"From CNC Maching to Surface Mastery--Where Precision Meets Unbreakable Beauty."
Why do global customers choose our metal parts surface treatment?
"surface work" determines product life and value!
Whether it is precision parts, complex structural parts or high-load functional parts, we use 20+ kinds of international standard processes to endow metals with corrosion resistance, ultra-wear resistance, high hardness, strong adhesion and other core properties. At the same time, we create mirror-grade finish and high-end texture appearance to help your products stand out in the market competition!
What is the surface treatment of metal parts?
The metal surface treatment process is to modify the surface of metal materials by physical, chemical or mechanical methods to improve their performance and appearance. These processes play a key role in improving the corrosion resistance, wear resistance, electrical conductivity and aesthetics of metals, and are widely used in machinery manufacturing, automotive industry, construction engineering, electronic appliances and other fields.
Metal machining parts surface treatment process types
There are many kinds of metal surface treatment processes, mainly divided into chemical surface treatment, electrochemical surface treatment, modern surface treatment and mechanical surface treatment.
1. Chemical surface treatment
The metal surface treatment process is to modify the surface of metal materials by physical, chemical or mechanical methods to improve their performance and appearance. These processes play a key role in improving the corrosion resistance, wear resistance, electrical conductivity and aesthetics of metals, and are widely used in machinery manufacturing, automotive industry, construction engineering, electronic appliances and other fields.
The bluing and blackening process rapidly oxidizes the surface of the steel products to form a dense oxide film (mainly Fe₃O₄), which improves the rust resistance of the steel. The oxide film can block the direct contact between oxygen and moisture in the air and the metal matrix, and reduce the occurrence of corrosion. There are two kinds of blackening treatment: alkaline heating blackening and normal temperature blackening, of which alkaline heating blackening is suitable for low carbon steel, such as A3 steel, and can obtain better anti-rust effect; Room temperature blackening process is simple, but the effect of low carbon steel is not as good as alkaline blackening.
Pickling uses an acid solution (such as sulfuric acid, hydrochloric acid, etc.) to remove the oxide and rust on the metal surface, exposing a clean metal matrix and providing good surface conditions for subsequent treatment. The surface activity of the metal after pickling is high, which is conducive to the adhesion of the coating and coating, but attention should be paid to avoid excessive corrosion and environmental protection problems of waste liquid treatment.
Electroless plating is the deposition of a layer of metal or alloy coating on a metal surface by chemical reduction reaction without the application of an external current. Common electroless nickel plating, electroless silver plating, etc., can form a uniform coating on the workpiece with complex shape or blind holes, has good corrosion resistance and electrical conductivity, and is widely used in electronics, electroplating and other fields.
TD treatment and QPQ treatment are used to infiltrate carbon, nitrogen and other elements on the metal surface to form a high hardness compound layer to improve the hardness and wear resistance of the surface. QPQ treatment, that is, quenching-polishing-requench comprehensive treatment, can form a dense composite infiltration layer on the surface, improve corrosion resistance and fatigue strength, often used in high-demand mechanical parts.
2. Electrochemical surface treatment
Electroplating is the process of plating a layer of metal or alloy on a metal surface using the principle of electrolysis to improve its corrosion resistance, hardness and aesthetics. Common electroplating metals are zinc, nickel, chromium and so on. Zinc plating is mainly used for anti-corrosion of steel parts, widely used in construction, automobile and other fields; Nickel plating has good wear resistance and decoration. Chromium plating is divided into decorative chromium plating and hard chromium, the former is used to improve the surface brightness, the latter is used to enhance wear resistance and hardness.
Anodizing is the formation of an oxide film on the surface of a metal as an anode through an electrochemical reaction in an electrolyte solution. The anodizing of aluminum and its alloys is the most widely used, and the oxide film has good corrosion resistance, wear resistance and decoration, and can obtain a variety of colors by dyeing, which is widely used in the appearance treatment of buildings, furniture and electronic products.
3. Modern surface treatment
Physical vapor deposition (PVD) is a technology in which material atoms or molecules are physically deposited on the surface of the substrate under vacuum conditions to form a thin film. PVD film has the advantages of high hardness, low friction coefficient, high temperature resistance, etc., and is widely used in the surface strengthening and beautification of tools, molds, decorative parts, etc.
Chemical vapor deposition (CVD) is a method of forming a solid film layer on the surface of the substrate by gaseous chemical reaction, which can prepare high purity and high performance ceramic or metal films. CVD technology is often used to manufacture hard coatings and high-temperature and corrosion-resistant components, and has important applications in aerospace, electronics, cutting tools and other fields.
4. Mechanical surface treatment
Sandblasting and shot blasting use high-speed sand streams or projectiles to impact metal surfaces, removing oxide, burrs and impurities while increasing surface roughness to improve the adhesion of the coating. Sandblasting is suitable for complex shapes and small workpieces, while shot blasting is often used for large workpieces.
Grinding and polishing reduce the surface roughness through mechanical friction, obtain a smooth and bright surface, and improve the beauty and performance of the workpiece. Polishing is usually used for preliminary processing, polishing is used for finishing, and is widely used in decorative parts, instruments and other fields.
Why do metal parts need surface treatment?
Anti-corrosion : metal parts are prone to chemical reaction and corrosion in humid, acidic, alkaline, salt spray and other environments, leading to material performance decline and even failure. By surface treatment, a protective layer can be formed on the metal surface to slow down or stop the corrosion process. For example, electroplating, spraying, hot dip galvanizing and other methods can add a layer of anti-corrosion material to the surface of the metal, forming a barrier that prevents oxygen, moisture or chemicals from coming into direct contact with the metal .
Improve wear resistance : metal materials are often subjected to friction, wear, impact and other effects in the working process, surface treatment can improve wear resistance by hardening the surface, reduce the friction coefficient and other ways to extend the service life of parts. For example, surface hardening, laser hardening and other methods can harden the metal surface and improve the wear resistance .
Improve surface hardness : The hardness of some metal materials is not high enough to meet the needs of high-strength applications. Surface treatment can significantly improve the surface hardness without changing the properties of the material matrix. For example, carburizing and nitriding treatments can spread carbon or nitrogen atoms to the surface of the metal, forming a hard layer.
Beautify the appearance : Through surface treatment can make the appearance of metal parts more beautiful. For example, electroplating, spraying and other methods can provide various colors and protective layers for metals, enhancing their beauty and corrosion resistance .
Our core process, for your metal parts "plating" on the core competitiveness
Nano electroplating technology : covered with uniform dense protective layer, salt spray test life increased by 200%, suitable for extreme environment such as automobile, ocean engineering.
Anodizing treatment : put on "armor" for aluminum, anti-corrosion + insulation + wear-resistant three-in-one, ideal choice for precision electronic components and instrument casings.
Vacuum nitriding treatment : 0.1 micron level infiltration layer control, surface hardness of 1200HV, commonly used in medical instruments, gear transmission parts, mechanical equipment, hydraulic tools zero deformation strengthening program.
PVD ion coating : titanium plating/chrome plating/multi-color coating, both hard wear resistance and metallic streamline texture, high-end consumer electronics, luxury components preferred.
Aesthetics & clean process: industrial parts can also be "at a glance"
Mirror electrolytic polishing : Ra≤0.01μm ultra-smooth surface, completely eliminate the hidden danger of bacterial residue, food machinery, pharmaceutical equipment compliance choice.
Color passivation treatment : 72-hour salt spray protection + custom colors such as blue purple/golden yellow/dazzling color, so that industrial parts become brand visual symbols.
Successful case：We made the value of these customers' products skyrocket
Our Steel Anvil is made of high-strength stainless steel and high-speed steel. After heat treatment, it is required to have wear resistance and toughness at the same time. It is applied to high-strength hydraulic tools, but it still cannot meet the user's service life requirements. And our customer's hydraulic tools are also very popular in the market, sales have greatly increased.
Anvil just as Machined+Heat treatment Anvil with CrN surface treatment after heating
Other surface treatment case?
Aluminum with Anodized color Aluminum with Conductive Oxide Aluminum as machined
Alloy steel with Blacken Steel with Zinc Plating Enclosure with Sandblast black
Hard anodizing Housing CNC panel with Copper plating Coffe burr with Titanium coating
Application of metal parts surface treatment process:
Through metal surface treatment, the corrosion resistance, wear resistance, aesthetics and functionality of the material can be improved. In terms of improving corrosion resistance, the process of electroplating, galvanizing, phosphating and coating anti-corrosion coating is used to form a protective film on the surface of the metal to prevent the erosion of corrosive media. For example, automobile parts and construction steel components are galvanized to significantly extend their service life. In order to enhance wear resistance, hard chromium plating, electroless nickel phosphorus alloy plating and surface hardening are used to improve the hardness and wear resistance of the metal surface. This is widely used in moving parts such as shafts, gears and molds in mechanical manufacturing, effectively extending the service life of the equipment.
In terms of improving the appearance, through polishing, drawing, anodizing, painting, powder and other processes, the color, texture and texture of the metal surface can be changed, and the appearance quality and added value of the product can be improved. For example, the metal shell of mobile phones and laptops is anodized to show a variety of colors and excellent hand feel. In order to improve electrical and thermal conductivity, electroplating of high conductive metals such as silver and copper can improve electrical conductivity, and can be used in electronic components, electrical connections and other fields. At the same time, the surface treatment improves the thermal conductivity of the metal, which is used in radiators, electronic cooling systems, etc. In addition, the metal surface treatment is also used to meet special functional requirements. By using micro-arc oxidation technology, ceramic film can be formed on the surface of aluminum alloy, which significantly improves the surface hardness, wear resistance and heat resistance, and is applied to high demand fields such as aerospace and military equipment.
You'll get more than just craft when you choose us
✅ we have our own testing laboratory : hardness tester, metallograph, salt spray box and other equipment quality control, data report real-time sharing.
✅ We have industry customized program : automotive/medical/electronics/energy/and other 9 fields of exclusive process database, accurately match the needs.
✅ 7×24 hours response : from drawing evaluation to batch delivery, the professional team escorted the whole process, and the delivery time was shortened by 30%.
✅ Environmental compliance protection : complete RoHS/REACH certification, support global export standards.
[Xi an Hi-Precision] -- Not only CNC machining experts, but also metal performance transformation master!