chimney flue repairing and protecting
chimney flue anti wear abrasion corrosion resistant coating material application case
It appears serious abrasion and corrosion problems for one of Guizhou steel plant sintering machine chimney flue and dust removal equipment in
the process of running,as the too high work environment temperature,it is very difficult to apply to this working condition for the general organic
type abrasion resistant coating,but inorganic type wear resistant coating material has bad bonding force to the metal substrates,it is very difficult to
apply to,they mainly use the method of tortoise-shell-net filling in inorganic abrasion resistant coating material,but the construction period is too long
for using tortoise-shell-net,the construction cost of unit area is too high,it will appear large area falling off phenomenon in the process of running,the
effect is not very ideal.
Xiangyang Hundred Shield chooses the high performance interpenetrating network structure high temperature resistant,wear resistant polymeric ceramic
material BD766 high temperature anti wear abrasion resistant coating which compounded by high performance abrasion resistant,corrosion resistant
material(such as ceramic,silicon carbide,carborundum and titanium alloy etc.) and inorganic high temperature adhesive through many years research.
the product information about our BD766:it has the advantage of high bonding strength to metal substrates,coefficient of thermal expansion near to
metal(not easy to fall off) and high temperature resistant(can reach to 600 deg C) etc.The effect of wear resistant and corrosion resistant is very good,
this product achieves good using effect in the chimney flue of sintering machine,moreover the dosage is small(it is about 1.5-2Kg for 1 square meter),
it has very obvious advantage on economical efficiency compare with other materials.
How to use:
1.Surface treatment: Do the coarsening treatment for the pending-repair parts,grinding with angle grinder or sand blasting etc.The surface after coarsening
treatment should be cleaned,the surface after this treatment should be the one coarse,dry and fresh substrates,and there is no greasy dirt and dust.
2.Brush prime coating:Configure the BD427 high temperature anti corrosion resistant coating as the prime coat according to the specified mixing ratio,
we mainly take advantage of the BD427 high bonding strength feature to regard it as the prime coat transition layer,when the BD427 has no curing,make
the BD776 be coating on its surface to make the wear resistant coating be form the high strength bonding to metal substrates.
3.Preparation: Make A and B two components of BD766 mix and stir uniformly according to mixing weight ratio A:B=4:1 before BD427 curing,and use it up
within 40 min,generally it is while construction and preparation,every time the largest preparation quantity can’t be more than 20Kg,too much adhesive is
solidified too fast,it has not been used up until the partial adhesive has solidified and can’t be used.According to the actual temperature,can properly be
preparation a little more in winter,and a little less in summer.
4.Coating:The suitable coating thickness of BD766 is 1-4mm,should make well mixed materials be coating on the pending-repair parts layer by layer,
the first layer should be compacted,make it infiltrates fully with the substrates,the thickness of each layer should be controlled under the 0.5-1mm,
spread coating the next layer after the upper layer drying,the coating application time for front and back 2 times is depend on the construction temperature
and coating thickness.it's more than 10 hours in winter based on 0.5mm coating thickness,but more than 4 hours in summer.The principle which we
should grasp is that coating on the next layer after the upper layer drying.
5.Curing:After the coating is coated in the specified size,generally we need to place it for 2-3 days before putting into use.
