corrosion wearing epoxy compound chemical resistant coating

BD427 high temperature anti abrasion wearing corrosion chemical resistant repair compound epoxy coatings used in power plant desulfurization system absorption tower and slurry circulating pump rubber lining pipeline repairing and protecting

http://www.wearcoating.com/case-of-desulfuration-pipeline-repairing-coatings/corrosion_wearing_epoxy_compound_chemical_resistant_coating_4512.html

With the development of national economy and the improvement of national environmental protection consciousness,people has higher
requirements for the quality of the atmosphere.Thermal power plant acts as one of the main  SO2 emission sources,faced the pressure
of environmental protection is becoming larger and larger,the implementation of power plant flue gas desulfurization is imperative.
The mainly flue gas desulfurization technology has dry process desulphurization, half dry method desulphurization and wet desulphurization
in the world at present.And wet desulphurization based on its high desulfurization efficiency,reliable & stable operation and without secondary
pollution has been widely applied.In developed countries,more than 90% of the flue gas desulfurization uses the wet desulphurization
technology,most of the flue gas desulfurization based on Chinese coal-fired power plant uses the wet desulphurization technology.

In wet desulphurization system,the abrasion and corrosion of the chimney has a great influence on the desulfurization system and the
reliability and security of the unit.Currently widely used wear resistant anti corrosive construction scheme based on the material itself quality,
construction quality and other reasons caused the crack,bulge,erosive wear,fall off and acid liquor leakage etc. problems.

1.In the whole wet desulphurization system,the flue gas and slurry both have certain corrosivity,so the lining material should have excellent
corrosion resistant performance.

2.in the desulfurization system,when the equipment stops operating,the highest temperature can reach to 120 -150 degree,so the equipment
rubber lining material should have excellent temperature resistance and water resistance.

3.Due to the impurities particle etc. in the slurry circulation systems,the medium flows in a high speed,scour the equipment,
cause the abrasion and cavitation etc.to the equipment, so we usually make a layer of wear resistant coating on the inner wall of the pipeline.

4.Due to the medium of high speed flowing, cause the great shearing force and pressure to the materials,so the material should have a very high
ontology strength,and have good bonding strength to the substrates.

Composite these conditions together,few product can satisfy at the same time at present.Xiangyang Hundred Shield Coating Material Co.,Ltd
is based on the customers’ feedback information,trial and error,summed up a set of effective construction technology.

First:Surface treatment:
First clean up the rusting,dirt and other impurities on the surface of the substrate,and do the sand blasting,grinding and other coarsening
processing.Make the construction part be clean,dry and without pollution,in order to achieve the ideal bonding effect.

Second:The preparation of the undercoat of high temperature resistant corrosion resistant coatings
According to the mass ratio 4:1,make the BD427 high temperature anti wearing corrosion chemical resistant epoxy coatings mix uniformly,
smear it on the pending-repair part,according to the criss cross method,smear for two times,the most suitable coating thickness is 0.3mm.
And then paste a layer of glass fiber cloth on the surface of the coatings.Smear two layers of the BD427 high temperature corrosion resistant
coatings on the surface of the glass fiber cloth according to the criss cross method.And then paste a layer of the glass fiber cloth on the
surface of the BD427 coatings.Smear 2 layers of the BD427 high temperature anti corrosion coatings on the surface of the glass fiber cloth
again.(The thickness of three layers coatings and two layers the glass fiber cloth is about 2 mm)

1.Every time the most quantity of configuring adhesives is not more than 2Kg,and use it up within 30 min,in order to avoid the adhesives
curing to cause the waste.

2.Should mix it uniformly during mixing,the coatings should be compacted during smearing,avoid appearing bubbles,cause the adhesives to
appear the holes after curing.

3.When the temperature is low,the viscosity of the BD427 high temperature anti corrosion abrasion chemical resistant coatings is high,
can heat the A component in water bath separately first to reduce the viscosity.

4.The BD427 high temperature anti corrosion chemical resistant coatings both have the excellent bonding strength and good high-temperature
& corrosion resistance.The glass fiber cloth can enhance the cracking resistant performance of the coatings,for some parts of the ligher abrasion
corrosion and lower temperature resistant requirements,we also don’t have to paste the glass fiber cloth.

Third: The preparation of high temperature resistant flakes corrosion resistant coatings:
After the second layer of the BD427 high temperature anti chemical corrosion resistant coating initial curing,(must before the BD427 coatings
complete curing),according to the mass ratio 4:1,make the BD428 high temperature flakes corrosion resistant coating mix uniformly,
smear it on the surface of the BD427 coatings,the coating should be compacted along one direction to avoid appearing holes.
(the thickness of the coatings is about 3mm)

1.Every time the most quantity of configuring adhesives is not more than 2Kg,and use it up within 30 min,in order to avoid the adhesives
curing to cause the waste.

2.Should mix it uniformly during mixing,the coatings should be compacted during smearing.

3.When the temperature is low,the viscosity of the BD428 coatings is high,can heat the A component in water bath separately
first to reduce the viscosity.

4.The BD428 high temperature flakes corrosion resistant coating has very excellent high temperature resistance and corrosion resistance,
for the parts of the lower corrosion resistance requirements,you don’t have to use the BD428 high temperature scales corrosion resistant
coatings,for the parts of the very serious corrosivity,such as flue,the absorption tower etc.parts,this step is indispensable.

Fourth: the preparation of high temperature resistant anti abrasion coating
After the BD428 high temperature flakes anti corrosive coatings initial curing,blade coating a layer of BD727 high temperature small particle
wearing abrasion resistant coatings on its surface.(the thickness is about 3mm)

The BD727 high temperature small particles anti abrasive coating has good corrosion resistance and excellent high temperature resistance,
wear abrasion resistance.In the slurry circulating system,the abrasion and cavitation is more serious,so this step is necessary in the slurry
circulating system,in the flue,absorption tower and other abrasion lighter parts,this step is optional.

Fifth: brush coating the topcoat
Can brush coating a layer of BD427 high temperature corrosion resistant coating epoxy compound on the surface of the BD727 high
temperature small particle abrasion resistant coatings as the topcoat.

The topcoat is beautiful and smooth,can reduce the friction force between the slurry and material,increase the service life.

Sixth: Curing
After the BD427 high temperature anti wear corrosion chemical resistant coating complete curing (for 24 hours at room temperature),
then it can be put into using.

Notice:
When the temperature is below 15 degrees,the coating curing speed is slow,the curing is not complete.We can use the iodine tungsten lamp
or hair dryer etc.measures to heat it up to the temperature of 60-80 degree and keep this temperature for 2 hours after the coatings initial curing.

Construction case of BD427 slurry recycle pump repair epoxy compound wearing corrosion chemical resistant coating:



Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s