CN104195490A - Hot-dip galvanizing aftertreatment process of steel pipe - Google Patents
Hot-dip galvanizing aftertreatment process of steel pipe Download PDFInfo
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- CN104195490A CN104195490A CN201410257743.7A CN201410257743A CN104195490A CN 104195490 A CN104195490 A CN 104195490A CN 201410257743 A CN201410257743 A CN 201410257743A CN 104195490 A CN104195490 A CN 104195490A
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Abstract
The invention relates to a hot-dip galvanizing aftertreatment process of a steel pipe. The hot-dip galvanizing aftertreatment process of the steel pipe comprises the steps of zinc draining, cooling, inner blowing and passivating treatment for the steel pipe, which are conducted successively after hot-dip galvanizing, wherein the passivating treatment is to spray passivating liquid on the inner and outer surfaces of the steel pipe and to bake for 2.5-5 minutes at a temperature of 100-120 DEG C; and the passivating liquid consists of titanate, phosphate, organosilicone modified epoxy resin, triethanolamine, organic acid and water. The aftertreatment process can be adopted to form a composite membrane of phosphate, titanium salt and organosilicone modified epoxy resin on the surface of a hot-dip galvanized layer; and the composite membrane has excellent corrosion resistance.
Description
Technical field
The present invention relates to the technical field of galvanizing, more particularly, the present invention relates to a kind of steel pipe hot-dip galvanizing aftertreatment technology.
Background technology
The corrosion of ferrous materials is not occurring all the time.According to statistics, approximately there are every year 10% steel cannot reclaim because of corrosion.For preventing corrosion, reduce because ferrous materials corrodes the massive losses causing, just must take various anti-corrosion methods, to steel surface, it is exactly a kind for the treatment of process generally adopting that for example steel tube surface is carried out the zinc-plated processing in hot Tianjin.Hot-dip galvanized steel pipe has stronger erosion resistance and intensity, can be widely used in the transport pipe of coal gas, warm G&W.
Because the solidity to corrosion of galvanized steel pipe is in some special industries, for example water or gas line can't reach design service requirements, and galvanized steel pipe can be in transport and storage process the time long, easily there is microbattery formation zinc hydroxide in the surface of galvanized pipe, thereby there will be white rust spot.Therefore,, in order further to improve the antiseptic property of galvanized steel pipe, conventionally need to carry out surface passivating treatment to galvanized steel pipe.Traditional Passivation Treatment is mainly taking chromic salt as main sexavalent chrome passivation.It is good that chromating has passive film solidity to corrosion, and technology maturation is with low cost, uses simple to operately, and outward appearance is beautiful and have the advantages such as self-reparing capability, and becomes the conventional deactivating process for the treatment of of zinc coating.But because sexavalent chrome toxicity is high and have carinogenicity, the discharge of chromyl passivation waste liquid will be subject to more and more stricter control.Therefore, in recent years, more and more popular to the development and production of chromium-free passivation liquid in the world, in existing chromium-free passivation liquid, mainly contain zirconium liquid, titanium salt passivating solution, the false transformant passivating solution of phosphoric acid salt etc., but they are difficult to reach completely application request aspect corrosion resistance nature.
In prior art, use the hot-dip galvanized steel pipe of zirconates, titanium salt or phosphoric acid salt passivation easily to form in actual use surface " rotten zinc " phenomenon, " white powder " phenomenon of namely conventionally saying; Once occur that this situation will reduce the antiseptic property of zinc coating greatly, the major cause that occurs above situation is the acid such as airborne water and carbonic acid gas, in alkaline environment, can form electrolytic solution on zinc pipe surface, make zinc generation " microbattery " reaction on zinc pipe surface form Zn (OH)
2, accelerate zinc corrosion, seriously shorten the work-ing life of zinc pipe.And adopting passivating solution of the present invention, it can form fine and close composite membrane, can significantly improve the solidity to corrosion of passivation layer.
Summary of the invention
In order to solve above-mentioned technical problem of the prior art, the object of the present invention is to provide a kind of steel pipe hot-dip galvanizing aftertreatment technology.
In order to solve the described technical problem of invention and to realize goal of the invention, the present invention has adopted following technical scheme:
Steel pipe hot-dip galvanizing aftertreatment technology of the present invention, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; It is characterized in that: described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120～200 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.5～0.8MPa, and the temperature of steam is 120～150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to utilizes the passivating solution processing that contains inorganic inhibitor and organic membrane-forming agent.
Wherein, described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5～5min under the condition of 100～120 DEG C.
Wherein, described passivating solution contains titanate, phosphoric acid salt, modifying epoxy resin by organosilicon, trolamine, organic acid and water.
Wherein, described passivating solution is made up of titanate, phosphoric acid salt, modifying epoxy resin by organosilicon, trolamine, organic acid and water.
Wherein, described modifying epoxy resin by organosilicon is prepared by following methods: epoxy resin E44 and butyl (tetra) titanate catalyzer are put into the there-necked flask that agitator, reflux condensing tube and dropping funnel are housed, after being heated to 80～120 DEG C, start to stir, the mass ratio of wherein said epoxy resin E44 and butyl (tetra) titanate catalyzer is 10: 0.1～0.2; Then in Z6018: the ratio that E44 mass ratio is 1: 2 slowly drips the organosilyl xylene solution of Z6018, and 200 DEG C of reactions 4.5～5.5 hours, then reflux condensation mode constantly separates the micromolecular compound alcohol and water that evolution reaction produces, and obtains translucent sticky shape modifying epoxy resin by organosilicon.
Compared with immediate prior art, steel pipe hot-dip galvanizing aftertreatment technology of the present invention has following beneficial effect:
Embodiment
Below with reference to specific embodiment, steel pipe hot-dip galvanizing aftertreatment technology of the present invention is further elaborated, to help those skilled in the art to have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme; What need statement is that description in specific embodiment is all exemplary, and does not mean limiting the scope of the invention, and interest field of the present invention is as the criterion with the claim limiting.
Steel pipe hot-dip galvanizing aftertreatment technology of the present invention, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120～200 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.5～0.8MPa, and the temperature of steam is 120～150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5～5min under the condition of 100～120 DEG C.Described passivating solution is made up of the phosphoric acid salt of 1.8～2.5wt% titanate, 3.2～5.8wt%, the modifying epoxy resin by organosilicon of 12.0～15.0wt%, the trolamine of 0.3～0.5wt%, organic acid and the water of 2.3～2.8wt%.And described organic acid is selected from the organic acid that contains hydroxyl in the present invention, it can be one or more in citric acid, tartrate, oxysuccinic acid, Whitfield's ointment or lactic acid specifically.Described phosphoric acid salt can be selected from one or more in sodium phosphate, sodium hydrogen phosphate, SODIUM PHOSPHATE, MONOBASIC or zinc phosphate.Prepared by following methods at the modifying epoxy resin by organosilicon described in middle embodiment of the present invention: epoxy resin E44 and butyl (tetra) titanate catalyzer are put into the there-necked flask that agitator, reflux condensing tube and dropping funnel are housed, after being heated to 80～120 DEG C, start to stir, the mass ratio of wherein said epoxy resin E44 and butyl (tetra) titanate catalyzer is 10: 0.12; Then in Z6018: the ratio that E44 mass ratio is 1: 2 slowly drips the organosilyl xylene solution of Z6018, and 200 DEG C of reactions 4.5～5.0 hours, then reflux condensation mode constantly separates the micromolecular compound alcohol and water that evolution reaction produces, and obtains translucent sticky shape modifying epoxy resin by organosilicon.Described galvanizing in the present invention, it can be pure zinc that described zinc is bathed, or zinc alloy, for example aluminium zinc.As exemplarily, be that in the Ni of Si, 1.32wt% of Ti, 0.75wt% of the Al, the 0.25wt% that are containing 5.8wt% and the zinc alloy baths of the zinc of surplus, plating obtains at the galvanizing described in embodiments of the invention and comparative example.And adopt passivating solution of the present invention, and it can form fine and close composite membrane, and it can significantly improve the solidity to corrosion of galvanizing passivation layer.
Embodiment 1
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium phosphate of 1.8wt% sodium titanate, 3.2wt%, the modifying epoxy resin by organosilicon of 15.0wt%, the trolamine of 0.5wt%, citric acid and the water of 2.5wt%.
Embodiment 2
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the SODIUM PHOSPHATE, MONOBASIC of 1.8wt% sodium titanate, 3.2wt%, the modifying epoxy resin by organosilicon of 15.0wt%, the trolamine of 0.5wt%, oxysuccinic acid and the water of 2.5wt%.
Embodiment 3
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium hydrogen phosphate of 1.8wt% sodium titanate, 3.2wt%, the modifying epoxy resin by organosilicon of 15.0wt%, the trolamine of 0.5wt%, tartrate and the water of 2.5wt%.
Embodiment 4
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium phosphate of 2.5wt% sodium titanate, 5.8wt%, the modifying epoxy resin by organosilicon of 12.0wt%, the trolamine of 0.5wt%, tartrate and the water of 2.5wt%.
Embodiment 5
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, the modifying epoxy resin by organosilicon of 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Embodiment 6
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 5min under the condition of 100 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, the modifying epoxy resin by organosilicon of 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Embodiment 7
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 5min under the condition of 100 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, the modifying epoxy resin by organosilicon of 13.5wt%, the trolamine of 0.5wt%, Whitfield's ointment and the water of 2.5wt%.
Embodiment 8
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 5min under the condition of 100 DEG C.Described passivating solution is made up of the sodium phosphate of 2.1wt% sodium titanate, 5.0wt%, the modifying epoxy resin by organosilicon of 13.8wt%, the trolamine of 0.4wt%, Whitfield's ointment and the water of 2.5wt%.
Embodiment 9
Steel pipe hot-dip galvanizing aftertreatment technology described in the present embodiment, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 5min under the condition of 100 DEG C.Described passivating solution is made up of the sodium phosphate of 2.3wt% sodium titanate, 5.1wt%, the modifying epoxy resin by organosilicon of 13.2wt%, the trolamine of 0.4wt%, tartrate and the water of 2.5wt%.
Comparative example 1
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 5min under the condition of 100 DEG C.Described passivating solution is made up of the sodium phosphate of 3.8wt%, the modifying epoxy resin by organosilicon of 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 2
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the modifying epoxy resin by organosilicon of 2.0wt% sodium titanate, 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 3
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 5min under the condition of 100 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% Sodium orthomolybdate, 3.8wt%, the modifying epoxy resin by organosilicon of 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 4
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% sodium zirconate, 3.8wt%, the modifying epoxy resin by organosilicon of 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 5
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 5min under the condition of 100 DEG C.Described passivating solution is made up of the trolamine of epoxy resin E44, the 0.5wt% of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, 13.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 6
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the trolamine of organosilicon Z6018, the 0.5wt% of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, 13.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 7
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 8
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, the 2-Hydroxy ethyl acrylate of 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Comparative example 9
Steel pipe hot-dip galvanizing aftertreatment technology described in this comparative example, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; Described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 150 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.6MPa, and the temperature of steam is 150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5min under the condition of 120 DEG C.Described passivating solution is made up of the sodium phosphate of 2.0wt% sodium titanate, 3.8wt%, the organosilicon crylic acid latex of 13.5wt%, the trolamine of 0.5wt%, lactic acid and the water of 2.5wt%.
Evaluate the resistance to corrosion through the Several Thiourea Derivatives on Zinc Plate Surface of embodiment and comparative example by neutral salt spray corrosion test.Wherein, neutral salt spray corrosion test refers to reference to GB/T10125-1997 and adopts continuous spray test 120h, observes the area that occurs " white rust ", with the shared percentage ratio of cross-hatching calculating " white rust " area, and carries out grade evaluation with reference to GB/T6461-2002.Described neutral salt soak test refers to the sample of processing through the present invention is immersed respectively in the sodium chloride solution of 5wt% 30 days, observes " white rust " area percentage after certain hour.
The Evaluation of Corrosion Resistance standard results of table 1 embodiment and comparative example
For the ordinary skill in the art; specific embodiment is just exemplarily described the present invention; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (8)
1. a steel pipe hot-dip galvanizing aftertreatment technology, steel pipe hot-dip galvanizing aftertreatment technology, it comprise drop zinc that steel pipe is carried out carrying out successively after galvanizing, cooling, in blow and Passivation Treatment step; It is characterized in that: described drop zinc refers to that the hot-dip galvanized steel pipe during zinc is bathed takes out rear-inclined and places, enter in zinc bath with mobile zinc liquid drop inside and outside making steel pipe, then place 3～5 minutes, make to be cooled to 120～200 DEG C to make generating zinc-iron alloy layer at described steel pipe surfaces externally and internally inside and outside described hot dip process zinc pipe; Then utilize steam to blow in carrying out, interior blow pressure power is 0.5～0.8MPa, and the temperature of steam is 120～150 DEG C, and the time is 10～30 seconds, and zinc powder unnecessary in hot dip process zinc pipe is blown in zinc bucket; Described Passivation Treatment refers to utilizes the passivating solution processing that contains inorganic inhibitor and organic membrane-forming agent.
2. steel pipe hot-dip galvanizing aftertreatment technology according to claim 1, is characterized in that: described Passivation Treatment refers to passivating solution is ejected on described steel pipe internal-surface and outside surface, and toast 2.5～5min under the condition of 100～120 DEG C.
3. steel pipe hot-dip galvanizing aftertreatment technology according to claim 1, is characterized in that: described passivating solution contains titanate, phosphoric acid salt, modifying epoxy resin by organosilicon, trolamine, organic acid and water.
4. steel pipe hot-dip galvanizing aftertreatment technology according to claim 1, is characterized in that: described passivating solution is made up of titanate, phosphoric acid salt, modifying epoxy resin by organosilicon, trolamine, organic acid and water.
5. according to the steel pipe hot-dip galvanizing aftertreatment technology described in claim 3 or 4, it is characterized in that: described modifying epoxy resin by organosilicon is prepared by following methods: epoxy resin E44 and butyl (tetra) titanate catalyzer are put into the there-necked flask that agitator, reflux condensing tube and dropping funnel are housed, after being heated to 80～120 DEG C, start to stir, the mass ratio of wherein said epoxy resin E44 and butyl (tetra) titanate catalyzer is 10: 0.1～0.2; Then in Z6018: the ratio that E44 mass ratio is 1: 2 slowly drips the organosilyl xylene solution of Z6018, and 200 DEG C of reactions 4.5～5.5 hours, then reflux condensation mode constantly separates the micromolecular compound alcohol and water that evolution reaction produces, and obtains translucent sticky shape modifying epoxy resin by organosilicon.
6. according to the steel pipe hot-dip galvanizing aftertreatment technology described in claim 3 or 4, it is characterized in that: described phosphoric acid salt can be selected from one or more in sodium phosphate, sodium hydrogen phosphate, SODIUM PHOSPHATE, MONOBASIC or zinc phosphate.
7. according to the steel pipe hot-dip galvanizing aftertreatment technology described in claim 3 or 4, it is characterized in that: described organic acid is selected from the organic acid that contains hydroxyl.
8. steel pipe hot-dip galvanizing aftertreatment technology according to claim 7, is characterized in that: described organic acid is selected from one or more in citric acid, tartrate, oxysuccinic acid, Whitfield's ointment or lactic acid.
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| CN105177485A (en) * | 2015-09-24 | 2015-12-23 | 河北工业大学 | Hot galvanizing post-treatment equipment |
| CN106591757A (en) * | 2017-02-21 | 2017-04-26 | 丹阳市腾黄钢管镀锌有限责任公司 | Steel pipe hot-dip galvanizing automatic production line |
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| CN107513681A (en) * | 2017-08-18 | 2017-12-26 | 桐乡市铁盛线路器材有限公司 | A kind of hot-dip galvanizing technique |
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| CN1044624C (en) * | 1996-05-23 | 1999-08-11 | 深圳宝平投资发展有限公司 | Improved hot galvahized tube inner-blowing technology |
| JP4038001B2 (en) * | 2000-06-06 | 2008-01-23 | 新日本製鐵株式会社 | Galvanized steel sheet with excellent heat resistance, heat discoloration resistance and corrosion resistance |
| CN1389588A (en) * | 2002-05-26 | 2003-01-08 | 张希刚 | Hot galvanized steel pipe and its production process |
| CN1651592A (en) * | 2005-01-28 | 2005-08-10 | 左树清 | Preparation method of external zinc coated pipe |
| TWI493077B (en) * | 2012-04-27 | 2015-07-21 | China Steel Corp | A water-based metal surface treatment agent and a metal surface treatment method using the same |
| CN102776501A (en) * | 2012-07-11 | 2012-11-14 | 东莞市闻誉实业有限公司 | Aluminum and aluminum alloy non-chromium passivation method and non-chromium passivation solution |
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| CN114807812A (en) * | 2022-04-24 | 2022-07-29 | 上海聚丰热镀锌有限公司 | Hot-dip galvanizing process for metal plated part |
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