Hoar Frost Accretion on Organic Coatings Under Offshore Conditions

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
A. W. Momber ◽  
M. Irmer ◽  
N. Glück
Keyword(s):  
Uv Radiation ◽  
Salt Spray ◽  
Surface Parameter ◽  
Test Scenario ◽  
Specific Surface Energy ◽  
Static Contact ◽  
Frost Layer Thickness ◽  
Corrosion Protection Coating ◽  
Protection Coating ◽  
Frost Layer

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.

Static Electroplating of Iron Triad on Fastener Washers

2021 ◽  
Vol 879 ◽  
pp. 275-283
Author(s):  
Koay Mei Hyie ◽  
Salina Budin ◽  
Normariah Che Maideen ◽  
Yudi Rahmawan
Keyword(s):  
Carbon Steel ◽  
Low Cost ◽  
Sem Analysis ◽  
Nickel Iron ◽  
Cobalt Nickel ◽  
Protection Layer ◽  
And Performance ◽  
Resistant Layer ◽  
Corrosion Protection Coating ◽  
Protection Coating

Fasteners are commonly used in construction industry for parts joining purpose. There are many types of construction fasteners such as stud, bolt, anchor, nut, screw, and washer. The major problem of the fastener made by carbon steel is the poor resistance to corrosion. Electroplating is a simple yet low-cost tool to give a strong corrosion protection coating layer on the carbon steel. This study was performed to investigate the effect of current and deposition time on the iron triad (cobalt-nickel-iron) electroplating on the fastener washer. The experiment was conducted at 50 °C, pH 1-3 and at different electroplating time (30 minutes to 90 minutes) and current (0.2 A to 0.5 A). Burnt-out surface coating was observed on the fastener washer when the current was more than 0.4 A. A field test was carried out for 60 days to observe the corrosion behavior and performance of the products. Scanning electron microscope (SEM) analysis showed that a thin protection layer with 5.64 µm was formed at 60 minutes of electroplating time and 0.4 A of current. The surface roughness of the fastener washer was increased by increasing the electroplating time and current. The hardness was also improved with higher current and electroplating time if compared to the original fastener washer. The result of this study confirmed that a strong adhesive corrosion resistant layer to the fastener washer was using the current of 0.4 A (77 mA/cm2) and the electroplating time of 60 minutes.

Corrosion protection coating containing polyaniline glass flake composite for steel

2008 ◽  
Vol 53 (5) ◽  
pp. 2087-2094 ◽  
Author(s):  
S. Sathiyanarayanan ◽  
S. Syed Azim ◽  
G. Venkatachari
Keyword(s):  
Corrosion Protection ◽  
Glass Flake ◽  
Corrosion Protection Coating ◽  
Protection Coating

Quantitative deterioration evaluation of corrosion protection coating by near-infrared measurement

2018 ◽  
Vol 2018 (0) ◽  
pp. OS0402
Author(s):  
Yuuki MATSUMOTO ◽  
Takahide SAKAGAMI ◽  
Daiki SHIOZAWA ◽  
Yoshiaki MIZOKAMI ◽  
Noriyasu ARIMA ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Near Infrared ◽  
Infrared Measurement ◽  
Corrosion Protection Coating ◽  
Protection Coating

Estimation of a Nusselt Correlations for Numerical Prediction of Frost Thickness Growth over a Cold Cylinder

2014 ◽  
Vol 875-877 ◽  
pp. 771-775
Author(s):  
Raquel da Cunha Ribeiro da Silva ◽  
Carlos T. Salinas ◽  
Kamal A.R. Ismail
Keyword(s):  
Numerical Solution ◽  
Experimental Studies ◽  
Optimization Method ◽  
Cylinder Surface ◽  
Frost Formation ◽  
Modeling Process ◽  
Numerical Predictions ◽  
New Correlation ◽  
Frost Layer Thickness ◽  
Frost Layer

This paper evaluates numerically some of the parameters involved in modeling the process of frost formation over a cold cylinder surface subject to the flow of humid air. Was utilized for numerical predictions the empirical Nusselt correlation from the literature, obtained in experimental studies on frost formation phenomena of frost grow over a cold cylinder surface. To predict frosting process a numerical solution was utilized, and a new correlation for Nusselt number based on the experimental correlation of Kim was estimated. For the new Nusselt correlation an optimization method that adjusts the numerical solution of modeling the frost formation process with experimental results of the frost layer thickness was used. The calculation procedure allows the estimation of the parameter K of equation. The modeling process was validated by comparison with available experimental data.

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