Study On Capacity Of Scale & Corrosion Inhibition Of HA-Na Water Treatment Agent

Traditional phosphorous water-treatment agents are usually employed to control scale and corrosion in treating circular cooling water. Subsequently the second scale(Calcium phosphate)is easily brought and distributed asymmetrically. Furthermore, food(phosphorus)is also provided for bacteria and waterweeds in cooling water system ,and sticky scale is formed due to massive multiplied bacteria and waterweeds which have to be annihilated by creature-killed agents Waste cooling water is discharged and not only pollutesenvironment ,but will lead to red tide in water. Presently, the very important and urgent task in treating cooling water is to replace phosphorous water-treatment agents by secure and green and highly-performing ones.Based on study of its capacity of absorbing calcium and magnesium ion and its performance and apllication by researchers all over the world, that humic acid is non-toxic and able to inhibiting scale and corrosion when it is used in cooling water is concluded.So,that its capacity of scaleinhibition,corrosion inhibition and mechanism are studied and that humic acid will be actively tapped is very important.In our laboratory,the subject applies a method of static-state scale inhibition and a method of rotary hung chip to study capacity of scale inhibition ,scale diffluence,and corrosion inhibition of HA and its compositions.Above of all,the characteristics of scale inhibition (three types of scale)of HA and its composition and its impacting factors are studied by imitating factual water.The capacity of diffluence of calcium carbonate and calcium sulphate is studied. Secondly,the factual capacity of scale inhibition of HA-Na agent and phosphorous water-treatment agent(HEDP and PAA)is compared in constrastive test.Influence of pH and types of functional radical on scale inhibition is also studied. Finally,possible mechanism of scale inhibition and corrosion inhibition is discussed through infrared spectrum and scanning eletricial microscope(SEM) aplliance.That hardness,alkalenscence,concentration of agent,temperature,time, pH,and concentration multiple in cooling water is related with capacity of scale inhibition of HA-Na agent tightly is indicated in experiments.In constrative experiment,that HA-Na composition agent with its percentage of scale inhibition 83.6% excels HEDP.PAA or HEDP and PAA compound respectively is concluded.In the experiment of studying pH effect,reasonable working conditions is found to kill bacteria and waterweeds and decrease sticky scale. In the test of functional radical,the conclusion that the capacity of scale inhibition of carboxyl outclass one of phenolic hydroxyl is arrived at.That content of carboxyl of HA-Na is increased to increase its capacity of scale inhibition is predicted.By using scanning electrical microscopeappliance .micro-crystals of all types of scale absorb HA-Na and place HA-Na in punctiform position ,which lets panes of original crystal arrayed disorderly and increases inner responding force and leads to continuous collapse of a big growing crystals in growing process of crystals and easily flowing ejecta is formed.A black membrane that is formed on surface of steel by HA-Na separates steel from crystal of scale and cooling water. Corrosion of steel and sediment of crystal of scale on surface of metal are prevented by the membrane.Component propotion of HA-Na water treatment agents is not only studied to attain high capacity of scale inhibition,corrosion inhibition and killing bacteria and waterweeds,and possible mechanism of scale inhibition and corrosion inhibition is also discussed in the experiments and tests. The study on subject is importantly introductory in increasing its capacity andtapping and applying HA reasonably in circular cooling water.