Research Papers: Materials Technology

Investigation Into the Performance of a Dual-Layer Thin-Film Organic Coating During Accelerated Low-Temperature Offshore Testing

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

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

M. Irmer, N. Glück

Fraunhofer AGP,
Albert-Einstein-Straße 30,
Rostock 18059, Germany

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received November 9, 2016; final manuscript received January 25, 2017; published online May 5, 2017. Assoc. Editor: Søren Ehlers.

J. Offshore Mech. Arct. Eng 139(4), 041402 (May 05, 2017) (9 pages) Paper No: OMAE-16-1138; doi: 10.1115/1.4036207 History: Received November 09, 2016; Revised January 25, 2017

The application of thin-film coatings is a method to protect armatures, accessories, and control elements on offshore facilities against corrosion and mechanical damages. The performance of a dual-layer thin-film (30 μm) coating system under simulated Arctic offshore exposure was investigated. The coating system consisted of polyamide-based primer and molybdenum-disulfide (MoS2)/polytetrafluoroethylene (PTFE)—modified topcoat. The investigations involved the following tests: accelerated corrosion protection/aging tests, coating adhesion tests, scanning electron microscopy (SEM)/energy-dispersive X-ray (EDX) inspections, static contact angle measurements, specific surface energy measurements, hoarfrost accretion, and abrasion resistance tests. The test conditions were adapted to Arctic offshore conditions. Effects of accelerated offshore aging on surface morphology, surface chemistry, and hoarfrost accretion were also investigated.

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Fig. 1

SEM image of a metallurgical cross section, characterizing the dual-layer structure of the coating system (scale bar: 10 μm). The numbers 1–3 designate locations for energy dispersive X-ray (EDX) analysis (see Figs. 5 and 8). Inclination angle is denoted α. The letters A–C designate the layers.

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Fig. 2

Testing samples (ISO 20340 [14]) with dimensions and results of the accelerated aging tests for −60 °C (arrows in the right image mark scribe delamination); marked sections: 1, new sample; 2, aged section without corrosion products; and 3, aged section with corrosion products

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Fig. 3

SEM images of the top coat: (a) new coating (mark “1” in Fig. 2) and (b) coating after aging (mark “2” in Fig. 2; see Fig.8 for spectrum “b”)

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Fig. 4

Setup for abrasion resistance tests [5]: 1, weight; 2, abrasive wheel; 3, coated specimen; 4, wear track; and 5, suction nozzle

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Fig. 5

EDX spectra of different coating sections: (a) EDX spectrum of the marked section “1” in Fig. 1, confirming molybdenum (Mo) and sulfur (S); (b) EDX spectrum of the marked matrix section “2” in the top layer in Fig. 1, confirming molybdenum (Mo), sulfur (S), and fluorine (F); and (c) EDX spectrum of marked section “3” in the primer layer in Fig. 1

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Fig. 6

Effect of primer application accuracy on platelet inclination angle. Inclination angle increases notably in deeper cavities in the applied primer layer (arrowed).

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Fig. 7

Statistical parameters for the MoS2 platelets; see Table 2: (a) platelet length and (b) platelet inclination angle

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Fig. 8

EDX spectrum of the top coat of an aged coating (see Fig. 3(b) for location of spectrum “b”)

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Fig. 9

Example for a contact angle (water) distribution on a newly coated sample; nine measurement fields and 45 individual measurements; numbers underneath the graph designate contact angle ranges in degree

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Fig. 10

SEM image of the abraded sample at 0 °C (scale: 100 μm)

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Fig. 11

Taber abrasion resistance functions for the two temperature levels (0 °C and 20 °C)




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