Rust-proof and wear-resistant treatment of convenience store metal shelves is crucial to the service life, aesthetics and safety of the shelves. Relevant industry standards regulate its treatment process and performance indicators to ensure that the shelves can be used stably and reliably in various environments.
Coating appearance standard
The appearance of the shelf coating should be flat and smooth. For a full set of convenience store metal shelves, there should be no defects such as pinholes, bubbles, cracks, bottom biting, color penetration, missing coating, sagging, partial peeling, etc. At the same time, the color of the coating should be basically consistent with the selected sample or color plate to ensure the coordination and aesthetics of the overall appearance of the shelf and create a good shopping environment for the convenience store.
Coating thickness standard
According to GB/T 13452.2-2008 "Determination of film thickness of paint and varnish", the coating thickness must meet the design requirements. Generally speaking, in order to achieve better rust-proof and wear-resistant effects, the thickness of electrostatic spraying is usually required to be ≥60μm. Sufficient coating thickness can effectively isolate air, moisture and metal substrate from contact, thereby enhancing rust prevention performance, while also improving wear resistance and reducing wear on the shelf surface caused by cargo handling and other operations in daily use. Non-destructive methods such as magnetic method (applicable to steel substrates) and eddy current method (applicable to non-ferrous metal substrates) can be used for measurement, as well as destructive methods such as microscopy.
Coating hardness standard
GB/T 6739-2022 "Paint and varnish pencil method for determination of paint film hardness" specifies the method of measuring paint film hardness by pencil method. For convenience store metal shelves, the coating hardness is usually required to be no less than pencil hardness H level. Through this standard test, it can be ensured that the coating has a certain hardness, can withstand friction and collision in daily use, is not easy to scratch, thereby maintaining the integrity of the shelf surface, and thus ensuring the long-term effectiveness of the anti-rust function.
Coating adhesion standard
The adhesion between the coating and the metal substrate is crucial. If the adhesion is poor, the coating is easy to fall off, and the anti-rust and wear-resistant effects will be greatly reduced. The coating adhesion can be tested by methods such as scratch test and pull-out test. Generally, the electrostatic powder spraying adhesion is required to reach ISO grade ≥1 or meet the relevant requirements of GB 9286 standard. During the production process of a full set of convenience store metal shelves, the surface treatment process must be strictly controlled to ensure that the coating can be firmly attached to the substrate to withstand various physical effects in daily use.
Phosphating treatment standard
GB/T 6807-2001 "Technical conditions for phosphating treatment of steel workpieces before painting" is applicable to the quality inspection of phosphating treatment of shelf components before painting. In the production of convenience store metal shelves, steel shelves are usually phosphating to improve the adhesion and corrosion resistance of the coating. The standard stipulates the process parameters, film weight, film appearance and other aspects of phosphating treatment. For example, the phosphating film weight must meet the corresponding requirements, and the film appearance should be uniform, dense, and without obvious defects, etc., providing a good foundation for subsequent coating treatment.
Weather resistance standard
The shelves will be affected by external environmental factors during use, such as ultraviolet radiation, high temperature, high humidity, etc., so they need to have good weather resistance. Relevant standards stipulate that accelerated aging tests can be conducted on coatings by simulating natural environmental conditions, such as salt spray tests in accordance with GB/T 10125, which generally require no rust for ≥1000 hours under this standard. For a full set of convenience store metal shelves, weather resistance tests can ensure that the coating does not show serious fading, powdering, blistering, etc. in different seasons and environmental conditions, and maintain stable anti-rust and wear resistance.
Other related standards
In addition to the above main standards, there are some standards involving other properties of shelf coatings. For example, GB/T 9278 stipulates the method for determining the drying time of the coating at a specified temperature, and GB/T 1740-2007 stipulates the test method for the moisture and heat resistance of the coating. These standards regulate the performance of shelf coatings from different angles, which helps to comprehensively improve the anti-rust and wear resistance of convenience store metal shelves, as well as the overall quality and service life.
The anti-rust and wear-resistant treatment of convenience store metal shelves must strictly follow relevant industry standards, and all aspects of the coating, including appearance, thickness, hardness, adhesion and weather resistance, must be strictly controlled and tested. Only in this way can we ensure that the whole set of convenience store metal shelves have good anti-rust and wear-resistant properties in actual use, provide long-term, stable and reliable cargo storage support for convenience stores, while also maintaining the beauty of the shelves and enhancing the overall image of the convenience store.
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