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Local corrosion is one of the most dangerous forms of corrosion. Compared with stainless steel, aluminum alloy, copper alloy and nickel alloy, titanium has excellent local corrosion resistance.
⑴ resistance to seawater and chloride pitting corrosion the most prominent advantage of titanium corrosion resistance is resistance to seawater and chloride pitting corrosion.
(2) good crevice corrosion resistance, easy passivation metals (nickel, aluminum, stainless steel, titanium) may have crevice corrosion in a certain environment. However, titanium has relatively high crevice corrosion resistance.
⑶ the welded joint has good corrosion resistance. Stainless steel is often prone to intergranular corrosion, while it shows knife edge corrosion at the welding fusion line, which has become a main corrosion problem of stainless steel. Titanium will not have intergranular corrosion. In the applicable environment of base metal, its weld and heat affected zone of base metal usually have the same corrosion resistance.
(4) the corrosion fatigue of titanium with high corrosion fatigue strength is rare. The corrosion fatigue limit of titanium in seawater is equal to or slightly higher than that in air. Titanium has better corrosion fatigue resistance than common metals.
(5) stress corrosion cracking resistant titanium generally does not occur stress corrosion damage in chemical plants. Stress corrosion of titanium is usually produced only under very special conditions. Methanol containing bromine and boiling nitric acid are almost the only media that will cause stress corrosion damage of titanium. Stainless steel is sensitive to stress corrosion cracking.
(6) the surface of wear-resistant titanium has a dense oxidizing protective film, and the oxide film has the ability to grow and repair rapidly in a certain environment. Therefore, titanium has good abrasion resistance in the environment where titanium can be in a passive state, such as seawater, neutral salt solution and oxidizing acid.
The application of titanium equipment is expanding and becoming an increasingly important engineering corrosion-resistant metal. Sufficient data and examples have been accumulated to show that titanium has excellent corrosion resistance in hundreds of devices and thousands of equipment in petroleum refining and petrochemical engineering, chemical industry engineering, energy engineering, seawater desalination and marine engineering, metallurgical engineering, medicine, salt making, grease, papermaking and other light chemical engineering and other industrial corrosion engineering, so it replaces the traditional stainless steel, copper alloy, nickel alloy, graphite Engineering plastics and other corrosion-resistant materials, and significantly prolong the service life of the equipment.