Automotive Coating Quality Identification

Automobile coating refers to a layer of protective coating applied on the surface of the car. Its main function is to protect the car surface from erosion by the external environment, and it also plays a role in beautifying the appearance of the car. Automotive coatings mainly consist of three parts: primer, topcoat and clearcoat.
automotive coatings also include adhesives between the substrate and primer, adhesives between topcoat and clearcoat, and interface agents between each layer of coating. These adhesives and interface agents improve coating adhesion and durability. The composition of
automotive coating is a complex system composed of multiple ingredients. Each layer of coating has its own unique function, and together they form a complete protection system for automotive coatings. In the automobile manufacturing process, the choice of coating and the mastery of coating technology are very important. They directly affect the appearance and service life of the automobile.
In automobile coating quality appraisal cases, Zhongke Testing can provide automobile coating quality appraisal services.

1. According to different classifications of painting objects: new car original paint, car repair paint.
2. According to the bottom-up classification of automotive coatings: automotive primer, automotive mid-coat, automotive primer, automotive topcoat, and automotive refinishing paint.
3, classified according to coating method: automotive electrophoretic paint, automotive liquid spray paint, automotive powder coating, automotive special coating.
4, classified according to the use of parts in automobiles: automobile body paint, automobile cargo compartment paint, corrosion-resistant coating for automobile wheel frames and other components, automobile engine parts paint, automobile chassis coating, automobile interior decoration coating.

HG/T 5367.4-2020 Coatings for rail transit vehicles Part 4: Fire retardant coating
HG/T 5367.1-2018 Coatings for rail transit vehicles Part 1: Water-based coatings
HG/T 5367.3-2020 Coatings for rail transit vehicles Part 3: Anti-skid coating
GB/T 1720-2020 Paint film circle test
GB/T 21353-2008 Paint film algae resistance determination method
GB/T 1740-2007 Paint film moisture and heat resistance determination method
GB/T 1732-2020 Paint film impact resistance determination method
GB/T 1741-2020 Determination of mold resistance of paint film
HG/T 3344-2012 Determination of water absorption of paint film
GB/T 1728-2020 Determination of drying time of paint film and putty film
0GB/T 6739-2022 Paint and varnish Pencil method for determination of paint film hardness
1GB/T 1731-2020 Determination of paint film and putty film flexibility
2GB/T 37361-2019 Determination of paint film thickness Ultrasonic thickness gauge method
3HG/T 3330-2012 Method for determination of breakdown strength of insulating paint films
4GB/T 21866-2008 Method for determination of antibacterial properties and antibacterial effects of antibacterial coatings (paint films)
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Due to business needs, a company purchased 8 cars from a car sales company. After negotiation, the total price was 2.38 million. However, after one year of use, the paint on these cars began to peel off, affecting their appearance. As a result, the company claimed compensation from the car sales company, but the car sales company refused to take responsibility. As a result, the buyer's company filed a lawsuit in court and requested to terminate the car purchase contract between the two parties.
was entrusted by the court to conduct an appraisal and analysis on whether there is a quality problem in the peeling off of the car coating involved in the case.
appraisal analysis results:
appraisal analysis expert group analyzed the relevant information and current status of the car coating involved in the case The site survey was discussed and comprehensive quality and technical analysis was conducted, and the following suggestions and conclusions were made:
automotive coating materials have certain defects and are prone to rust when exposed to water, resulting in blistering and peeling. It is believed that there are quality issues with the