Slow tensile testing device for R6 grade mooring chain under cathodic protection

Abstract

The invention provides a slow tensile testing device for an R6 grade mooring chain under cathodic protection, comprising a barrel-shaped container filled with artificial seawater and a cover plate. The center of the cover plate is provided with a through hole a for placing an upper stretching jig, the left side of the through hole a is provided with a through hole b for mounting an auxiliary anode, and the right side of the through hole a is provided with a through hole c for mounting a reference electrode. One end of a power output device is connected to the auxiliary anode, and the other endis connected to the upper stretching jig. One end of a voltage test device is connected to the reference electrode, and the other end is connected to the upper stretching jig. A stretching sample issandwiched between the upper stretching jig and a lower stretching jig, and a sealing device is disposed between the lower stretching jig and the bottom of the barrel-shaped container. According to the slow tensile testing device for the R6 grade mooring chain under the cathodic protection, the electrochemical parameter measurement and the measurement environment control can be simultaneously realized without affecting experiment, the environment of cathodic protection in seawater is simulated, the slow strain rate tensile test of R6 grade mooring chain is accurately completed to realize the comprehensive investigation of environmental embrittlement resistance thereof.

Description

technical field [0001] The invention relates to the field of mooring chains, in particular to a chronic tensile test device for R6 mooring chains under cathodic protection. Background technique [0002] The mooring chain is a kind of equipment that fixes the marine floating structure in its operating position. It is a key component of offshore mooring positioning and an indispensable safety guarantee equipment for the mooring of mining and processing devices. According to the mechanical properties, it can be divided into R3, R3S, R4, R4S, R5, R5S, R6 and other grades. In recent years, the sensitivity to environmental hydrogen-induced corrosion has attracted more and more attention from the deep-sea offshore oil and gas industry, and customers have higher and higher requirements for the performance and reliability of mooring chains. At present, the mooring chain has been developed to R6 level with high strength and high toughness. At present, there is no definite slow strai...

AI Technical Summary

Problems solved by technology

[0004] Conventional slow tensile tests generally only compare the section shrinkage in artificial seawater and controlled environments, while mooring chains are affected by cathodic protection outside the hull during use, and the corrosion environment is even harsher. Conventional methods are difficult to comprehensively investigate its resistance to environmental embrittlement performance

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