A single pack that contains 96% zinc in dry film, an alternative anti corrosion performance to hot dip
Description
ZINDN is a one pack galvanizing coating that contains 96% zinc dust in the dry film and providing both cathodic and barrier protections of ferrous metals.
It can be used as not only a unique system to be an alternative anticorrosion performance to hot-dip galvanizing, but as primer in a duplex system or three-layer ZINDN coating system.
It can be applied by spraying, brushing or rolling on a clean and rough metal substrate in a wide range of atmospheric circumstances.
Cathodic protection
In electrochemical corrosion, the metal zinc and steel are in contact with each other, and the zinc with a lower electrode potential is used as the anode, which continuously loses electrons and is corroded, that is, the sacrificial anode; while the steel itself is used as the cathode, which only transfers electrons and does not change itself, so it is protected
The zinc content in ZINDN galvanizing layer is over 95%, and the purity of the zinc dust used is as high as 99.995%. Even though the galvanizing layer is slightly damaged, the iron under the zinc layer will not rust until the zinc is consumed completely, and meanwhile, it can effectively prevent the spread of rust.
Barrier protection
The special reaction mechanism makes ZINDN galvanizing layer can be further self-sealed with the passage of time after application, forming a dense barrier, effectively isolating corrosion factors, and greatly improving the anti-corrosion ability.
ZINDN combines the characteristics of two anti-corrosion properties into one, breaking through the limitation of pigment-base ratio of conventional coatings, and obtaining excellent long-term anti-corrosion ability.
95% zinc dust in the ZINDN galvanizing layer dry film, the corrosion current density is much higher than that of the zinc-rich coating
With the increase of the zinc dust in the dry film layer, the corrosion current density will increase significantly, and the electrochemical anti-corrosion ability will also increase significantly.
Advantages of ZINDN
Long-term anti-corrosion
Active + Passive dual protection properties, salt spray test up to 4500 hours, easily achieve to 25+ years anticorrosion life span.
Strong adhesion
The developed fusion agent technology fully solved the adhesion problem of high zinc dust (> 95%) in dry film. 4% mass fraction of fusion agent can firmly bond 24 times its weight of zinc dust and make it bond with the substrate and adhesion up to 5Mpa-10Mpa.
Good compatibility
ZINDN can be used as a single layer or as a two or three-layers system with ZD sealer, topcoat, silver zinc, etc., to meet customers' needs for long-lasting anticorrosion and beautiful decoration in various environmental conditions.
No cracking or falling off used in weld
ZINDN solved the industry bottleneck that galvanizing layer easily cracks and falling offer in the weld, ensures the application quality.
Easy to apply
One pack, can be applied by spraying, brushing or rolling. Does not sink to the bottom, does not block the gun, does not block the pump, conveniently applied.
Cost effective
Eco-friendly, low cost, and easy touchup compared to hot-dip and thermal spray galvanizing.
Long intervals between touch up and recoating, low cost of life cycle anticorrosion compared to epoxy zinc rich coatings.
Comparison of technical indicators
|
Item |
Hot-dip |
Thermal spray |
ZINDN |
|
Surface treatment |
Pickling and phosphating |
Sa3.0 |
Sa2.5 |
|
Application method |
Hot dipping |
Electric arc spray zinc; oxygen; B block hot spray zinc (aluminum) |
Spraying, brushing, rolling |
|
Application difficulty |
Difficult |
Difficult |
Easy |
|
On-site application |
No |
More difficult, with restrictions |
Convenient and flexible |
|
Energy consumption |
High |
High |
Low |
|
Efficiency |
Depending on the size of the hot dipping galvanizing factory |
Thermal spray 10m²/h； Arc spray 50 m²/h； |
Airless spray: 200-400 m²/h |
|
Environment and safety |
The plating solution produces a large amount of highly toxic substances, waste liquid and waste gas |
Severe zinc mist and dust are produced, causing occupational diseases |
No lead, cadmium, benzene and other harmful substances. Application is the same as painting, eliminating serious pollution. |
|
Touch up |
Difficult |
Difficult |
Easy |
ZINDN Coating System
Single Layer:
Recommended DFT: 80-120μm
Duplex system:
1.Zindn (80-120μm) +Silver sealer 30μm
2.Zindn (80-120μm) +Silver zinc (20- 30μm)
3.Zindn (60-80μm) + Powder coating (60- 80μm)
Composite coating
Zindn + Sealer + Polyurethane/Fluorocarbon/Polysiloxane
Zindn DFT: 60-80μm
Sealer DFT: 80-100μm
Topcoat DFT: 60-80μm
On-site application
Before application
After ZINDN application
Application process of ZINDN
Degreasing and decontamination
Surface oil stains should be cleaned by low-pressure spray or soft brush with a special cleaner, and all residues should be rinsed off with a fresh water gun, or treated with lye, flame, etc., and rinsed with fresh water until neutral. Small areas of oil stains can be scrubbed with solvents.
Surface treatment
Use sandblasting or electric tools and hand tools to remove the rust, protrusions, and peeling parts on the surface, especially the rusty parts, and the rough parts are smoothed by welding.
Mixture
ZINDN is a single component product. After opening the barrel, needs to be stir completely with a power tool.
Dilute ratio 0-5%; due to the difference in temperature and spray pump pressure, the actual addition of thinner is based on actual situation.
Application
Brushing and rolling: non-shedding paint brushes and roller cores are recommended, and use the criss-cross method to evenly coat to ensure good penetration, and pay attention to prevent sagging and unevenness.
Spraying: spray pump with a compression ratio of about 1:32, and keep the spray equipment clean.
Z-type nozzle is recommended, keep the spray width about 25cm, the nozzle is perpendicular to the workpiece at 90°C, and the gun distance about 30cm.
Suggest to spray by 2 coatings layers, After the surface of the first time is dry, spray the second time, reciprocate the gun 2 times, and apply to the specified film thickness according to the requirements.
