Corrosion prevention refers to taking certain protective measures against different chemical substances to protect equipment and items from damage caused by chemical corrosion. In industrial production, many chemical liquids are corrosive to equipment, so anti-corrosion measures need to be taken to protect the equipment. As an excellent corrosion-resistant material, titanium is widely used in the manufacturing of chemical equipment, biomedical devices, marine engineering, aerospace and other fields. The corrosiveness of titanium materials varies with different acidic and alkaline liquids, therefore, the selection of titanium materials needs to be based on the characteristics of different liquids. Below, we will introduce several different acidic and alkaline liquids, as well as the types of titanium materials that need to be used.
Acidic liquid refers to a liquid with a pH value less than 7, which has strong corrosiveness to metals such as steel and copper. Titanium material has outstanding acid resistance and can resist corrosion from various acidic liquids. Different acidic liquids have different choices for titanium materials. The following are several common acidic liquids: (1) nitric acid. Nitric acid is a strong oxidant that can cause corrosion in most metal materials. However, titanium materials have strong corrosion resistance to nitric acid and can be treated with pure titanium or Ti-0.3Mo-0.8Ni alloy for corrosion prevention. Among them, Ti-0.3Mo-0.8Ni alloy has better corrosion resistance and is widely used in the manufacture of nitric acid production equipment. (2) Sulfuric acid is a common acidic liquid that corrodes most metal materials. However, titanium materials have good corrosion resistance to sulfuric acid, so pure titanium or Ti-0.3Mo-0.8Ni alloy is often used in the manufacture of sulfuric acid equipment. (3) Hydrochloric acid is an inorganic acid that is highly corrosive to many metallic materials. However, titanium materials have good corrosion resistance to hydrochloric acid, so pure titanium or Ti-0.3Mo-0.8Ni alloy is often used in the manufacture of hydrochloric acid equipment.
Alkaline liquids refer to liquids with a pH value greater than 7, which can also corrode many metal materials. Different alkaline liquids have varying corrosiveness towards titanium materials. The following are several common alkaline liquids: (1) Sodium hydroxide is a strong alkaline liquid commonly used for cleaning and corroding metal surfaces. Titanium materials have good corrosion resistance to sodium hydroxide and are often made of pure titanium or Ti-0.3Mo-0.8Ni alloy. (2) Potassium hydroxide is also a strong alkaline liquid with strong corrosiveness. In contrast, titanium materials have poor corrosion resistance to potassium hydroxide, so Ti-0.3Mo-0.8Ni alloy is often used for manufacturing. (3) The titanium material in cyanide solution usually has extremely strong toxicity and corrosiveness, so it is crucial to use suitable titanium materials for anti-corrosion treatment. In cyanide solutions, commonly used titanium materials include TA1, TA2, TA9, etc. These titanium alloys have excellent corrosion resistance and mechanical properties, which can effectively prevent corrosion in cyanide solutions.
In short, titanium material is an excellent corrosion-resistant material widely used in many fields such as chemical equipment, medical devices, and marine engineering. When selecting titanium materials, it is necessary to choose the appropriate type of titanium material based on the characteristics of different liquids to ensure the long-term stable operation of the equipment.
