Titanium Rod Surface Treatment Technology

As an important profile of titanium alloy, the surface condition of titanium rods directly affects the corrosion resistance, mechanical compatibility and subsequent processing adaptability of products. The surface of untreated  titanium rods  is prone to oxide scale, burrs, oil stains, micro-defects and other problems, which will reduce their service reliability and service life.

 

 

Mechanical surface treatment can optimize surface morphology and removes impurities through physical action without changing the chemical composition. It shows the significant advantages of convenience, low cost, high efficiency and no chemical pollution. It is suitable for scenarios of controlling surface roughness and rapid rust and burr removal.

 

1. Grinding and Polishing Treatment

It is a commonly used treatment and has the stages such as rough grinding, fine grinding and polishing. Its core purpose is to remove oxide scale and burrs and optimize roughness. It is adopted for high-precision fields such as medical devices. It is necessary to control grinding parameters to avoid secondary oxidation and clean residual abrasives after treatment.

 

2.Sandblasting Treatment

It uses compressed air to spray abrasives on the surface of titanium rods at high speed to remove impurities. It can form a rough surface to improve adhesion. It is mostly used for coating and electroplating pretreatment, including dry sandblasting and wet sandblasting. The key is to control abrasive particle size and spraying pressure.

 

3. Barrel Finishing Treatment

It is suitable for small-sized, batch titanium rods and blanks. It uses a barrel finishing machine to make titanium rods rub against abrasives, so as to remove minor defects and refine roughness. Its advantages are simple operation, high automation and low cost, and it is often used as pretreatment for fine processing.

 

4. Centerless Grinding Treatment

It is used for high-precision processing of titanium rods and correcting straightness. This is suitable for precision parts and medical device fields. After treatment, the diameter accuracy can be controlled within ±0.01mm. The disadvantage is the high cost of the equipment and processing, so it is not suitable for mass production of low-precision titanium rods.

 

 

 

1.Pickling Treatment

It is a widely used pretreatment method, which uses a hydrofluoric acid-nitric acid mixed solution to dissolve the dense oxide scale on the surface and remove impurities. The process parameters are adjustable. After treatment, the surface is clean, the roughness is and the corrosion resistance is improved. It is necessary to treat toxic waste gas and wastewater, and strictly control parameters to prevent pitting corrosion.

 

2. Alkaline Washing Treatment

It is used to remove surface oil stains and loose oxide scale, and can be used as pretreatment for pickling. A 5%-15% sodium hydroxide solution is commonly used, with process parameters of temperature 60-100℃ and time 10-20min. Its advantages are simple operation, low cost and low pollution. The disadvantages are that it cannot remove dense oxide scale, the roughness after treatment is high, and timely rinsing is required.

 

3. Anodizing Treatment

It forms a dense oxide film through electrochemical action to improve corrosion resistance and wear resistance, suitable for high-end fields. The electrolyte and electrolysis parameters determine the film performance. The film layer after treatment has tight bonding and can be used as the bottom layer of coatings. The disadvantages are high equipment and processing cost, electrolytic wastewater generation, and it is not suitable for mass processing of low-precision products.

 

4. Electroless Plating Treatment

It does not require an external power supply. Metal ions are deposited on the surface of titanium rods through reducing agents, and pretreatment activation is required. Electroless nickel plating is the most widely used. Its advantages are uniform treatment, suitability for complex shapes, batch processing and simple equipment. The disadvantages are heavy metal wastewater pollution, high cost and limited plating thickness (1-10μm).

 

 

 

Mechanical and chemical treatments for titanium rods have their own advantages and disadvantages and are applicable to different scenarios.

Mechanical treatment focuses on optimizing surface morphology and dimensional accuracy, with high efficiency, low cost and no pollution.However, it cannot change the surface chemical composition and has limited improvement on properties such as corrosion resistance and biocompatibility.

 

Chemical treatment can change the surface chemical composition and microstructure, greatly improving corrosion resistance, wear resistance and other properties, with uniform and precise treatment. However, the cost is higher, some processes will cause pollution, and the requirements for equipment are higher. In actual production, a single process is difficult to meet the performance requirements of high-end titanium rods, so the two treatment methods are often used in combination.

 

Ruihang Group mainly produces Titanium and Titanium Alloy products,including bars,plates,wires,pipes,forgings etc. We have the sufficient inventory on hand for your requests. For more details,please reach us to the email: Sam.Rui@bjrh-titanium.com