The initiation and propagation of coating morphological and structural defects under mechanical strain and their effects on the electrochemical behaviour of pipeline coatings

Ranade, Shyama Deepak; Forsyth, Maria; Tan, Yongjun

doi:10.1016/j.porgcoat.2017.04.047

Cited by 16 publications

(5 citation statements)

References 42 publications

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“…The inlet is assumed to simulate the surface pores which were seen to act as entry points for electrolyte in a previous publication. [ 42 ]…”

Section: Resultsmentioning

confidence: 99%

“…The inlet is assumed to simulate the surface pores which were seen to act as entry points for electrolyte in a previous publication. [42] The resultant velocity contours and velocity streamlines have been presented for three planes in Figures 15a and 16a. The legend depicts velocity magnitude, wherein the red color at the top is the highest value and the blued color at the bottom is the lowest value.…”

Section: Simulation Of Electrolyte Flow Through Oil-modified Coatings...mentioning

confidence: 99%

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Exploring in situ integration of pongamia oil to improve barrier properties of polyurethane coatings

Ranade

Neelakantan

2020

J of Applied Polymer Sci

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Polyurethane coatings have been the focus of continuous innovation, such as bio‐based coatings and self‐healing coatings. This study investigates the route achieving superior coatings by in situ integration of pongamia oil during the curing process. Stronger urethane and carbonyl bonds for these oil‐modified coatings are observed using Fourier transform infra‐red spectroscopy. Thermogravimetric analysis reveals an increase in their thermal stability. A sustained high coating resistance and an increased Bode impedance (by ∼102 Ω cm2) for the oil‐modified coatings is observed using electrochemical impedance spectroscopy, which is corroborated by the cyclic corrosion test. Scanning electron microscopy depicts a roughened coating morphology with an increased water contact angle due to the integrated oil‐polyurethane polymer chains. Further, a preliminary computational fluid dynamics confirms this inhibited electrolyte mass flow through an oil‐modified coating with denser regions as compared to a clear coating. A consolidated schematic model incorporating the experimental and simulation results is proposed.

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“…The inlet is assumed to simulate the surface pores which were seen to act as entry points for electrolyte in a previous publication. [ 42 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Simulation Of Electrolyte Flow Through Oil-modified Coatings...mentioning

confidence: 99%

Exploring in situ integration of pongamia oil to improve barrier properties of polyurethane coatings

Ranade

Neelakantan

2020

J of Applied Polymer Sci

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“…The two types of particles with angular shapes are the Li 2 CO 3 and BaSO 4 particles. If two different inorganic additives have distinct shapes for example, rounded spheres versus acicular particles, then the channel network may be more likely to develop along clusters of acicular particles [83]. In this case the high solubility of the Li 2 CO 3 particles and their angular shape makes them much more susceptible to being incorporated into the developing cluster channel network.…”

Section: Geometric Considerations When Comparing Leaching From a Scribe Interface To That From The Primer Surfacementioning

confidence: 99%

Li leaching from Li carbonate-primer: Transport pathway development from the scribe edge of a primer/topcoat system

Visser

Ranade

Laird

et al. 2021

Progress in Organic Coatings

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“…As noted above, the vast majority of studies of leaching from inhibited primers focus on release kinetics and use electrochemistry to explore leaching behavior [46,[56][57][58][59][60]. There are fewer physicochemical studies which look in detail at the physical and chemical changes in the primer [61] as a result of leaching and fewer still which investigate the role of mechanical degradation resulting from water uptake and inhibitor dissolution on the generation of transport structures in coatings [62,63] although there are some which consider the influence of inorganic fillers in swelling of coatings [64][65][66][67]. So, in this paper the authors examine the leaching of components of a Li 2 CO 3 -loaded polyurethane primer which contains in addition to the inhibitor, the inorganic phases magnesium oxide (MgO), barium sulphate (BaSO 4 ) and titanium dioxide (TiO 2 ).…”

Section: Introductionmentioning

confidence: 99%

Li leaching from Lithium Carbonate-primer: An emerging perspective of transport pathway development

Laird

Visser

Ranade

et al. 2019

Progress in Organic Coatings

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Studies of Li depletion in sections of Li 2 CO 3 -primer comprising a polyurethane binder, MgO, TiO 2 , BaSO 4 in addition to Li 2 CO 3, were performed using a combination of particle induced γ-ray and X-ray emission spectroscopies along with SEM/EDS analysis. A mixture of depletion behaviours were observed. At the earliest stages (to around 48 hours) initial release was confined to the surface. At longer times (168 hours) voids developed deeper into the primer and after 500 hours Li 2 CO 3 dissolution was observed at places throughout the thickness of the primer to the metal/primer interface. Microscopic transport pathways formed which involved all large inorganic particles. SEM showed that rupture of the polyurethane matrix contributed to network formation. Finite element analysis indicated that rupture may be due to internal stresses around particles isolated in the polyurethane matrix and associated with water uptake. Thus the transport network seemed to be generated by chemical dissolution at the particle/polymer interface and may be enhanced by mechanical degradation due to internal mechanical stresses. The release kinetics of Li 2 CO 3 inhibitor from the primer was followed as a function of time and the data analysed according to a release behaviour of t n . There was very rapid initial release of Li followed by a slower release of Mg and to a lesser extent Ba. The value of n varied significant with time, but showed a mixture of Fickian release and direct dissolution for Mg and Ba at intermediate times, but transport through a pore network at longer times. The leaching data was interpreted in terms of local transport networks that developed in the primer with time.

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The initiation and propagation of coating morphological and structural defects under mechanical strain and their effects on the electrochemical behaviour of pipeline coatings

Cited by 16 publications

References 42 publications

Exploring in situ integration of pongamia oil to improve barrier properties of polyurethane coatings

Exploring in situ integration of pongamia oil to improve barrier properties of polyurethane coatings

Li leaching from Li carbonate-primer: Transport pathway development from the scribe edge of a primer/topcoat system

Li leaching from Lithium Carbonate-primer: An emerging perspective of transport pathway development

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