I. The Corrosion Effect of Acetic Acid on Pure Titanium
Pure titanium is a highly reactive metallic material that reacts with many acidic substances, including acetic acid. Hydrogen ions in acetic acid can combine with oxygen atoms on the surface of pure titanium to form a protective titanium oxide film. However, when the acetic acid concentration is too high, this protective film is destroyed, exposing the pure titanium to the acetic acid and leading to corrosion.
II. Reasons for Acetic Acid Corrosion of Pure Titanium
The main reason for acetic acid corrosion of pure titanium is the destruction of the titanium oxide protective film. Hydrogen ions in acetic acid can react with titanium oxide to form water and acetate ions, releasing electrons. These electrons can form a hydrogen ion layer on the surface of pure titanium, causing corrosion.
III. How to Prevent Acetic Acid Corrosion of Pure Titanium
To prevent acetic acid corrosion of pure titanium, we can take the following measures:
1. Control the acetic acid concentration. Appropriately controlling the concentration of acetic acid, avoiding excessive levels, can reduce the damage to the titanium oxide protective film.
2. Choose an appropriate purity. Choosing high-purity titanium reduces impurities and enhances its corrosion resistance.
3. Add surface treatment. Adding a protective film, such as a plating or electrochemical oxidation, to the surface of pure titanium can improve its corrosion resistance.
Regarding material selection, the ASTM B265 standard specifies that industrial pure titanium (Gr2) is suitable for acetic acid environments with temperatures below 150°C and concentrations below 40%. For more demanding conditions, titanium-palladium alloys (such as Gr7 and Gr11) should be used. The addition of palladium shifts the self-corrosion potential of the alloy by 200-300 mV, significantly improving the stability of the passivation film.
Contact information:
Tel: +86-0917- 3664600
Whatsapp: +8618791798690
