2731 High Corrosion Resistant Zinc-Nickel Black Trivalent Chromating Passivation
Name：2731 High Corrosion Resistant Zinc-Nickel Black Trivalent Chromating Passivation
1.Contains no silver and produces a clear uniform jet-black. The color stability is perfect and avoids fading of silver-containing chromating processes after long term in stock.
2.Nanometer sealer is directly added to chromating solution and improves the corrosion resistance even higher than conventional hexavalent chromating. It can last 200 hours in ASTM B-117 neutral salt spraying test without white rusts and 1000 hours without red rusts. The corrosion resistance and appearance keep the same after heat treatment. It’s especially good for auto part industry.
3.Easy for operation and maintenance. Stable solution and long life time.
4.The conversion film exhibits high-hardness high resistance to scratch. The abrasion resistance is superior to Hexavalent chromating processes.
5.Contains no Cr(Ⅵ) and oxidant, environmentally friendly products.It has been accepted by importers from European and America too.
2731A Zinc-Nickel black trivalent chromating make up: 100-150ml/L.
2731B Zinc-Nickel black trivalent chromating corrective: 20-50ml/L.
2731A Zinc-Nickel black trivalent chromating corrective: 1.5-2L/10000dm2.
2731B black Zinc-Nickel trivalent chromating replenisher: 5-7L/10000dm2.