Jiangsu Haifa Machinery Manufacturing Co., Ltd.

With the advancement of marine engineering, deep-sea resource development, and extreme-environment equipment technologies, material corrosion in 10,000-meter deep-sea environments has become a critical issue that must be addressed in the development of high-end pumps. Deep-sea regions are not merely "seawater corrosion" in the ordinary sense but rather complex service conditions combining ultra-high hydrostatic pressure, low temperature, high salinity, low dissolved oxygen, and long-term immersion. At depths of 10,000 in particular, the hydrostatic exceeds 110 MPa, meaning that every pressure-bearing component of the equipment is under extreme compressive stress for extended periods. This imposes stringent requirements on the pump casing, impeller, shaft, fasteners, seals, and anti-corrosion coatings of chemical.

For chemical pumps, material corrosion not only causes wall thinning, pitting, crev corrosion, and stress corrosion cracking, but may also affect rotor dynamic balance, seal face stability, and bearing support reliability. Once corrosion-induced failure occurs in the pump casing or key flow-wetted components in a deep-sea environment, the cost of repair and replacement is extremely high, and it may even jeopardize the safe operation of the entire deep-sea system. Therefore, conducting corrosion testing of materials for 10,000-meter deep-sea chemical pumps holds significant engineering value.

The significance of this 10,000-meter deep-sea corrosion test lies in achieving long-period, in-situ, and continuous monitoring. Through long-life composite sealing technology and ultra-low-power power management systems, the test apparatus was able to continuously collect electrochemical corrosion parameters for 537 days in an extreme environment, providing critical data for analyzing the real service behavior of stainless steel, duplex stainless steel, titanium alloys, nickel-based alloys, and anti-corrosion coatings in deep sea. Compared with laboratory simulation tests, in-situ deep-sea data more accurately reflect the corrosion patterns of materials under real pressure, salinity, temperature, and dissolved oxygen conditions.

For the design of deep-sea chemical pumps, the results can directly guide material selection and optimization of protection systems. For example, the pump and impeller can be made of duplex stainless steel, super duplex stainless steel, titanium alloys depending on the medium and seawater environment; the shaft, shaft sleeves, and fasteners require particular attention to pitting resistance and stress corrosion cracking resistance; and for external surface protection, high-pressure-resistant, impermeable coatings can be adopted in combination with deep-sea-specific sacrificial anodes, forming an integrated full-ocean-depth corrosion protection system combining active and passive measures.

Overall, the 10,000-meter deep-sea chemical pump material corrosion test is not merely material validation—it is a foundational engineering effort for the reliability design of deep-sea equipment. It provides data support for future deep-sea sampling, subsea energy development, deep-sea chemical transport, and-term resident equipment, and it advances chemical pumps from land-based operating conditions toward extreme marine environment applications.

Jiangsu Haifa Machinery Manufacturing Co., Ltd. restructured from Jiangsu Ligong Group Co., Ltd.'s Jingjiang Stainless Steel Pump & Valve Factory under the Iron & Steel Research Institute of the Ministry of Metallurgical Industry, originally established in 1958 The company primarily manufactures API 610 chemical process pumps — OH1, OH2, OH3, OH pumps; BB1, BB2,3, BB4,5 double-casing multistage pumps; VS1, VS4, VS5, VS6 barrel-type pumps; HES chemical process pumps; chemical pumps; deep-sea chemical pumps; deep-sea-liquid mixing pumps; petrochemical pumps; sixth-generation ultra-low-carbon stainless steel high-quality leak-free molten urea pumps; urea hydrolyzer feed pumps; high-temperature asphalt pumps; pitot tube pumps; rotary jet pumps; low-flow high-head pumps; multistage regenerative pumps; high-temperature molten salt pumps;-temperature nitric acid pumps vertical sump pumps; magnetic drive pumps; low-temperature liquid hydrogen and methanol pumps; high-pressure liquid hydrogen pumps; cryogenic pumps; high-temperature nitric acid magnetic drive pumps; magnetic drive pumps for solid-containing media; industrial pumps; canned motor pumps; slurry pumps; titanium tetrachloride pumps; heavy-duty self-priming pumps fluoroplastic-lined pumps; sandwich fluoroplastic-lined pumps; leak-free pumps; desulfurization and denitrification pumps; pumps; pumps; geothermal pumps; oil pumps; flow pumps; printing and dyeing pumps; dyeing and finishing pumps; titanium alloy pumps; C-276 alloy, Hastelloy, 316L, and 347 material pumps; forced circulation pumps; fourth-generation nuclear pumps; nuclear island pumps; CCA/IACS marine pumps; filter press专用 pumps; refrigerant pumps; long-shaft vertical sump pumps; CQC first-class energy-efficiency chemical pumps; high-pressure descaler industrial pumps; and Chinese chemical pumps. Website www.jslgpump.com  Tel: 13905263417  E-mail: jslgpump@gmail.com E-mail: jsareva@163.com