In vacuum salt production, high-temperature concentrated brine contains heavy chloride ions. Carbon steel suffers rapid pitting and perforation, while 316L stainless steel is prone to stress corrosion cracking after long-term service. Benefiting from the unique passivation protection of the titanium cladding layer, titanium-steel clad plates have become the core material for evaporators and heat exchangers.
When titanium contacts brine, a dense and stable titanium dioxide passivation film instantly forms on its surface, fully blocking the penetration of chloride ions. Even minor scratches caused by scouring or impact can be self-repaired in oxygen-containing media to continuously isolate corrosive substances, completely avoiding pitting and crevice corrosion. The base layer adopts pressure vessel carbon steel to guarantee structural strength and weldability. Only a thin titanium cladding of 1–3 mm achieves full corrosion resistance, greatly cutting costs compared with solid titanium equipment.
Industry test data proves that carbon steel equipment lasts less than 2 years under identical brine conditions, 316L stainless steel needs major maintenance within 3–5 years, whereas evaporators made of titanium-steel clad plates can operate stably for over 15 years without large-scale replacement. In addition, the smooth titanium surface reduces salt scaling, extending tank cleaning cycles and lowering steam and power consumption, balancing corrosion resistance, mechanical strength and economic efficiency.
Manufactured via explosive bonding, titanium and steel form atomic-level metallurgical bonding without delamination or gaps, preventing galvanic corrosion from medium penetration at the interface. Perfectly suited to the high-temperature, negative-pressure and high-chloride service conditions of vacuum salt production, these clad plates are standard for new evaporation facilities of large and medium-sized domestic salt plants.
