Zinc-aluminum coating:
Zinc-aluminum coating is an anti-corrosion technology that can replace galvanizing and zinc alloys. It forms a cathodic protection coating by depositing on the substrate surface through a non-electric physical process;
- The coating contains zinc and aluminum flakes bonded by a special cross-linking system;
- The combined coating performance can be increased by using a topcoat;
- The coating process does not require electricity or acid, and there is no risk of hydrogen embrittlement, which is particularly suitable for high-strength fasteners;
- It needs to be cured at a certain temperature to form a high-density functional coating;
- It does not contain any harmful metals such as hexavalent chromium, lead, mercury, cadmium, nickel, cobalt, etc.;
Zinc-aluminum coating anti-corrosion:
Using multi-layer flaky zinc powder with a thickness of 0.1~0.2μm, the diffusion path from the coating surface to the metal is much longer, and the overlapping of the thin flakes significantly improves the anti-permeability, and the corrosion delay period of the coated metal is also extended.
Therefore, the 10~13μm thin zinc-based coating system plays the role of sacrificing the cathode (the coating itself) to protect the anode substrate.
Junhe water-based zinc-aluminum micro-coating anti-corrosion coating
Junhe’s independently developed water-based zinc-based micro-coating metal anti-corrosion coating has passed the certification of Volkswagen, SAIC, and Ideal Auto, and has entered the catalog of OEMs. It is currently the only domestic brand to replace imported water-based zinc-based micro-coating metal anti-corrosion coating.
Fully automatic intelligent coating equipment currently ranks first in the domestic mid-to-high-end market.
Demonstration of the application of automotive fastener technology in photovoltaic projects
Sungrow Hainan 200MW project
Application parts: component blocks, support hoops, purlins, triangular supports, etc.
Junhe Waterborne Coatings and Trina Solar jointly drafted the standard
Junhe Zincover® zinc-rich coating new technology
Coat the surface of the metal substrate with a water-based zinc-aluminum micro-coating, the second base film thickness is 10~13μm, the neutral salt spray can be 480~720h, the go/no-go gauge meets the requirements, but the surface hardness is only 2H, which is not resistant to bumps and cannot meet the requirements of rough installation.
Add another layer of high-hardness water-based nano-ceramic coating on the surface, with a total film thickness of 11~15μm, and the surface hardness can reach 5H, which is resistant to bumps, wear and scratches, and can meet the requirements of rough installation;
The top coating can isolate air and water, is acid-resistant and alkali-resistant, and doubles the anti-corrosion ability, and the neutral salt spray time reaches >1550h, with a maximum of 2650h; at the same time, the 11~13μm film thickness go/no-go gauge meets the standard.
Zincover® 9130 Nano Ceramic Topcoat
Zincover®9130 nano-ceramic topcoat is a new type of water-based functional topcoat with independent intellectual property rights of Junhe. It is a product developed for the environment of the Western High-Speed Railway Project of the China Academy of Railway Sciences (which requires resistance to saline-alkali land, acid rain, wind and sand, and weather resistance).
It does not contain heavy metal ions, complies with RoHS standards, and complies with the requirements of China’s “Environmental Protection Law” for no heavy metal emissions. It is used as a topcoat on zinc-based coatings, hot-dip galvanizing, electro-galvanizing, blackened parts, etc. to improve the hardness of the coating, and the salt spray resistance of the workpiece is significantly improved to more than 1500h, and the longest in the laboratory is 2065h. At the same time, it solves the problems of the primer being acid-resistant, alkali-resistant, and bump-resistant.
Safe and environmentally friendly: water-based, low VOC, no heavy metals, in line with GB24409-2020\GB30981-2020\GB/T18178-2020 standards, and also meets the requirements of the EU RoHS and ELV directives.
Comparison of hot-dip galvanizing process
The film thickness of the hot-dip galvanizing process is 50~85μm (the average film thickness of Tianhe sampling is 62.6μm, and the neutral salt spray is 1056h). The surface hardness is large. The nut with a film thickness of ＞50μm needs to be enlarged. The thicker the film thickness, the more uneven it is, and the risk of enlargement is high. It is either too loose or does not pass the go/no-go gauge (poor adaptability). After enlargement, the locking force of the nut is insufficient and it is easy to loosen, and it needs to be re-tightened regularly.
The hot-dip galvanizing process will produce zinc particles, some of which are accumulated at the bottom of the tooth and some at the tip of the tooth, resulting in poor adaptability.
Anticorrosion test report
Anticorrosion test report
Anti-corrosion test report after simulated violent installation damage
Junhe Zincover coating technology: comprehensive advantages of zinc-aluminum coating + nano-ceramic topcoat
- Better anti-loosening performance, thin film thickness will not exceed the pass/stop gauge
- No need to re-tighten, low maintenance cost
- High coating hardness, easy installation
- Reduced overall cost
- Lightweight for repeated use
