CN101439912B - Water treatment technology of vehicle body welding process circulating cooling water system - Google Patents
Water treatment technology of vehicle body welding process circulating cooling water system Download PDFInfo
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- CN101439912B CN101439912B CN200810207456XA CN200810207456A CN101439912B CN 101439912 B CN101439912 B CN 101439912B CN 200810207456X A CN200810207456X A CN 200810207456XA CN 200810207456 A CN200810207456 A CN 200810207456A CN 101439912 B CN101439912 B CN 101439912B
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Abstract
The invention discloses water treatment technology for a circulating cooling water system of vehicle body welding technology, which comprises: agent-feeding treatment of circulating cooling water; arrangement and maintenance of a bypass filter; pollution discharge in workshops; and control of the water quality of the circulating cooling water. The method comprehensively solves the problems of corrosion of pipelines, sedimentation and microorganism reproduction, blockage and damage of welding equipment and so on caused by various defects in the prior circulating water treatment, guarantees long-term stable operation of the system, and maintains the heat exchange efficiency of a heat exchanger, so as to prevent unintended shut-down and prolong the service life of the equipment.
Description
Technical field
The present invention relates to a kind of comprehensive treating process scheme of recirculated water, relate in particular to the water technology scheme of automobile making with process water.
Background technology
Automobile body welding is meant the welding system that use fuses together metal parts by electric current.Welding set can accumulate huge heat in welding process, water coolant flows through welding set, to reach cooling purpose.
From the water treatment angle, the weak point of characteristics that the weldprocedure cooling water system has and corresponding existing water treatment scheme is listed as follows:
| Sequence number | Characteristics | The deficiency of existing water treatment scheme |
| 1 | Arc welding gun head water-interchanger interface temperature is high, and the arc welding gun head position reaches more than 1000 ℃ | The inhibiter high thermal resistance is poor, easily loses efficacy |
| 2 | The welding set place water coolant of flowing through is switched on, and requires water coolant to keep low conductivity, with anti-breakdown | Inhibiter conductivity contribution height can not satisfy the demands |
| 3 | The system device pipe material is extremely complicated, comprises carbon steel, brass, red copper, aluminium, zinc, stainless steel etc., easily generally produces galvanic corrosion | Inhibiter conductivity contribution height easily promotes galvanic corrosion, causes leakage, the fracture of pipe-line equipment |
| 4 | Because of containing amphoteric metals such as a large amount of aluminium, zinc, pH need be strict controlled in neutral range | Lack the pH control device, or institute's with medicament contribution basicity itself, pH improved |
| 5 | Copper equipment part is many especially, and is long-pending big with water engaging surface, high to the inhibition requirement of copper | Despise the inhibition of copper and handle, the copper and copper alloy corrosion is fast, has especially accelerated the stress cracking corrosion of expensive immersion copper cable, has increased production cost greatly |
| 6 | Long-term 26～30 ℃ of water temperature is particularly suitable for microbial reproduction | Single sterilant causes the microorganism resistance, and sterilization effect is not good; Used inhibiter contains NO 2 -Or a large amount of phosphoric, more promote microbial reproduction |
| 7 | Pipeline complexity, equipment precision, narrow and small water stream channel is many, easily stops up.So SS is required high | System is not equipped with other filter equipment, even have, is negligent of safeguarding yet, thereby can't gives full play to its filter effect |
| Sequence number | Characteristics | The deficiency of existing water treatment scheme |
| 8 | Every welding set is a tip point of whole cooling water system, very easily forms deposition so that stop up | Lack rational terminal blowdown maintenance plan, it is not smooth because of current to get off for a long time, causes rosin joint, even stops up and burn out welding gun |
Summary of the invention
The technical issues that need to address of the present invention are: disclose the water treatment scheme of a cover vehicle body weldprocedure recirculated cooling water, to overcome the defective that the prior art scheme exists.
In fact there is not person's cognation very closely in the described every content of last table between mutually, for example, reasonably the inhibiter scheme can effectively be controlled all kinds of etching problems, thereby the suspended substance problem that corrosion produces also can be alleviated greatly; For another example, fully safeguard other filter, also can obviously reduce the tip depositional phenomenon; And for example, a large amount of depositions have also promoted breeding that deposits corrosion down and anerobe or the like.Therefore, provide a whole set of effective comprehensive water treatment scheme, guarantee the long-term stability operation of system, keep the heat exchange efficiency of heat exchanger, thereby stop non-programmed halt, prolong the work-ing life of equipment.
The water technology of automobile body welding technological cycle cooling water system of the present invention comprises following content:
1. the recirculated cooling water dosing is handled: based on the total amount of water coolant, add carbon steel corrosion inhibitor 1000-1500mg/L, copper inhibitor 60-100mg/L, sterilant (referring to effective ingredient) 1-3mg/L in recirculated cooling water.
2. the setting of other filter and maintenance: in recirculating cooling water system, be equipped with other filter, the import and export of other filter are connected with the main pipe line of water system recycle pump front and back respectively, other filter flow is system's total flux of 3～5%, the other filter Inlet and outlet water of monitoring pressure difference, when pressure reduction during, change or clean filter core greater than 0.1MPa;
3. workshop blowdown:
Station every 8-16 hour, carries out the arc welding gun head blowdown during for return water pipe pressure reduction≤0.1MPa before production;
Station for return water pipe pressure reduction≤0.2MPa and＞during 0.1MPa, before production, carried out the arc welding gun head blowdown in every 16-24 hour;
Station for return water pipe pressure reduction≤0.3MPa and＞during 0.2MPa, before production, carried out the arc welding gun head blowdown in every 24-48 hour.
4. circulating cooling water quality control: the pH value of Control Circulation water coolant is 7.0～9.0, and optimum range is 8.0～8.2; Specific conductivity＜500 μ S/cm; Total iron Fe≤2.0mg/L can be controlled at below the 1.0mg/L as far as possible; Total copper Cu≤1.0mg/L; Free copper ion (Cu
2+, Cu
+)≤0.2mg/L; Cl
-＜20mg/L; SO
4 2-＜100mg/L; Ca
2+＜100mg/L.
The tungsten that the preferred special-purpose closed of above-mentioned carbon steel corrosion inhibitor is welded cooling water system is composite corrosion inhibitor, and the mass percent of screening formulation and each component is: 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 1-30%; Sodium wolframate 1-10%; Zinc salt 0.1-1%; Surplus is a water.
Above-mentioned zinc salt can be zinc sulfate, zinc chloride, zinc nitrate etc.
Tungsten be its main inhibition mechanism of composite corrosion inhibitor be with carbon steel piping in iron form the complexing passive film of iron protoxide-oxidation high ferro-wolframic acid iron, have high stability, high compactness, carbon steel is played a very good protection; It also has good provide protection to amphoteric metal aluminium and zinc; Being used of it and copper inhibitor can strengthen the corrosion inhibition of copper and copper alloy.This medicament conductivity contribution value is low, and under the normal dosage of 1000-1500mg/L, its conductivity contribution is 120～150uS/cm only.When with after make up water is mixed, its specific conductivity will be much smaller than the requirement of 500uS/cm; Also be applicable to the pH value scope that 7.0-10 is wideer.This product must once add in cooling water system and put in place, and is monitored the concentration of product by the content of indicator in the test water coolant.
The preferred organic azoles complex copper inhibiter of above-mentioned copper inhibitor, screening formulation is methylbenzothiazole 3-10%, mercaptobenzothiazole 2%-8%, alkali 1-4%, surplus is a water.The cycle that adds of copper inhibitor added once for 2-4 week.
Above-mentioned alkali can be selected from sodium hydroxide, potassium hydroxide.
The inhibition mechanism of this compound prescription is to form the triazole copper complex protective membrane of one deck to which floor in the metallic surface with copper.They have little but the characteristics that corrosion mitigating effect is good of consumption.To the general industrial circulating water system, its dosage is as long as 30～50mg/L can effectively prevent copper corrosion.But for the weldprocedure water system, because copper number of devices and alloy species are many, the surface-area that contacts with water is big, therefore generally needs the dosage of 60～100mg/L, if system's copper corrosion is more serious, then can be increased to more than the 150mg/L adding concentration.In addition, azole molecular energy in this medicament and the free copper ion forming complex in the system.Cupric ion in the water may derive from moisturizing, also can come from the corrosion of copper equipment.This character of azole molecule helps to prevent that cupric ion is deposited on other metal such as carbon steel piping or aluminum part surface and produces galvanic corrosion.
Preferred non-oxidizable sterilant of above-mentioned sterilant such as different thiophene series bactericidal agent (as 2-methyl-4-isothiazoline-3-ketone and 5-chloro-2-methyl-4-isothiazoline-3-ketone), organic aldehyde series bactericidal agent (as glutaraldehyde), organic bromine class (as the bromination propionic acid amide) etc.The cycle that adds of sterilant added once for 1-2 week.Preferable, need the kind of the input scheme of sterilant for the periodic replacement sterilant.
The key of microbiological manipulation be daily with the control of its quantity within limits, rather than a large amount of by the time breeding causes forming deposition or forms foundry loam at tube wall and just takes measures in welding set.Because may cause that the heat exchange position is stopped up this moment or foundry loam below corrosion of metal.Studies show that for the weldprocedure water system, should not adopt halogen is oxidizing bactericide, such as clorox.Because this series bactericidal agent easily is degraded to halide-ions such as chlorion in system, easily zinc, aluminium parts are produced spot corrosion, serious meeting causes perforation.Therefore should adopt the non-oxidizable sterilant such as the isothiazolinone of germ-killing efficiency height, effect longer duration.Its sterilization mechanism is to make microorganism cells death by the protein key that disconnects bacterium and alga cells.Compare with other sterilant, it has the following advantages:
(1) it is low to add concentration, the germ-killing efficiency height.Adding concentration is that 0.5mg/L can reach inhibition microbial growth purpose, and 1～3mg/L can reach highly effective sterilization effect.
(2) compatible good with other water conditioner.Can use jointly with tungstate, azole copper inhibitor and other type sterilant, so it especially is fit to the welding water system.
(3) all kinds of metals there is not erosion action substantially.
(4) sterilization penetration power is strong.Can penetrate the biological clay on the equipment of being attached on and the pipe surface, following microorganism is control effectively.
Certainly for to avoid life-time service to cause the resistance of microorganism with a kind of sterilant, need once other kind series bactericidal agent of replacement regularly, such as organic aldehyde, organic bromine etc., for example added 3 different thiophene series bactericidal agents after, add the organic aldehyde series bactericidal agent again one time.
Other filter is set in water system is handled, and is because existence that common quality problem is exactly a suspended substance in the weldprocedure water system.Suspended substance comprises the pollutent that corrosion of metal products such as iron, copper, microorganism flocs unit, the external world bring into etc., and they easily deposit as welding set at the slow place of system flow rate, have reduced cooling performance.Therefore need to be equipped with other filter filtering suspended substance gradually under not shutdown situation.The import and export of other filter are general to be connected with the main pipe line of welding water system recycle pump front and back respectively, can obtain maximum filter pressure like this, and other filter flow is generally system's total flux of 3～5%.Filtering material is generally fabric filter element, aperture≤50 μ m.In use for some time, along with the trapped substance on the fabric filter element is cumulative, its top hole pressure also progressively descends, because its intake pressure is constant, so pressure reduction will progressively increase, and filtration efficiency also will be more and more lower.Therefore should often pay close attention to the manometric reading of Inlet and outlet water in using, general pressure reduction is advisable less than 0.1MPa, otherwise should consider whether change or clean filter core.
Analyze and find, though general weldprocedure water system design requirements is 〉=0.3MPa.But in the workshop away from each station pressure reduction of water supply pump house because crushing is big, thereby differ and reach this requirement surely, if pressure reduction is less than 0.2MPa, then this station place flow velocity is relatively slow, easily form deposition in the welding gun, rifle head water quality is also relatively poor, causes heat exchange efficiency to reduce.While corrosion inhibitor difficulty takes to herein, or is difficult to effect under the turbidity condition with higher.Therefore be necessary to formulate the blowdown plan of rational workshop, at first answer between test car station for return water pipe pressure reduction situation, the weldprocedure water system that especially new catcher is handled.According to investigation result, can formulate workshop blowdown plan:
Station is during for return water pipe pressure reduction≤0.1MPa, every 8-16 hour before production or the gap carry out the arc welding gun head blowdown;
Station for return water pipe pressure reduction≤0.2MPa and＞during 0.1MPa, every 16-24 hour before production or the gap carry out the arc welding gun head blowdown;
Station for return water pipe pressure reduction≤0.3MPa and＞during 0.2MPa, every 24-48 hour before production or the gap carry out the arc welding gun head blowdown.
Owing to be the local deposits at arc welding gun head place, each blowdown flow rate only needs 2～3L.
The water-quality guideline control of recirculating cooling water system has important effect: (1) pH value.The weld cycle water system contains multiple hardwares such as comprising carbon steel, copper, copper alloy, aluminium, and every kind has its optimal pH value so that its corrosion tendency minimum, and inhibiter also has the pH scope of its performance best effect simultaneously.Therefore, according to theory and actual analysis, welding system pH value is controlled at 7.0～9.0 and is advisable.And optimum range is 8.0～8.2, because can make aluminium obtain the most effective protection this moment.The control of pH can via add a spot of acid or alkali, suitable modes such as draining displacement realize; (2) specific conductivity.As foregoing, different intermetallic the interconnecting of welding set will cause electrocorrosion.Except adding copper inhibitor, another key index that influences the galvanic corrosion degree is a specific conductivity.Because specific conductivity is high more, in the galvanic corrosion reaction between the anode and cathode electronics flow soon more, electric current is just high more, corrosion speed is just fast more.Therefore daily system specific conductivity is low more good more, as adopting pure water as moisturizing.But consider that all kinds of medicaments that added also can contribute specific conductivity, therefore general control specific conductivity＜500 μ S/cm.The control of specific conductivity can be by avoiding excessive dispensing, safeguard desalination aquatic products water device, guarantees to produce mode such as quality and realize (3) total iron and copper.The total iron of weldprocedure water system (content that comprises free state ion, chemical combination attitude, all ferro elements of metal particle in the water body) is generally controlled Fe≤2.0mg/L, can be controlled at below the 1.0mg/L as far as possible.Excessive iron easily promotes the growth of iron bacteria, and easily deposits at welding set.Total iron can be by side filter or also can be by draining removes to main pipe line when too high.But total deposition of iron is very easily caused because flow velocity is slow in the arc welding gun head position therefore, and by the main pipe line water vent is difficult to remove, therefore can directly carry out draining at the arc welding gun head position.Because welding system copper number of devices and kind are more, even added copper inhibitor, its copper corrosion also can not thoroughly be stopped, and compares other general industry recirculated water, and its copper index is often higher.General control total copper (content that comprises free state ion, chemical combination attitude, all coppers of metal particle in the water body) Cu≤1.0mg/L, and for preventing that free copper ion and carbon steel and aluminium from producing galvanic corrosion, add the capacity copper inhibitor, control free copper ion (Cu
2+, Cu
+)≤0.2mg/L.The control of total copper can be by other filter, also can be when too high by blowdown, and especially mode such as arc welding gun head place blowdown realizes that (4) other index comprises some corrosive ions such as chlorion, sulfate radical, nitrite anions and calcium ion, controls as follows: Cl
-＜20mg/L (at pure water as moisturizing), SO4
2-＜100mg/L, Ca
2+＜100mg/L.The control of corrosive ion can realize by the modes such as quality of guaranteeing the de-mineralized water moisturizing.
Preferable, need set up daily monitoring project to recirculating cooling water system, comprise following content:
The moisturizing water quality monitoring (WQM): monitoring project comprises pH, specific conductivity.The moisturizing variation water quality is also relatively more frequent, and the especially fluctuation of its specific conductivity and pH can directly have influence on the water quality of system, carries out the moisturizing water quality analysis termly to prediction weldprocedure water system water quality with deal with problems very important.
The recirculated water monitoring: monitoring project comprises pH, specific conductivity, and total iron, calcium is hard, total copper, chlorine root, sulfate radical.Regularly complete water quality analysis is followed the tracks of emphasis parameter such as pH, specific conductivity, total iron, total copper etc.
The lacing film monitoring: monitoring project comprises the erosion rate monitoring of carbon steel, copper, aluminium, zinc.Lacing film can the representative system pipeline truth.Per season, the lacing film (carbon steel, copper, aluminium, zinc) to each system carried out the erosion rate monitoring, and result is examined in the cooperation water quality analysis quantitatively.
Arc welding gun head and immersion cable are changed condition monitoring: the mean life of each arc welding gun head is according to each factory's difference, follows the tracks of the effect that the overview in its work-ing life and arc welding gun head that observation is changed can help to understand processing.The immersion cable also has work-ing life, and 500,000 palpuses of for example every weldering are changed, and improvement or deterioration that the situation of the several emphasis stations of tracking understanding also can be disposition provide true foundation.
The inventive method has comprehensively solved in the existing circulating water treatment, because of the inhibiter high thermal resistance poor, the conductivity contribution height, lack the pH control device, despise the inhibition processing of copper, single sterilant, used inhibiter contain NO
2 -Or a large amount of phosphoric, lack problems such as corrosive pipeline, deposition and microbial reproduction that defectives such as rational terminal blowdown maintenance plan cause and welding set obstruction, damage; guarantee the long-term stability operation of system; the heat exchange efficiency that keeps heat exchanger; thereby stop non-programmed halt, prolong the work-ing life of equipment.
Embodiment
Below enumerate specific examples with further elaboration the present invention, should be understood that embodiment is used to limit protection scope of the present invention.
Embodiment 1
Object: certain automobile factory's automobile body welding technology cooling water system
Parameters: possess the water yield---130m
3, quantity of circulating water---400m
3/ h, water temperature---26～30 ℃, main pipe line material---weldless steel tube, welding set material---copper and copper alloy, zinc, aluminium, other filter---2, other filter amount 20m
3/ h.
Situation before the scheme implementation:
The former water treatment scheme of this system after water treatment in 5 years operation, finds that system's total iron content is high always, and 5mg/L is up to more than the 20mg/L at least, and water is pale brown look, a large amount of flockss is arranged under static; And the total iron of some arc welding gun head reaches more than the 100mg/L, causes water-cooled tube to be stopped up by iron rust and greatly reduces cooling performance, causes rosin joint, and promptly weld has influenced the quality of production in conjunction with insecure or do not weld phenomenon.Though also can not reduce its total iron content by increasing house steward's drainage frequency.
The analysis of causes:
1, house steward's water quality and welding gun settling are carried out trace analysis, copper content is not high in the house steward of the discovery system water, only be about 0.2mg/L, but copper content is high in the settling, illustrate that former water treatment scheme ignored the inhibition of copper, cause serious copper corrosion, the cupric ion that corrodes substantially all is adsorbed to the carbon steel piping inwall and forms galvanic couple reaction between copper iron, the result causes that iron is constantly dissolved to get off, form a vicious cycle, should, such treatment process is dangerous, gets off for a long time and may cause pipe perforation.
2, do not formulate the blowdown plan of workshop arc welding gun head, cause the deposition accumulation of welding set place, cause obstruction.
Though 3, system is equipped with other filter, does not have maintenance plan, its filter core gets off blocked for a long time.
The enforcement of scheme:
1, change former medicament scheme, adding tungsten is composite corrosion inhibitor 1000-1500mg/L, strengthens the carbon steel corrosion mitigating effect.The most important thing is, replenish organic azoles complex copper inhibiter 100-150mg/L of high density, copper equipment is shielded rapidly, and chelating free copper ion, also carbon steel being played a protective role indirectly, the cycle that adds of copper inhibitor added once for 2-4 week.Sterilant is selected different thiophene series bactericidal agent 2-methyl-4-isothiazoline-3-ketone and 5-chloro-2-methyl-4-isothiazoline-3-ketone for use, and dosage is 1-3mg/L.The cycle that adds of sterilant added once for 1-2 week.Whenever after having added 3 different thiophene series bactericidal agents, add the organic aldehyde series bactericidal agent again one time.
Tungsten is the preparation of composite corrosion inhibitor, and according to the form below preparation tungsten is composite corrosion inhibitor, and tests the carbon steel corrosion inhibition rate of each component:
Prescription: (tungsten of preparation 100kg is composite corrosion inhibitor, and each composition unit is kg)
| Numbering | 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid | Sodium wolframate | Zinc sulfate | Water | The carbon steel corrosion inhibition rate |
| 1 | 4.2 | 3.2 | 0.3 | 92.3 | 100％ |
| 2 | 1 | 8 | 0.8 | 90.2 | 75.3％ |
| 3 | 30 | 2 | 0.3 | 67.7 | 99.3％ |
| 4 | 16 | 1 | 1 | 82 | 96.5％ |
| 5 | 26 | 10 | 0.8 | 73.2 | 100％ |
| 6 | 20 | 4 | 0.1 | 75.9 | 99.6％ |
| 7 | 4 | 5 | 1 | 90 | 100％ |
The prescription of above-mentioned 1-7 all can reach selects requirement for use, in this example, selects prescription 1 for use.
Organic azoles complex copper inhibiter is prepared in the preparation of organic azoles complex copper inhibiter, according to the form below, and tests the copper corrosion inhibition rate of each component:
Prescription: (organic azoles complex copper inhibiter of preparation 100kg, each composition unit is kg)
| Numbering | Methylbenzothiazole | Mercaptobenzothiazole | Sodium hydroxide | Water | The copper corrosion inhibition rate |
| 1 | 3 | 7 | 2.5 | 87.5 | 85.6％ |
| 2 | 10 | 3 | 3.3 | 83.7 | 98.2％ |
| 3 | 7 | 2 | 2.3 | 88.7 | 93.8％ |
| 4 | 5 | 8 | 3 | 84 | 94.7％ |
| 5 | 1 | 4 | 1 | 94 | 76.4％ |
| 6 | 9 | 6 | 4 | 81 | 99.5％ |
| 7 | 8 | 5 | 3.2 | 83.8 | 99.5％ |
Because copper erosion rate in common water body is slow excessively, in order to draw the result of above-mentioned comparison test fast, (3.5% sodium chloride solution PH=6.5) detects the copper corrosion inhibition rate to create the corrosion test medium solution artificially.The prescription of above-mentioned 1-7 all can reach selects requirement for use, in this example, selects prescription 7 for use.
2, the workshop station is investigated, the result is: most just reached design requirements 0.3MPa for the return water pipe pressure reduction, but the workshop away from each station pressure reduction of water supply pump house generally less than 0.2MPa, minimum has only 0.06MPa.Especially in that preceding to enclose each station more outstanding, water quality is poor especially.After full workshop arc welding gun head is concentrated blowdown, carry out blowdown by following blowdown plan:
Station is during for return water pipe pressure reduction≤0.1MPa, every 8-16 hour before production or the gap carry out the arc welding gun head blowdown;
Station for return water pipe pressure reduction≤0.2MPa and＞during 0.1MPa, every 16-24 hour before production or the gap carry out the arc welding gun head blowdown;
Station for return water pipe pressure reduction≤0.3MPa and＞during 0.2MPa, every 24-48 hour before production or the gap carry out the arc welding gun head blowdown.
3, other filter flow being set is system's total flux of 3～5%, and filter core is changed or cleaned to the other filter Inlet and outlet water of monitoring pressure difference when pressure reduction during greater than 0.1MPa,, but regulation every year renew cartridge 2 times at least more.
4, daily monitoring project is set up:
The moisturizing water quality monitoring (WQM): monitoring project comprises pH, specific conductivity.
The recirculated water monitoring: monitoring project comprises pH, specific conductivity, and total iron, calcium is hard, total copper, chlorine root, sulfate radical.
The lacing film monitoring: monitoring project comprises the erosion rate monitoring of carbon steel, copper, aluminium, zinc.
Arc welding gun head and immersion cable are changed condition monitoring.
5, control indexes: the pH value of Control Circulation water coolant is 7.0～9.0; Specific conductivity＜total iron Fe≤the 2.0mg/L of 500 μ S/cm can be controlled at below the 1.0mg/L as far as possible; Total copper Cu≤1.0mg/L; Free copper ion (Cu
2+, Cu
+)≤0.2mg/L; Cl
-＜20mg/L; SO
4 2-＜100mg/L; Ca
2+＜100mg/L.The control of pH via add a spot of acid or alkali, suitable modes such as draining displacement realize; When specific conductivity was too high, its control was by avoiding excessive dispensing, safeguard desalination aquatic products water device, guaranteed to produce mode such as quality and realized; Draining removed by the side filter or to main pipe line when total iron content was too high, and the direct draining in arc welding gun head position is removed; During total copper too high levels, by side filter control or by blowdown, especially blowdown mode in arc welding gun head place realizes; When each corrosive ion exceeded standard, control realized by the quality mode of guaranteeing the de-mineralized water moisturizing.
The result of the present invention program's enforcement:
Through the adjustment of 2 wheat harvesting periods, system's total iron content obviously drops to about 1.5mg/L, and fluctuation is little, and workshop welding gun latch up phenomenon disappears substantially.Through the operation more than 2 years, the total iron of system is kept about 0.7mg/L, and especially under urgent then rhythm of production, appearance has effectively been supported normally carrying out of production because the welding set that corrosion causes stops up or damages phenomenon.
Claims (12)
1. the water technology of automobile body welding technological cycle cooling water system comprises following content:
A, recirculated cooling water dosing are handled: based on the total amount of water coolant, add carbon steel corrosion inhibitor 1000-1500mg/L, copper inhibitor 60-100mg/L, sterilant 1-3mg/L in recirculated cooling water;
The setting of b, other filter and maintenance: in recirculating cooling water system, be equipped with other filter, the import and export of other filter are connected with the main pipe line of water system recycle pump front and back respectively, other filter flow is system's total flux of 3～5%, the other filter Inlet and outlet water of monitoring pressure difference, when pressure reduction surpasses 0.1MPa, change or clean filter core;
C, workshop blowdown:
Station every 8-16 hour, carries out the arc welding gun head blowdown during for return water pipe pressure reduction≤0.1MPa before production;
Station for return water pipe pressure reduction≤0.2MPa and＞during 0.1MPa, before production, carried out the arc welding gun head blowdown in every 16-24 hour;
Station for return water pipe pressure reduction≤0.3MPa and＞during 0.2MPa, before production, carried out the arc welding gun head blowdown in every 24-48 hour;
D, circulating cooling water quality control: the pH value of Control Circulation water coolant is 7.0～9.0; Specific conductivity＜500 μ S/cm; Total iron Fe≤2.0mg/L; Total copper Cu≤1.0mg/L; Free copper ion≤0.2mg/L; Cl-＜20mg/L; SO
4 2-＜100mg/L; Ca
2+＜100mg/L.
2. the water technology of automobile body welding technological cycle cooling water system according to claim 1 is characterized in that carbon steel corrosion inhibitor described in a is that tungsten is composite corrosion inhibitor.
3. as the water technology of automobile body welding technological cycle cooling water system as described in the claim 2, it is characterized in that described tungsten is that the prescription of composite corrosion inhibitor and the mass percent of each component are: 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 1-30%; Sodium wolframate 1-10%; Zinc salt 0.1-1%; Surplus is a water.
4. as the water technology of automobile body welding technological cycle cooling water system as described in the claim 3, it is characterized in that described zinc salt is selected from zinc sulfate, zinc chloride or zinc nitrate.
5. the water technology of automobile body welding technological cycle cooling water system according to claim 1 is characterized in that copper inhibitor described in a is organic azoles complex copper inhibiter.
6. as the water technology of automobile body welding technological cycle cooling water system as described in the claim 5, it is characterized in that the prescription of described organic azoles complex copper inhibiter and the mass percent of each component are: methylbenzothiazole 3-10%, mercaptobenzothiazole 2%-8%, alkali 1-4%, surplus is a water.
7. the water technology of automobile body welding technological cycle cooling water system according to claim 1 is characterized in that sterilant described in a is selected from non-oxidizable sterilant, and the cycle that adds of sterilant added once for 1-2 week.
8. as the water technology of automobile body welding technological cycle cooling water system as described in the claim 7, it is characterized in that, described non-oxidizable sterilant is different thiophene series bactericidal agent or organic aldehyde sterilant or organic bromine sterilant, the cycle that adds of sterilant added once for 1-2 week, and the kind of periodic replacement sterilant.
9. as the water technology of automobile body welding technological cycle cooling water system as described in the claim 8, it is characterized in that, described different thiophene series bactericidal agent is selected from 2-methyl-4-isothiazoline-3-ketone or 5-chloro-2-methyl-4-isothiazoline-3-ketone, described organic aldehyde sterilant is a glutaraldehyde, and described organic bromine sterilant is the bromination propionic acid amide.
10. the water technology of automobile body welding technological cycle cooling water system according to claim 1 is characterized in that, the filtering material of other filter is a fabric filter element described in the b, aperture≤50 μ m.
11. the water technology of automobile body welding technological cycle cooling water system is characterized in that according to claim 1, pH described in the d is 8.0～8.2; Total iron Fe≤1.0mg/L.
12. the water technology as automobile body welding technological cycle cooling water system as described in arbitrary claim among the claim 1-11 is characterized in that also comprise the daily monitoring project of setting up recirculating cooling water system, daily monitoring project comprises following content:
The moisturizing water quality monitoring (WQM): monitoring project comprises pH, specific conductivity;
The recirculated water monitoring: monitoring project comprises pH, specific conductivity, total iron, hard, the total copper of calcium, chlorine root, sulfate radical;
The lacing film monitoring: monitoring project comprises the erosion rate monitoring of carbon steel, copper, aluminium, zinc;
Arc welding gun head and immersion cable are changed condition monitoring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810207456XA CN101439912B (en) | 2008-12-19 | 2008-12-19 | Water treatment technology of vehicle body welding process circulating cooling water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810207456XA CN101439912B (en) | 2008-12-19 | 2008-12-19 | Water treatment technology of vehicle body welding process circulating cooling water system |
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| CN103436888B (en) * | 2013-08-23 | 2015-07-01 | 南京理工大学 | High temperature copper corrosion inhibitor containing benzimidazole and preparation method of high temperature copper corrosion inhibitor |
| CN113387403B (en) * | 2021-06-08 | 2022-02-22 | 广东鑫钻节能科技股份有限公司 | Cooling water recycling and purifying system for air compression station |
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| CN1434283A (en) * | 2003-03-06 | 2003-08-06 | 梁磊 | Method for evaluating the affection of water treatment agent to corrosion-resistance of stainless steel |
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| JP特开2003-275761A 2003.09.30 |
| 张凌娜等.水处理系统中铜缓蚀剂的应用研究.江苏化工.2005,33(1),24-28. * |
| 王洪杰.循环冷却水系统腐蚀与结垢的控制.河北建筑工程学院学报.2000,18(4), * |
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