Polystyrene films as barrier layers for corrosion protection of copper and copper alloys

Abstract

Dip-coated polystyrene layers of sub-micrometre thickness (85-500 nm) have been applied on copper and copper alloys (aluminium brass, copper-nickel 70/30), as well as on stainless steel 304, and produced an effective barrier against corrosion and adhesion of corrosion-relevant microorganisms. According to the dynamic wettability measurements, the coatings exhibited high advancing (103°), receding (79°) and equilibrium (87°) contact angles, low contact angle hysteresis (6°) and surface free energy (31 mJ/m 2 ). The corrosion rate of copper-nickel 70/30 alloy samples in 3.5% NaCl was as low as 3.2 µm/a (44% of that of the uncoated samples), and in artificial seawater was only 0.9 µm/a (29% of that of the uncoated samples). Cell adhesion was studied by fluorescence microscopy, using monoculture of Desulfovibrio alaskensis. The coatings not only decreased the corrosion rate but markedly reduced the number of bacterial cells adhered to the coated surfaces. The PS-coating on copper gave the best result, 2×10 3 cells/cm 2 (1% of that of the uncoated control).

Improved Optical and Morphological Properties of Vinyl-Substituted Hybrid Silica Materials Incorporating a Zn-Metalloporphyrin

“…Thus, for a thorough characterization, the receding angles are important. As pointed out previously [ 84 , 85 ], the characteristics of a surface often correlate better (i.e., more strongly) with the receding angles (de-wetting) than the advancing ones (wetting). Unfortunately, taking into account the powdery state of the samples, a sessile drop type measurement of neither the receding angle nor the roll-off angle was feasible.…”

A comparison of contact angle measurement results obtained on bare, treated, and coated alloy samples by both dynamic sessile drop and Wilhelmy method

“…These tubes suffer from biofouling and the consecutive microbially-induced corrosion [14]. Nanolayers are potential solutions for the mitigation of the problem [15][16][17][18][19][20][21][22], and the success of the nanolayer coating procedure is routinely checked by CA measurements [23].…”

Recycling Polymeric Materials for Corrosion Control

“…Románszki et al [59] they used polystyrene layers thickness (85-500 nm) as effective coating on copper and copper alloys as well as on stainless steel 304 to control the corrosion in artificial seawater.…”