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Technical Brief

Hoar Frost Accretion on Organic Coatings Under Offshore Conditions

[+] Author and Article Information
A. W. Momber

Muehlhan AG,
Schlinckstraße 3,
Hamburg 21107, Germany
e-mail: momber@muehlhan.com

M. Irmer

Fraunhofer Application Center for Large Structures
in Production Engineering (AGP),
Albert-Einstein-Straße 30,
Rostock D-18059, Germany
e-mail: michael.irmer@hro.ipa.fraunhofer.de

N. Glück

Fraunhofer Application Center for Large Structures
in Production Engineering (AGP),
Albert-Einstein-Straße 30,
Rostock D-18059, Germany
e-mail: nikolai.glueck@hro.ipa.fraunhofer.de

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 23, 2015; final manuscript received May 24, 2016; published online July 29, 2016. Assoc. Editor: Søren Ehlers.

J. Offshore Mech. Arct. Eng 138(6), 064502 (Jul 29, 2016) (9 pages) Paper No: OMAE-15-1129; doi: 10.1115/1.4033931 History: Received December 23, 2015; Revised May 24, 2016

Nine organic corrosion protection coating systems are investigated according to their hoar frost accretion performance under simulated offshore conditions. A special test scenario is developed for the generation and measurement of defined hoar frost layers. Hoar frost layer thickness is estimated on newly applied coatings and on artificially aged coatings. The aging procedure refers to offshore conditions, which mainly cover low temperatures, dry–wet cycles, salt spray, and ultraviolet (UV) radiation. In average, the accreted thickness either did not change significantly or increased. Spearman's rank correlations were estimated for all surface parameters. If all measurements (new and aged) for an individual surface parameter were considered, only weak correlations were found between hoar frost thickness, static contact angle, specific surface energy, and surface roughness. The importance of UV radiation on the appearance of hoar frost is highlighted.

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Figures

Grahic Jump Location
Fig. 1

EDX spectra of four top coats (see Table 1 for derived filler/pigment materials); 1, 3, 5, and 7 correspond to the numbers of the coating systems in Table 1

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Fig. 2

Hoar frost accretion testing setup. (a) General arrangement, (b) infrared image of cooled coating surface, and (c) gauge for hoar frost thickness measurement.

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Fig. 3

Effects of coating system and aging on the hoar frost thickness

Grahic Jump Location
Fig. 4

Proposed effects of UV exposure on hoar frost accretion

Grahic Jump Location
Fig. 5

Relationships between surface parameters and hoar frost thickness. (a) Static contact angle, (b) specific surface energy, (c) dissipative part of surface energy, (d) polar part of surface energy, and (e) average maximum roughness Rz.

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