jeffrey
language: en
keywords: surface chemistry, steel, corrosion, marine, garnet, adsorption, ions, isotherm, blasting, XPS, SEM, TEM, EDX, SFG, iron oxide, UV-Vis, spectroscopy, EBSD, surface characterisation
license: https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/b33bfe82-74b1-4333-817a-9c19187c2051/download
license: https://creativecommons.org/licenses/by/4.0/
date published: 2020-05-16
date modified: 2026-07-22T22:24:06Z
provider: Cambridge University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Cambridge

PropertyValue
property ID: DOI
value: 10.17863/CAM.46068