Method for modifying steel surface of ship body by plasma at normal pressure

Abstract

The invention belongs to the technical field of plasma surface processing and relates to a method for modifying the steel surface of a ship body by a plasma beam, which is to directly accomplish the modification of the steel surface of the ship body by one step of dry-process modification. The method comprises: aiming a spray gun for plasma modification at normal pressure at a steel workpiece part of the ship body to be processed, moving the spray gun at a level which is 10 to 20 millimeters above the surface of a workpiece at a constant speed and parallelly relative to the workpiece, spraying the plasma beam onto the surface of the steel workpiece of the ship body in a normal-pressure, normal-temperature and open environment, and performing the normal-temperature plasma modification of the surface of the steel workpiece of the ship body, wherein the plasma is one or more of the air, argon, nitrogen or functional gas which may be the mixed gas of ammonia gas, oxygen, silane gas, siloxane gas and acrylic acid and methylacrylic acid vapor. The process is simple, the flow is short, the controllability is high, the automation is high, the energy consumption is low, the industrial production is easy to realize, and the environment pollution is light.

Description

Technical field: [0001] The invention belongs to the technical field of plasma surface treatment, and relates to a method for modifying and treating the surface of ship hull steel by using atmospheric pressure plasma beams, in particular to a material surface treatment method for bonding organic coatings. Background technique: [0002] The marine environment is a very harsh and corrosive environment. Ships have been in such a marine environment for a long time, and the corrosion is extremely serious. The firm combination of the coating and the steel surface is the prerequisite for the coating to exert its anti-corrosion function. The rust, scale, and oil on the steel surface hinder the coating. Bonds to steel surfaces, therefore the substrate surface must be pre-treated before painting. At present, the surface pretreatment methods of hull steel include solvent cleaning, sand blasting, shot peening and phosphating, etc. These methods have their own advantages in improving the...

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Problems solved by technology

Chinese patent CN1913928A records that a coupling agent is used to form a coordination bond on the surface of titanium, stainless steel and other metals to improve the binding force with the polymer, but the metal material needs to be corroded in hydrofluoric acid, then passivated in nitric acid, and then After cleaning and drying with distilled water, the process is complicated and difficult to apply on a large scale; Chinese patent CN101032802 records the atmospheric pressure plasma polishing method, which can realize ultra-smooth processing on the surface of hard and brittle difficult-to-machine materials, which improves the processing efficiency by about 10 times and does not require a vacuum chamber. , which reduces the cost of equipment and can expand the scope of application; Chinese patent CN101321614A records a method for treating a composite material structure with atmospheric pressure plasma, and adopting this technology can improve the bonding strength of a composite material structure to another structure; literature (M.C.Kim, Surface treatment of metals using an atmospheric pressure plasma jet and their surface characteristics, Surface and Coatings Technology 174-175 (2003) 839-844) studies have shown that atmospheric pressure plasma treatment of aluminum, copper, stainless steel and other metal surfaces can efficiently remove the surface Oil stains, and the introduction of C-O groups

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