Hard Chrome Plating
HVOF Thermal Spray Coating
Laser Cladding
Ceramic Coating
Nitriding
Hard chrome plating increases the hardness, durability and corrosion resistance of a surface while also creating a shiny and smooth surface that is easier to clean. It’s the most common coating process for cylinder rods which is suitable for bulk production. Through precise bath chemistry and current flow control, we can deposit the right thickness of chrome plating for piston rods, normally, 20, 30, 50 microns, or as per customer’s special requirement. The chrome hardness is more than HV850 and NSS salt spray test reaches over 200 hours, rating 9-10.
HVOF thermal spray coating process is widely used for products of harsh environments, especially for cylinder rods in coal mining and offshore projects. To increase wear resistance, corrosion resistance and high temperature resistance, there are several different coating materials like CrC-NiCr, Tungsten Carbide, Inconel 625, etc. It can perfectly instead hard chrome plating. But the production efficiency is comparatively lower because the spray speed is lower and only 1 piece of rods can be coated each time, furthermore, it’s more difficult to do the grinding and polishing because of higher hardness.
Laser cladding uses a high energy laser as a heat source, metal alloy powder as welding material, through the laser and alloy powder synchronous action on the metal surface to quickly melt to form a molten pool, and then rapid solidification to form a dense, uniform and thickness controllable metallurgical bonding layer. Laser cladding is currently the most advanced welding method used for reconditioning worn components and improving their surface characteristics and extending the product life of hydraulic cylinder rods in marine, mining, oil and gas industries. Reconditioning of hydraulic piston rods by laser cladding presents a great alternative to other repair methods such as chrome plating or metal spraying.
Ceramic coating is one of thermal spray coating process which is widely used for cylinder rods for water conservancy dams. The surface of the piston rods for hydraulic cylinders is one of the critical points in all hydraulic installations. The characteristics of ceramic coating are hardness more than HV850, roughness 0.2, coating thickness 0.3mm, bond strength more than 45Mpa, porosity less than 3.5%, and salt spray test result reaches more than 3000 hours. It can also be equipped with built-in positioning stroke sensor for hydraulic cylinders.
Nitriding is a case hardening process that depends on the absorption of nitrogen into the steel. All machining, stress relieving, as well as hardening and tempering are normally carried out before nitriding and oxidation process after nitiriding. The parts are heated in a special container through which ammonia gas is allowed to pass. Materials 42CrMo4, 38CrMoAl, 41CrAlMo7-10 are the most common nitriding steel, the surface hardness reaches HV950-1100, Min. effective depth is 0.3mm. The advantage of nitriding is mainly the reduced distortion behavior and still gives a high surface strength and ductile core. Nitriding can also increase the corrosion resistance of a component. Typical application is cylinder tubes and rods for metal recycling equipments.
Piston Rod Assembly
Tungsten Carbide Coating Cylinder Rods
Laser Cladding Piston Rods
Cr2C3-20NiCr Coating Rods
Induction Hardened Piston Rods
Hydraulic Cylinder Piston Rods/Hard Chrome Plated Rods
22/12
04/12
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