Anticorrosive technology used for marine environment fastener

Abstract

The invention aims to provide an anticorrosive technology used for a marine environment fastener. The anticorrosive technology used for the marine environment fastener comprises the following steps of removing oil of workpiece, removing rust, carrying out phosphorization or electric galvanized surface treatment, spraying, airing, drying, and preserving heat. A composite coating of 'electrolytic zinc + Xylan coating' is adopted and is applied to anticorrosion of the marine environment fastener for the first time. An anticorrosive technology of the composite coating has the advantages that water-based paint Xylan1424 is provided with dry film self-lubrication performance; coefficient of friction is from 0.05 to 0.10; relative to a black fastener, torsion is decreased by more than 70%, pre-assumed torque quotient is correctly achieved, and the fastener is convenient to connect. Due to the dry film self-lubrication performance and good anti-rusty performance, the anticorrosive technology used for the marine environment fastener is capable of enabling a screw nut to be dismantled easily by a spanner and avoiding destructive dismantling of an acetylene gun after the marine environment fastener is used for many years.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of mechanical fasteners, in particular to anticorrosion technology for fasteners in marine environment. Background technique [0002] The offshore platform is a large-scale offshore steel structure platform built for marine resource exploration, drilling, oil extraction and other industrial activities. It has been exposed to salt spray, moisture and seawater for a long time, and has been eroded by the harsh marine environment for a long time, seriously affecting the offshore platform and production operations. Safety. The various fasteners used for offshore platform installation are key parts to maintain the normal operation of offshore platforms. Under the action of rich electrolytes, severe electrochemical corrosion is prone to occur. The corrosion rate is much higher than that on land, and problems such as corrosion failure and seizure often occur , which increases the maintenance co...

AI Technical Summary

Problems solved by technology

[0004] (1) Large thickness affects fit

[0005] In order to achieve anti-corrosion on the surface of the equipment, the thickness of the paint is usually required to be not less than 300μm, which will have a great impact on the dimensions and installation fit of some machined parts

Taking an ordinary transmission shaft with a diameter of 100mm and a tolerance requirement of h7 as an example, the tolerance requirement of the shaft itself is 0-0.035mm. After the shaft surface is painted, the diameter of the shaft will be increased by at least 300μm×2, that is, 0.6mm, which is far beyond Tolerance requirements will bring unsolvable problems to the assembly of equipment

[0006] (2) Low mechanical strength

[0007] Although most of the current coatings use various resin materials as the main film-forming substances, which have high mechanical strength, there is still a significant gap compared with various metal materials, especially in some open transmission equipment. For example, even if the exposed gear pairs, sprockets, worms, etc. are painted on the surface, they will wear out soon after normal operation, and cannot exert the normal anti-corrosion effect

[0008] (3) Not applicable to standard parts

However, the bolts directly coated with this coating have the defect of rapid corrosion after being used on offshore oil drilling rigs

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