Abstract
The technology and methods of testing the properties of varnish coatings used in motor vehicles are constantly and successfully developed. However, in the case of automotive varnish renovation coatings used in the repair of car bodies, the problem of fitting the quality of these coatings to the quality and current condition of the coating applied to undamaged vehicle components is not definitely solved. The main goal of the research was to determine the thickness and gloss distribution of the varnish coatings. The thickness and gloss of the varnish coating on the entire body of the vehicle were measured. Classical methods of assessing these properties were used. Defects in the renovation coating were also simulated, to show their negative impact on the varnish quality. The performed tests allowed for development of a procedure and algorithm for evaluation of the quality of the car’s renovation coating after the repair of the car body. The proposed procedure, expressed with the presented algorithm, allows to fit the obtained renovation coating to the quality and condition of the coating manufactured in factory on the car body in the range of its thickness up to 270 µm and gloss in the range of 5–90 GU. The developed procedure for the assessment of renovation coatings can be used in workshops that repair vehicle bodies. This will allow to improve the quality of renovation coatings and bring their properties, such as thickness or gloss, closer to those applied to the vehicle’s body at the factory.
Highlights
The varnish coating used in motor vehicles has two main functions, the protection of the vehicle body against corrosion and the decorative one that affects the visual aspect of the entire vehicle [1,2]
In the first stage of research on renovation coatings, the varnish thickness was measured at 6 measuring points
The average thickness of most renovation coatings is approximately 134 μm. This value is in line with the customary standard for the thickness of automotive varnish. This is a conventional term, because the reference thickness of renovation varnish coatings is not determined by any standard
Summary
The varnish coating used in motor vehicles has two main functions, the protection of the vehicle body against corrosion and the decorative one that affects the visual aspect of the entire vehicle [1,2]. More and more people are paying attention to the protection of the environment (environmentally friendly coating materials) and cost of painting process. In the case of renovation coating, it is important to fit their condition to the coating applied to undamaged elements (coating made in factories), especially in terms of the color of the varnish coating and its gloss. It is important to maintain a thickness similar to that of the original paint applied at the factory. Too small thickness of the renovation varnish may lead to corrosion of the car body sheet. In order to fulfill its functions, the varnish coating must be made in accordance with the technological regime of a vehicle manufacturer [1]
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