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Causes and Solutions for Uneven Chemical Polishing of Titanium Alloys
2026-04-08
Chemical polishing is a common process used to achieve a bright surface in titanium alloy surface treatment. However, uneven polishing is a frequent issue in actual production—it not only affects the workpiece's appearance but also may compromise its subsequent performance. Based on the process characteristics of titanium alloy chemical polishing, this article sorts out the common causes of uneven polishing and corresponding operational standards, providing practical guidance for on-site operations.
I. Main Causes of Uneven Polishing
Chemical polishing works by reacting the polishing agent with the oxide film on the titanium alloy surface to eliminate micro-irregularities. When the reaction rate is unevenly distributed on the workpiece surface, local over-polishing or inconsistent polishing degrees will occur. Common influencing factors include:
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- Inconsistent Surface Conditions: Residual oil stains, uneven oxide film thickness, or inadequate pre-treatment on the workpiece surface can lead to varying contact degrees between the polishing agent and the substrate, resulting in different reaction rates.
- Insufficient Polishing Agent Fluidity: If the workpiece remains stationary during immersion, the polishing agent cannot fully contact the surface, which can easily cause regional unevenness.
- Improper Process Parameter Control: Unstable polishing time, temperature, and operation methods can also cause fluctuations in surface quality.
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II. Key Operational Points to Solve Uneven Polishing
In response to the above causes, a standardized operation process is the key to ensuring uniform polishing results. You can follow these specific steps:
1. Pre-Treatment
Thoroughly degrease the titanium alloy workpiece before polishing to ensure no oil, dust, or residual oxide scale remains on the surface. A clean substrate is the foundation for achieving uniform polishing results.
2. Polishing Operation
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- Use a fast polishing agent suitable for titanium alloys. This type of product is usually applicable to all types of titanium alloys and performs particularly well on workpieces with thick oxide films.
- Use the polishing agent undiluted—do not add water.
- Fully immerse the workpiece in the polishing agent, control the operating temperature within the range of 20–35℃, and adjust the immersion time between 30 seconds and 6 minutes according to the workpiece's condition.
- Move the workpiece slowly and continuously during immersion to keep the polishing agent flowing and updating on the surface, avoiding local over-reaction or under-reaction.
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3. Post-Treatment
Immediately take out the workpiece after polishing, rinse it thoroughly with clean water to remove residual polishing solution, and then dry it. This prevents water stains or residues from affecting the surface quality.
III. Key Notes
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- Keep the Polishing Agent Pure: Avoid bringing water to the workpiece before immersing it in the polishing agent, as this will dilute or contaminate the polishing solution and affect reaction stability.
- Continuous Turning: Continuously moving the workpiece midway is an important step to ensure uniformity—static immersion is not recommended.
- Safety Protection: Avoid direct contact between the polishing agent and skin or eyes during operation. If contact occurs accidentally, rinse immediately with plenty of clean water.
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IV. Summary
In most cases, the problem of uneven chemical polishing of titanium alloys can be effectively improved by standardizing pre-treatment, strictly controlling polishing process parameters, and maintaining the proper use conditions of the polishing agent. Using a suitable polishing agent and following the process of pre-treatment → dynamic immersion → timely cleaning, and drying can yield titanium alloy workpieces with uniformly high surface quality.
In actual production, it is recommended to conduct small-batch test polishing according to the specific condition of the workpieces to confirm the optimal process window.