The D.C.casting preparation facilities of sacrificial magnesium alloy anode and method
Technical field
The present invention relates to sacrificial anode preparation field, particularly relate to a kind of D.C.casting preparation facilities and method of sacrificial magnesium alloy anode.
Background technology
The cathode protection method of sacrificial anode is a kind of method preventing metal erosion; using metal stronger for reproducibility as protection pole; be connected with protected metal and form galvanic cell; the metal that reproducibility is stronger consumes as negative pole generation oxidation reaction, and protected metal just can avoid corrosion as positive pole.Because this method sacrifices anode, (negative pole of galvanic cell) protects negative electrode, and be thus called sacrificial anode (negative electrode of galvanic cell) Protection Code, the element be consumed then becomes sacrificial anode.
Widely, such as sacrificial magnesium alloy anode is applicable to the cathodic protection of the facility anticorrosive metal such as all kinds of steel pipes, storage tank, structures in soil environment to the range of application of sacrificial anode.Magnesium mainly first melts by the preparation of the sacrificial magnesium alloy anode of prior art, then adds the alloy of component in formula, and uniform stirring, then pour in mould, be then placed on ventilation and naturally cool, the then demoulding, finally carry out surface treatment.This preparation method is because be by natural cooling, and cooling velocity is comparatively slow, and one is cause sacrificial magnesium alloy anode coarse grains, electric protection poor-performing, service life shortens, if follow-up employing heat-treating methods improves anode performance, then greatly can increase energy consumption, raise the cost; Secondly because anode is long for cool time, be interrupted and produce, make production efficiency lower; Further, the mould of demand is more in producing, the anode of each specification all must be equipped with multiple mould, and have high input, cost is high.
Summary of the invention
A technical problem to be solved by this invention is: the D.C.casting preparation facilities providing a kind of sacrificial magnesium alloy anode, adopt this preparation facilities to prepare sacrificial magnesium alloy anode production efficiency is high, cost is low and produce product chemical property and improving service life.
A kind of technical scheme of the present invention is: a kind of D.C.casting preparation facilities of sacrificial magnesium alloy anode, it comprises crystallizer, the sprue of concrete length is divided into when can be raised to lowering or hoisting gear in crystallizer and polylith for being solidified by magnesium alloy fused mass, described crystallizer comprises inner bag and shell, described inner bag forms one for the preparation of the half-finished vertical through hole of sacrificial magnesium alloy anode, the cavity that Cooling Water flows is provided with between described inner bag and shell, and described shell is provided with the inlet opening that multiple Cooling Water flows into cavity, and between described shell and inner bag, be also provided with the delivery port that Cooling Water flows out, described lowering or hoisting gear top is provided with the piston with described vertical through hole sliding fit, the size in described piston cross-section face and the cross section of described vertical through hole match.
It also comprises one for accommodating lowering or hoisting gear and for the accommodating cavity of the vertical movement of lowering or hoisting gear, and described accommodating cavity and vertical through hole coaxial line.
Described delivery port is be arranged on one of shell and junction, inner bag bottom to enclose gap.
Another technical problem to be solved by this invention is: provide a kind of D.C.casting preparation method adopting the sacrificial magnesium alloy anode of above-mentioned preparation facilities, adopt this preparation method to prepare sacrificial magnesium alloy anode production efficiency is high, cost is low and produce product chemical property and improving service life.
Another kind of technical scheme of the present invention is: a kind of preparation method of sacrificial magnesium alloy anode, and it comprises the following steps:
(1), by magnesium ingot carry out preheating, then put into crucible melting and become melt, alloy is added in melt stir afterwards and makes it to become magnesium alloy fused mass;
(2), sprue is put into crystallizer, sprue is placed in and is raised on the piston of the lowering or hoisting gear of crystalliser feet, then the magnesium alloy fused mass that step (1) is obtained is poured in the vertical through hole of crystallizer, and continue logical water quench in the cavity of crystallizer and flow into the magnesium alloy fused mass in crystallizer vertical through hole, make the magnesium alloy fused mass curing molding in inflow crystallizer vertical through hole, lowering or hoisting gear decline simultaneously drives sprue to decline;
(3), when lowering or hoisting gear often decline certain value time, another sprue is put in crystallizer vertical through hole, then lowering or hoisting gear continues to decline, magnesium alloy fused mass continues to pour in crystallizer simultaneously, magnesium alloy curing molding is made by water quench, continue so repeatedly, until the minimum that lowering or hoisting gear has dropped to setting stops pouring magnesium alloy fused mass into and stopping passes into cooling water, take out magnesium alloy fused mass and the sprue of solidification, the magnesium alloy solidified between every two sprues is a sacrificial magnesium alloy anode.
The sacrificial magnesium alloy anode that step (3) prepares is carried out surface treatment and follow-up assembling.
Adopt above apparatus and method compared with prior art, the present invention has the following advantages: 1, be originally with die casting, rough surface, and has oxide layer, the preparation method of current series invention D.C.casting, and surface is more smooth; 2, original sacrificial anode is by natural cooling, crystalline particle is thick, chemical property is poor, now by the preparation method of D.C.casting of the present invention, mainly by making crystalline particle become thinner after water for industrial use quick refrigeration, magnesium alloy sacrificial anode electrochemical performance obtained is like this stablized, and service efficiency is higher, can reach more than 50%; 3, originally used single die casting, then wasted time and energy through naturally cooling the demoulding again, production efficiency is low, now by after D.C.casting preparation method of the present invention, and can continuous drawing casting by water cooling, production efficiency promotes greatly, and working environment also significantly improves; 4, because the vertical through hole shape of crystallizer inner bag can change, like this when other difform sacrificial magnesium alloy anodes prepared by needs, only can need the inner bag changing crystallizer, can production cost be greatly reducing like this; 5, the sacrificial anode of original casting has a cast gate, also just to can become product by cutting polishing operation, not only waste human cost but also reduce raw-material utilization rate, produce unnecessary waste (cast gate after cutting also will pass through to melt down again), adopt preparation method of the present invention, split the sacrificial anode of two continuous castings by sprue, such sacrificial anode does not have cast gate, namely do not need to carry out cutting polishing, saved cost.
An accommodating cavity is set, lowering or hoisting gear may be allowed so to be better elevated, ensure that traveling comfort, and accommodating cavity and vertical through hole coaxial line, such lowering or hoisting gear can better rise up in the vertical through hole of crystallizer.
Delivery port is arranged to a circle gap, the cooling water flowed out from gap like this can also give the cooling of the magnesium alloy fused mass from vertical through hole after solidification out, makes its solidification effect better.
Accompanying drawing explanation
Fig. 1 is the structural representation of the preparation facilities of sacrificial magnesium alloy anode of the present invention.
Fig. 2 is the structural representation of the sprue in the preparation facilities of sacrificial magnesium alloy anode of the present invention.
As shown in the figure: 1, lowering or hoisting gear; 2, accommodating cavity; 3, sprue; 4, inner bag; 5, shell; 6, through hole; 7, cavity; 8, inlet opening; 9, gap; 10, piston.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described further, but the present invention is not limited only to following detailed description of the invention.
As shown in the figure: a kind of D.C.casting preparation facilities of sacrificial magnesium alloy anode, it comprises crystallizer, the sprue 3 of concrete length is divided into when can be raised to lowering or hoisting gear 1 in crystallizer and polylith for being solidified by magnesium alloy fused mass, described crystallizer comprises inner bag 4 and shell 5, described inner bag 4 forms one for the preparation of the half-finished vertical through hole 6 of sacrificial magnesium alloy anode, the cavity 7 that Cooling Water flows is provided with between described inner bag 4 and shell 5, and described shell 5 is provided with the inlet opening 8 that multiple Cooling Water flows into cavity 7, and between described shell 5 and inner bag 4, be also provided with the delivery port that Cooling Water flows out, described lowering or hoisting gear 1 top is provided with the piston 10 with described vertical through hole 6 sliding fit, the described size of piston 10 cross section and the cross section of described vertical through hole 6 match.Described crystallizer is that this is on a workbench, and described workbench is arranged on a guide rail, like this when lowering or hoisting gear 1 drops to the minimum point of setting, workbench can drive crystallizer to move, and then just can take out easily and have cured shaping sacrificial magnesium alloy anode.And described inner bag 4 is also provided with a holder made with magnesium alloy materials.The shape of cross section of described vertical through hole 6 can be circle, D font etc., as long as the shape of conversion vertical through hole 1 cross section, just can change the shape of the sacrificial magnesium alloy anode prepared.
Because the magnesium (alloy) of melting very easily burns in atmosphere, so be also provided with gas shield device on crystallizer, with the contact of isolated magnesium and air, prevent the burning of magnesium.
Described lowering or hoisting gear 1 can also be provided with a sensor and controller, described crystallizer top can also arrange a pay-off, when lowering or hoisting gear 1 declines certain value, sensor can transmit a signal to control device, and control device controls pay-off again and is placed on vertical through hole 6 by sprue 3.
It also comprises one for accommodating lowering or hoisting gear 1 and for the accommodating cavity 2 of vertical movement of lowering or hoisting gear 1, and described accommodating cavity 2 and vertical through hole 6 coaxial line.Described accommodating cavity 2 is actually the deep-well being arranged on below ground, and the degree of depth is 6 meters, and described lowering or hoisting gear 1 is just arranged in deep-well, and can vertical movement in deep-well.
Described delivery port is be arranged on shell 5 to enclose gap 9 with one of junction, inner bag 4 bottom.And described gap towards bottom vertical through hole 6, the water flowed out like this can contact with the shaping sacrificial magnesium alloy anode that has cured out bottom vertical through hole 6, makes cooling effect better.Described water inlet, delivery port and cooling water cavity are appropriate design, best to reach magnesium anode cooling effect.
A D.C.casting preparation method for sacrificial magnesium alloy anode, it comprises the following steps:
(1), by magnesium ingot carry out preheating, then put into crucible melting and become melt, alloy is added in melt stir afterwards and makes it to become magnesium alloy fused mass; By colleague, those skilled in the art are familiar with this step, but the formula of each enterprise may be all not too identical, so the alloying component added is all not too identical.
(2), sprue is put into crystallizer, sprue is placed in and is raised on the piston of the lowering or hoisting gear of crystalliser feet, then the magnesium alloy fused mass that step (1) is obtained is poured in the vertical through hole of crystallizer, and continue logical water quench in the cavity of crystallizer and flow into the magnesium alloy fused mass in crystallizer vertical through hole, make the magnesium alloy fused mass curing molding in inflow crystallizer vertical through hole, lowering or hoisting gear decline simultaneously drives sprue to decline; Magnesium alloy fused mass is poured into after in vertical through hole by this step, magnesium alloy fused mass meeting rapid solidification, namely magnesium alloy fused mass also not to flow to bottom vertical through hole just certain curing molding, thus bottom vertical through hole out be all sacrificial magnesium alloy anode after curing molding.
(3), when lowering or hoisting gear often decline certain value time, another sprue is put in crystallizer vertical through hole, then lowering or hoisting gear continues to decline, magnesium alloy fused mass continues to pour in crystallizer simultaneously, magnesium alloy curing molding is made by water quench, continue so repeatedly, until the minimum that lowering or hoisting gear has dropped to setting stops pouring magnesium alloy fused mass into and stopping passes into cooling water, take out magnesium alloy fused mass and the sprue of solidification, the magnesium alloy solidified between every two sprues is a sacrificial magnesium alloy anode.It is fixed that described decline certain value mainly comes according to the demand of client, and the length of the sacrificial magnesium alloy anode of needs is that how many then setting is how many, and be generally set as 0.5 meter, namely each sacrificial magnesium alloy anode length is 0.5 meter.
The sacrificial magnesium alloy anode that step (3) prepares is carried out surface treatment.
Advantage of the present invention is topmost 3 points: 1. magnesium alloy anode is cooled fast in cast molding process, makes anode interior grain refinement, evenly, improves the chemical property of anode, has service life to strengthen and improves.2. due to cooling by water speed, so the curing rate of magnesium alloy fused mass is also very fast, can shape semi-successive cultivation, production efficiency is greatly improved.3. specification anode only need be equipped with a crystallizer, can greatly reduce the outfit of mould like this, reduces and drops into, and reduces production cost.