There are many reasons for rusting of
high-pressure boiler
tube, among which the main reasons include oxidation corrosion, sulfate
corrosion, chloride corrosion and sulfide corrosion. So, how to remove rust is
often what we need to think about. This article will provide the following four
methods for reference:
Cleaning
Use solvents and emulsions to remove oil,
grease, dust, lubricants and other similar organic matter, but cannot remove
rust, scale, solder, etc. on the surface of high-pressure boiler tubes. It can
only be used as an auxiliary means of anti-corrosion production.
Special tool anti-rust treatment
Key application of special tools such as
steel brushes can remove dirt, rust, splashes, etc. on the surface of
high-pressure boiler seamless
pipe that are damaged, loose, and swelled. The anti-rust treatment of
manual tools can reach Sa2 level, and the anti-rust treatment of power tools
can reach Sa3 level. If the surface of high-pressure boiler seamless steel pipe
is adhered to solid dirt, the anti-rust treatment effect of the tool is not
ideal, and the steel anchor depth required by FRP anti-corrosion cannot be
achieved.
Pickling
Generally, chemical and electrolytic
methods are used for pickling. Pipe corrosion can only be treated by chemical
pickling, which can remove scale, rust, and old coating. Sometimes it can be
used for sandblasting after rust treatment. Although chemical water treatment
can make the surface clean and smooth to a certain extent, its anchor line is
shallow and easy to pollute.
Sprayer anti-rust treatment
Sprayer anti-rust treatment is a high-power
electrospray blade running at high speed, so that diamond sand, bearing steel
balls, stainless steel wire, minerals and other wear-resistant materials are
sprayed (points) on the surface of seamless steel pipe under the action of
centrifugal force, which can not only completely remove rust, metal oxides and
stains, but also can be damaged and rubbed in high-pressure boiler seamless
steel pipes to achieve the required uniform surface roughness.
In summary, spray anti-rust treatment is an
ideal rust removal method for pipeline corrosion protection. Generally
speaking, spray anti-rust treatment is mainly used for the surface treatment of
high-pressure boiler steel pipes, and shot peening is mainly used for the
surface treatment of pipelines.