Corrosion Challenges and Core Anti-Corrosion Technologies of Deep-Sea Hydraulic Rotary Actuators
Release time:
2026-03-17 13:23
Source:
As a key hydraulic executive component of deep-sea operation equipment, the working state of the hydraulic rotary actuator directly determines the operation safety and efficiency of the equipment. The strong corrosiveness and special working conditions of the deep-sea environment put forward strict requirements on the anti-corrosion performance of hydraulic rotary actuators. This article will focus on the deep-sea corrosion challenges and core anti-corrosion technologies to lay a solid foundation for the stable operation of the actuators.
I. Particularity of Deep-Sea Working Conditions: Corrosion Tests Faced by Hydraulic Rotary Actuators
The deep-sea area has the environmental characteristics of high salinity, high humidity, low temperature and variable pressure. Among them, the corrosive ions contained in seawater will continuously erode the metal components of the hydraulic rotary actuator, which is likely to cause hidden dangers such as corrosion damage, pitting corrosion and cracks on the actuator shell, piston rod and sealing components, thereby affecting the sealing effect and action accuracy of the actuator. At the same time, the continuous impact of deep-sea water flow and the periodic swing of the actuator during operation will accelerate the corrosion rate of the parts with local stress concentration, further shortening the service life of the actuator.
II. Core Technical Requirements for Anti-Corrosion of Deep-Sea Hydraulic Rotary Actuators
(I) Selection Requirements of Corrosion-Resistant Materials
In view of the strong corrosive environment of the deep sea, the material selection of the hydraulic rotary actuator shall take corrosion resistance and high strength as the core principles. High-strength metal materials with excellent corrosion resistance shall be preferred, combined with professional surface strengthening treatment processes, to improve the corrosion resistance of the material itself from the source. For key components such as piston rods that are directly in contact with seawater, an exclusive surface treatment process shall be used to form a dense protective layer, which can effectively isolate the contact between seawater and the metal surface, slow down the corrosion process, and ensure the long-term stable operation of the components.
(II) Technical Specifications for Surface Anti-Corrosion Treatment
The surface protection treatment of the hydraulic rotary actuator shall strictly follow the standards of uniformity, density and no defects, and resolutely eliminate weak links such as microcracks and pores on the surface to prevent seawater from penetrating into the interior of the actuator through these gaps and corroding the internal components. The commonly used surface treatment processes shall take both corrosion resistance and wear resistance into account, ensuring that the surface protective layer of the actuator can remain intact during long-term deep-sea operation, not easy to fall off or be damaged, and continuously play an effective anti-corrosion role.
(III) Anti-Corrosion Requirements for Sealing Systems
Considering the particularity of deep-sea operation, the hydraulic rotary actuator shall adopt a multi-stage seal combination design. Through the mutual cooperation of various sealing components, a tight protective barrier is constructed to completely block seawater from entering the interior of the actuator, avoiding corrosion and damage of internal hydraulic components. At the same time, the sealing components shall be adapted to the low-temperature and high-pressure working environment of the deep sea, and maintain good elasticity and sealing performance for a long time, so as to prevent seawater intrusion caused by seal failure and corrosion faults.
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