Anti-corrosion treatment method for low-alloy steel pipes of ship boiler

Abstract

The invention discloses an anti-corrosion treatment method for low-alloy steel pipes of a ship boiler. Traditional anti-corrosion treatment is carried out in the mode of degreasing, water washing, acid pickling and phosphating / passivating, and has the defects of complex process steps, high anti-corrosion treatment cost and the like. The method comprises the following steps of (1) protection of raw material steel pipes, wherein a drying agent is placed after the steel pipes are produced, and sealing and packaging are carried out by adding a gas-phase anti-rust film; (2) heat treatment protection, wherein heat treatment is carried out on the steel pipes under the protection of argon with certain purity; (3) inter-process protection, wherein after the interiors of the steel pipes are purged, a gas-phase anti-rust agent is placed at two ends, and the steel pipes are covered with pipe plugs; (4) water pressure rust prevention, wherein clean water added with a water pressure rust inhibitor is adopted for steel pipe water pressure; (5) secondary blow-drying after water pressure is carried out, wherein dry compressed air is adopted to carry out front-back two-time blowing after water of the steel pipes is drained off; (6) protection before delivery; (7) external paint rust prevention; and (8) protective packaging, wherein triangular packaging is adopted. The anti-corrosion treatment method is used for the low-alloy steel pipes of the ship boiler.

Description

technical field [0001] The invention relates to the technical field of anticorrosion of alloy steel pipes, in particular to an anticorrosion treatment method for low alloy steel pipes of naval boilers. Background technique [0002] Such parts are generally manufactured with alloy steel pipes of various materials. Since the steam temperature of ship boiler equipment is relatively low and the operating pressure is low, low alloy steel pipes are used, which have stable comprehensive performance and high cost performance, and become a ship boiler. Preferred material for heating surfaces. [0003] However, since hull assembly is generally carried out in areas with high humidity and high salinity, such as seaside or riverside, carbon steel and low alloy steel pipes are prone to rust when in contact with media such as air or water. If effective anti-corrosion treatment measures are not taken, the It will further develop into corrosion and cause potential risks to the safe operatio...

AI Technical Summary

Problems solved by technology

[0003] However, since hull assembly is generally carried out in areas with high humidity and high salinity, such as seaside or riverside, carbon steel and low alloy steel pipes are prone to rust when in contact with media such as air or water. If effective anti-corrosion treatment measures are not taken, the It will further develop into corrosion and cause potential risks to the safe operation of the boiler. Therefore, effective anti-corrosion treatment must be adopted in the manufacturing process of boiler parts to avoid surface problems such as rust, pitting or corrosion. Traditional anti-corrosion treatment generally uses The method of "degreasing + water washing + pickling + phosphating / passivation" has disadvantages such as complicated process steps and high cost of anti-corrosion treatment

At the same time, if the quality control measures are not strict and the surface treatment is not in good condition, the surface of the steel pipe after phosphating / passivation is more prone to local corrosion, which will affect the surface quality of the final product, and the user may reject it. In order to solve this series of problems, improve The surface quality and yield of the final product urgently require a simple and effective anti-corrosion treatment method for low-alloy steel pipes of naval boilers

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