Evaluation of the weathering performance of basecoat/clearcoat automotive paint systems by electrochemical properties measurements

Tahmassebi, N.; Moradian, Siamak; Mirabedini, S.M.

doi:10.1016/j.porgcoat.2005.08.004

Cited by 35 publications

(11 citation statements)

References 22 publications

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“…Weathering factors are those that are applied to the coating by weathering (or climate), and cause alteration in chemical structure (Nguyen et al, 2002 a;, Bauer, 1982, affecting various aspects of the coating properties such as physical (Osterhold & Patrick, 2001), mechanical (Tahmassebi & Moradian,2004;Nichols et al, 1999;Gregorovich et al, 2001;Nichols & Darr, 1998;Nichols,2002;Skaja, 2006) and electromechanical (Tahmassebi et al, 2005) properties. The severity of degradation caused by weathering factors depends strongly on climatic condition.…”

Section: Weathering Factorsmentioning

confidence: 99%

Effects of Environmental Conditions on Degradation of Automotive Coatings

Mohseni¹,

Ramezanzadeh²,

Yari³

2011

New Trends and Developments in Automotive Industry

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Section: Weathering Factorsmentioning

confidence: 99%

Effects of Environmental Conditions on Degradation of Automotive Coatings

Mohseni¹,

Ramezanzadeh²,

Yari³

2011

New Trends and Developments in Automotive Industry

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“…these factors plays a greater or lesser role depending on both the coating and the particular geographic location in which a layer is exposed. In these studies, the degradation effects of biological materials such as bird droppings and raw eggs have also been paid attention to recently [13] [25] and electromechanical properties [26]. In other words, the weathering performance anddurability of a clearcoat system indirectly reflects its mechanical and chemical stability and may cause that clearcoat to become vulnerable and fail as a result of hydrolysis, light, heat, moisture and photochemical degradations [27].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Detergents on the Appearance of Automotive Clearcoat Systems Studied in an Outdoor Weathering Test

Alsoufi¹,

Bawazeer²,

Alhazmi³

et al. 2017

MSA

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The ability to predict the weathering performance of the clearcoat system over a short period of time is essential for the design and development of coating production. Thus, the primary objective of the present study is to investigate whether it is possible to predict the weathering performance of an automotive paint system through determination of surface roughness, R a , and microhardness before and after various weathering exposure times (0, 24, 168, 336, 504, 672 hours) and when employing two different detergent materials (house-use detergent and car wash detergent). The data were analysed using a pair-sample t-Test, with 0.05 level of significance. It was found that the total net of degradation in the clearcoat level during the first 24 hours was R a ≈ 30.3 nm (for surface roughness) and 1.358 HV (for the µ-hardness) when using the house-use detergent. In contrast, it was found to be R a ≈ 4.6 nm (for surface roughness) and 1.133 HV (for µ-hardness) when using the car wash detergent. Also, increased time of weathering (up to 672 hours) increases the R a and µ-hardness values. It can therefore be concluded that the effect of house-use detergent was more severe than that of car wash detergent on the clearcoat system.

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“…Therefore, it is evident that degradation is the result of attachment or penetration of these materials to the surface of films. Recently, several attempts have been made14–16 to improve the durability and the life span of the coatings system. To achieve such goals, the surface properties of coatings have shown to be highly important.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of low surface free energy automotive clear coats: Mechanical and surface chemistry studies

Rabea

Mohseni

Yari

et al. 2012

J of Applied Polymer Sci

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This work aims at improving the surface chemistry and the mechanical properties of a commercial acrylic–melamine clear coat using a functional siliconized additive. The resistance of films against biological degradation was then investigated using pancreatin (simulated bird droppings) and Arabic gum (simulated tree gum). Variations in the surface and bulk chemical structures, as well as the thermomechanical characteristics of the clear coats at different concentrations of the additive, were investigated by a wide range of techniques inclusive of contact angle measurement, gonio‐spectrophotometery, dynamic mechanical thermal analysis (DMTA), energy‐dispersive spectroscopy, atomic force microscope, optical microscope, and attenuated totalreflectance Fourier transform infrared (ATR‐FTIR) spectroscopy. Negligible effect of additive on color change was revealed. It was shown that even at low loadings of additive it could migrate to the surface, producing hydrophobic films with very low surface free energies with water contact angle exceeding 100°. In addition, it was found by DMTA and ATR‐FTIR studies that the functional additive was covalently attached to the acrylic–melamine chains through its hydroxyl groups. However, phase separation was observed at high concentrations of additive, leading to reduced crosslinking density. The clear coat resistance against pancreatin and Arabic gum was improved using optimum concentrations of the additive. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Evaluation of the weathering performance of basecoat/clearcoat automotive paint systems by electrochemical properties measurements

Cited by 35 publications

References 22 publications

Effects of Environmental Conditions on Degradation of Automotive Coatings

Effects of Environmental Conditions on Degradation of Automotive Coatings

The Effect of Detergents on the Appearance of Automotive Clearcoat Systems Studied in an Outdoor Weathering Test

Fabrication of low surface free energy automotive clear coats: Mechanical and surface chemistry studies

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