CN106644827B - A method of differentiating magnesia reunion and hydrated state in silicon-steel magnesium oxide masking liquid - Google Patents

A method of differentiating magnesia reunion and hydrated state in silicon-steel magnesium oxide masking liquid Download PDF

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CN106644827B
CN106644827B CN201610849391.3A CN201610849391A CN106644827B CN 106644827 B CN106644827 B CN 106644827B CN 201610849391 A CN201610849391 A CN 201610849391A CN 106644827 B CN106644827 B CN 106644827B
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magnesia
masking liquid
viscosity number
magnesia masking
detected
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CN106644827A (en
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郭小龙
杨皓
高洋
曹阳
骆忠汉
孙亮
赵胜利
陈文聪
骆新根
苏懿
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Wuhan Iron and Steel Co Ltd
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Abstract

A method of differentiating magnesia reunion and hydrated state in silicon-steel magnesium oxide masking liquid: detection magnesia masking liquid initial-viscosity number V0;Detect magnesia masking liquid viscosity number V1；Detect magnesia masking liquid viscosity number V2；Detect magnesia masking liquid viscosity number V3；Detect magnesia masking liquid viscosity number V4；Aggregating state in magnesia masking liquid is differentiated.Energy accurate judgement of the present invention measures the reunion of magnesia and hydrated state in masking liquid, to accordingly adjust raw materials of magnesium oxide or stirring technique, to eliminate or mitigate reunion, for it is final eliminate the pitted skin that will appear in finished product, bottom is partially thin the defects of provide and take the foundations of technical measures.

Description

A method of differentiating magnesia reunion and hydrated state in silicon-steel magnesium oxide masking liquid
Technical field
The present invention relates to a kind of method of discrimination of material situation, particularly belong to aoxidize in a kind of differentiation silicon-steel magnesium oxide masking liquid The method of magnesium reunion situation.
Background technique
It needs to carry out high annealing in orientation silicon steel production process, to complete secondary recrystallization and steel purification.In order to anti- Stop-band steel needs uniformly to coat magnesia masking liquid in the upper and lower surfaces of strip in the adhesion of high annealing stage.Coating Magnesia reacts to form magnesium silicate insulating bottom layer with silicon steel surface oxidation layer in the high annealing stage, while assisting to remove in steel The impurity such as nitrogen, sulphur.
Currently, magnesia masking liquid generally uses Agitation Tank to configure, water is added in magnesia powder according to a certain concentration ratio In be stirred, add certain TiO when necessary2And other additives.It is stirred after a certain period of time, passes through double-roller type coating Machine is coated on strip.Masking liquid temperature is controlled in use process, controls magnesia coating weight, controls magnesia moisture content Deng.
However, due in magnesia powder magnesium oxide particle it is tiny, generally micron order even submicron order, be configured to It after masking liquid, is attracted each other between magnesium oxide particle due to Van der Waals for, will form aggregate.Meanwhile magnesia can produce Raw hydration reaction, so that a certain amount of magnesium hydroxide is formed on magnesium oxide particle surface, so that magnesium oxide particle surface roughness Increase, exacerbates intergranular reunion.When magnesia aggregate is excessive in masking liquid, when Water-borne paint is excessive, it is coated in steel band On magnesia understand some still in aggregating state (size is generally between 10~100 microns).And such magnesia group Gather after being coated on strip, it is not easy to it is thoroughly dry, there is residual moisture inside aggregate.At the high annealing stage, can make The discharge of reunion internal water is unsmooth, and causes microcell steel strip surface peroxidating, to form the golden defect of dotted leakage.Meanwhile working as group Gather intracorporal moisture when expanding under generating high temperature, will lead to steel band microcell and plastic deformation occurs, be genetic in silicon steel finished product, shape At pitted skin or impression defect, product surface quality is seriously affected, influences stacked coefficient.
In order to eliminate surface quality problems brought by magnesia reunion, therefore need to accurately control the group of magnesia in masking liquid Poly- state, to apply the processing that liquid status carries out distinct methods to different magnesia.But so far, there are no a kind of convenience is fast Prompt accurate method, is measured the aggregating state of magnesia in masking liquid.
Currently, one is microscope direct observing method is used, to observe the magnesium oxide particle state in masking liquid, but observation area Domain be all it is microcosmic, be difficult the whole reunion distribution of magnesia in macroscopic view reflection masking liquid, and be difficult in microcosmic picture Aggregating state is clearly defined, and this method is observed by people, and there are sentence between different gaugers to aggregating state Disconnected is also discrepant.In addition, microscope work and sample preparation are complex, technical difficulty is larger.
Another way is to can reflect oxidation to a certain extent using laser particle analyzer measurement magnesium oxide particle distribution The aggregating state of magnesium.It but is single magnesium oxide particle or magnesia group since the granularity of laser particle analyzer measurement cannot be distinguished Aggressiveness.Additionally, due to the limitation of laser particle size measurement method, the magnesium oxide solution concentration being capable of measuring must be very low, i.e., far Lower than the concentration in magnesia masking liquid normal use process, so actual conditions can not be applicable in, under the use CONCENTRATION STATE of reflection Magnesia aggregating state be only capable of as reference.
Summary of the invention
The invention reside in for there is no the group for facilitating accurate method to characterize magnesia in silicon-steel magnesium oxide masking liquid at present Poly- state proposes that one kind accurately reflects painting by masking liquid viscosity measurement according to the deficiency of silicon-steel magnesium oxide physicochemical characteristic The method of magnesium oxide particle aggregating state in liquid, so that the improvement for magnesia coating quality provides foundation, to solve because of oxidation Magnesium reunite and caused by surface of silicon steel mass defect provide valuable help differentiation silicon-steel magnesium oxide masking liquid in magnesia reunion shape The method of condition.
Realize the measure of above-mentioned purpose:
A method of differentiating magnesia reunion and hydrated state in silicon-steel magnesium oxide masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0Be magnesia masking liquid temperature be 5~11 It is carried out at DEG C using viscosimeter；
When magnesia masking liquid to be checked be laboratory prepare, then when preparing will revolving speed be 1000~2000rpm under sufficiently stir It mixes, and stirs 10~30min；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid revolving speed be 1000 5~20min is stirred under~2000rpm, and is no more than magnesia masking liquid temperature change value at ± 1.0 DEG C and is detected magnesia masking liquid Viscosity number V1；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid in revolving speed To stir 5~20min under 4000~5000rpm, and it is no more than magnesia masking liquid temperature change value at ± 1.0 DEG C and detects oxidation Magnesium masking liquid viscosity number V2；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid in revolving speed To stir 5~20min under 8000~10000rpm, and it is no more than magnesia masking liquid temperature change value at ± 1.0 DEG C and detects oxygen Change magnesium masking liquid viscosity number V3；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid in revolving speed To stir 5~20min under 300~500rpm, and it is no more than magnesia masking liquid temperature change value at ± 1.0 DEG C and detects magnesia Masking liquid viscosity number V4；
6) aggregating state in magnesia masking liquid is differentiated:
As (V3-V4)/V4 ≤ 20%, show that the particle agglomeration of magnesia is less；As (V2-V1)/V1 When >=10%, show oxygen The little particle aquation rate for changing magnesium is higher；As (V3-V2)/V2 When >=10%, show that the bulky grain aquation rate of magnesia is higher；As (V2- V1)/V1 >=10% (V simultaneously3-V2)/V2 When >=10%, show that the aquation rate of magnesia is very high, but it is less to reunite, surface of steel plate is not It will appear pitted skin phenomenon, but will appear peroxidating phenomenon；As (V2-V1)/V1 (the V simultaneously of < 10%3-V2)/V2 When < 10%, show The aquation rate of magnesia is lower, while it is few to reunite, and surface of steel plate is not in pitted skin phenomenon, but will appear the partially thin phenomenon of bottom.
As (V3-V4)/V4 > 20% shows that the particle agglomeration of magnesia is more；As (V2-V1)/V1 When >=10%, show oxygen The bulky grain reunion for changing magnesium is more；As (V3-V2)/V2 When >=10%, it is more to show that the little particle of magnesia is reunited；As (V2-V1)/ V1 >=10% (V simultaneously3-V2)/V2 When >=10%, show that the aquation rate of magnesia is very low, reunites very much, surface of steel plate will appear sternly Weight pitted skin phenomenon, while will appear the partially thin phenomenon of bottom.
Since silicon steel magnesium oxide particle is tiny, particle size is generally at several microns to tens nanometer ranges.In configuration oxygen When changing magnesium masking liquid, magnesium oxide particle can attract each other under the action of Van der Waals in masking liquid, form aggregate, reunite Body size is generally in several microns to tens micron ranges.The aggregating state of magnesia is by magnesium oxide particle surface state, oxidation Magnesium aquation rate, particle size, stirring condition etc. are related.Magnesium oxide particle surface is more coarse, aquation rate is higher, particle size more It is small, mixing speed is faster, the particle agglomeration of magnesia is more serious；Conversely, particle agglomeration is slighter.
The reunion of magnesium oxide particle can be broken up in high-speed stirred or ultrasonic disperse in masking liquid, big aggregate dispersion It comes.At this point, collision probability increases between particle since particle is more dispersed, more tiny, the viscosity of masking liquid can also be increase accordingly. So the difference of viscosity number and viscosity number when stirring at low speed when high-speed stirred, can reflect the reunion degree of particle.The difference of the two Value is bigger, illustrates that reunion degree is higher；Otherwise it is lower.
But if magnesia aquation rate is very high, when high-speed stirred, can remove the magnesium hydroxide on magnesium oxide particle surface layer, promote Aquation inside magnesium oxide particle, to dramatically increase magnesia aquation rate.And since the magnesium hydroxide being stripped is easy to form Flocks shape can greatly increase the viscosity of solution.So viscosity dramatically increases after high-speed stirred, and it is aquation reason, and it is non-agglomerated Reason.For this purpose, again with stirring at low speed certain time after high-speed stirred, if viscosity reduce it is obvious, illustrate to reunite between particle and Start, reduction is more, reunites more serious；If viscosity does not have significant change, illustrate it is more stable between particle, without apparent Reunite and occurs.
Since such magnesia is reunited after being coated on strip, it is not easy to it is thoroughly dry, there is moisture residual inside aggregate It stays.In the high annealing stage, reunion internal water be easy to produce discharge it is unsmooth, microcell steel strip surface peroxidating is caused, thus shape At the golden defect of dotted leakage.Meanwhile when intracorporal moisture of reuniting expands at high temperature, it will lead to steel band microcell and plasticity shape occur Become, be genetic in silicon steel finished product, forms pitted skin or impression defect.
According to above-mentioned mechanism, so that it may according to the viscosity change law under different stirring conditions, differentiate magnesia in masking liquid The reunion of particle and hydrated state.
Energy accurate judgement of the present invention measures the reunion of magnesia and hydrated state in masking liquid, so that accordingly adjustment magnesia is former Material or stirring technique, to eliminate or mitigate reunions, for finally elimination finished product in will appear pitted skin, bottom is partially thin the defects of provide Take the foundation of technical measures.
Specific embodiment
The present invention is described in detail below:
Embodiment 1
The present embodiment take be production line prepare A type magnesia masking liquid, masking liquid temperature be 8.0 DEG C；
Differentiate the method for magnesia reunion situation in A type magnesia masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0Be magnesia masking liquid temperature be 8.0 DEG C It is lower using viscosimeter carry out；The initial-viscosity number V detected0For 42.1cp；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid be in revolving speed 20min is stirred under 2000rpm, magnesia masking liquid temperature change value is 0.3 DEG C, i.e., in the case where magnesia masking liquid temperature is 8.3 DEG C, inspection Survey magnesia masking liquid viscosity number V1For 42.8cP；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid in revolving speed To stir 10min under 5000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 8.8 DEG C2For 46.1cP；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid in revolving speed To stir 10min under 10000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 9.5 DEG C3For 47.4cP；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid in revolving speed To stir 10min under 500rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 10.3 DEG C4For 44.0cP；
6) aggregating state in magnesia masking liquid is differentiated:
It is known: V1For 42.8cP, V2For 46.1cP, V3For 47.4cP, V4For 44.0cP, and substitutes into respective formula and sentenced Other:
It is computed: (V3-V4)/V4 =7.7%≤20%, show that the whole of magnesia is reunited less；
(V2-V1)/V1It is less to show that the bulky grain of magnesia is reunited by=7.7% < 10%；
(V3-V2)/V2 It is less to show that the little particle of magnesia is reunited by=2.8% < 10%；
Due to (V3-V4)/V4 ≤ 20%, and (V2-V1)/V1 < 10%, (V3-V2)/V2 < 10%, therefore show the present embodiment oxygen Change the whole of magnesium to reunite seldom, therefore will not be not in pitted skin and impression problem in surface of steel plate, but since aquation rate is low, can go out The existing partially thin phenomenon of bottom.Verified, result tallies with the actual situation.
Embodiment 2
The present embodiment take be production line prepare Type B magnesia masking liquid, masking liquid temperature be 6.0 DEG C；
Differentiate the method for magnesia reunion situation in Type B magnesia masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0Be magnesia masking liquid temperature be 6.0 DEG C It is lower using viscosimeter carry out；The initial-viscosity number V detected0For 72.5cP；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid be in revolving speed 5min is stirred under 2000rpm, magnesia masking liquid temperature change value is 0.5 DEG C, i.e., in the case where magnesia masking liquid temperature is 6.5 DEG C, inspection Survey magnesia masking liquid viscosity number V1For 71.4cP；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid in revolving speed To stir 15min under 4500rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 6.9 DEG C2For 82.1cP；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid in revolving speed To stir 5min under 9000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 7.3 DEG C3For 97.6cP；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid in revolving speed To stir 20min under 300rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 8.3 DEG C4For 76.7cP；
6) aggregating state in magnesia masking liquid is differentiated:
It is known: V1For 71.4cP, V2For 82.1cP, V3For 97.6cP, V4For 76.7cP, and substitutes into respective formula and sentenced Other:
It is computed: (V3-V4)/V4 It is more to show that the entirety of magnesia is reunited by=27.2% > 20%；
(V2-V1)/V1=15% >=10%, it is more to show that the bulky grain of magnesia is reunited；
(V3-V2)/V2 =18.9% >=10%, it is also more to show that the little particle of magnesia is reunited；
Due to (V3-V4)/V4 > 20%, and (V2-V1)/V1 >=10%, (V3-V2)/V2 >=10%, therefore show the present embodiment oxygen Change the whole of magnesium to reunite very much, therefore will appear more serious pitted skin and impression problem in surface of steel plate.It is verified, result symbol Close actual conditions.
Embodiment 3
The present embodiment take be production line prepare c-type magnesia masking liquid, masking liquid temperature be 6.5 DEG C；
Differentiate the method for magnesia reunion situation in c-type magnesia masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0Be magnesia masking liquid temperature be 6.5 DEG C It is lower using viscosimeter carry out；The initial-viscosity number V detected0For 28.7cP；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid be in revolving speed 5min is stirred under 1500rpm, magnesia masking liquid temperature change value is 0.2 DEG C, i.e., in the case where magnesia masking liquid temperature is 6.7 DEG C, inspection Survey magnesia masking liquid viscosity number V1For 28.8cP；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid in revolving speed To stir 20min under 5000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 7.0 DEG C2For 32.6cP；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid in revolving speed To stir 20min under 10000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 7.6 DEG C3For 36.5cP；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid in revolving speed To stir 20min under 300rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 8.1 DEG C4For 36.1cP；
6) aggregating state in magnesia masking liquid is differentiated:
It is known: V1For 28.8cP, V2For 32.6cP, V3For 36.5cP, V4For 36.1cP, and substitutes into respective formula and sentenced Other:
It is computed: (V3-V4)/V4 =1.1%≤20%, show that magnesia is integrally reunited seldom；
(V at this time2-V1)/V1=13.2% >=10%, show that the little particle aquation rate of magnesia is higher；
(V3-V2)/V2 =12% >=10%, show that the bulky grain aquation rate of magnesia is higher；
Due to (V3-V4)/V4 ≤ 20%, and (V2-V1)/V1>=10%, (V3-V2)/V2 >=10%, therefore show the present embodiment oxygen Change the whole of magnesium to reunite seldom, is not in apparent pitted skin and impression problem in surface of steel plate；But the aquation rate of magnesia compared with Height will cause more serious oxidation tint defect.Verified, result tallies with the actual situation.
Embodiment 4
The present embodiment take be production line prepare D type magnesia masking liquid, masking liquid temperature be 6.8 DEG C；
Differentiate the method for magnesia reunion situation in D type magnesia masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0Be magnesia masking liquid temperature be 6.8 DEG C It is lower using viscosimeter carry out；The initial-viscosity number V detected0For 73.0cP；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid be in revolving speed 10min is stirred under 2000rpm, magnesia masking liquid temperature change value is 0.2 DEG C, i.e., in the case where magnesia masking liquid temperature is 7.0 DEG C, inspection Survey magnesia masking liquid viscosity number V1For 73.3cP；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid in revolving speed To stir 5min under 4000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 7.4 DEG C2For 83.9cP；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid in revolving speed To stir 5min under 8000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 7.9 DEG C3For 84.0cP；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid in revolving speed To stir 20min under 400rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 8.7 DEG C4For 82.1cP；
6) aggregating state in magnesia masking liquid is differentiated:
It is known: V1For 73.3cP, V2For 83.9cP, V3For 84.0cP, V4For 82.1cP, and substitutes into respective formula and sentenced Other:
It is computed: (V3-V4)/V4 It is few to show that magnesia is integrally reunited by=2.3% < 20%；
(V2-V1)/V1=14.5% >=10%, show that the little particle aquation rate of magnesia is higher；
(V3-V2)/V2 It is also less to show that the little particle of magnesia is reunited by=0.1% < 10%；
Due to (V3-V4)/V4 < 20%, and (V2-V1)/V1 >=10%, (V3-V2)/V2 < 10%, therefore show the present embodiment oxygen Change the whole of magnesium to reunite seldom, but aquation rate is higher, is not in pitted skin problem in surface of steel plate, will not cause apparent bottom The partially thin problem of layer.Verified, result tallies with the actual situation.
Embodiment 5
The present embodiment take be production line prepare E type magnesia masking liquid, masking liquid temperature be 5.4 DEG C；
Differentiate the method for magnesia reunion situation in E type magnesia masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0Be magnesia masking liquid temperature be 5.5 DEG C It is lower using viscosimeter carry out；The initial-viscosity number V detected0For 70.4cP；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid be in revolving speed 8min is stirred under 1400rpm, magnesia masking liquid temperature change value is 0.2 DEG C, i.e., in the case where magnesia masking liquid temperature is 5.7 DEG C, inspection Survey magnesia masking liquid viscosity number V1For 71.6cP；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid in revolving speed To stir 10min under 4500rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 6.0 DEG C2For 77.5cP；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid in revolving speed To stir 8min under 10000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 6.2 DEG C3For 80.2cP；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid in revolving speed To stir 10min under 500rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 6.6 DEG C4For 73.2cP；
6) aggregating state in magnesia masking liquid is differentiated:
It is known: V1For 71.6cP, V2For 77.5cP, V3For 80.2cP, V4For 73.2cP, and substitutes into respective formula and sentenced Other:
It is computed: (V3-V4)/V4 =2.3% >=20%, it is more to show that the entirety of magnesia is reunited；
(V2-V1)/V1=8.2% >=10%, it is more to show that the bulky grain of magnesia is reunited；
(V3-V2)/V2 It is less to show that the little particle of magnesia is reunited by=3.5% < 10%；
Due to (V3-V4)/V4 >=20%, and (V2-V1)/V1 >=10%, (V3-V2)/V2 < 10%, therefore show the present embodiment oxygen The entirety reunion for changing magnesium is more, and wherein bulky grain is reunited more, will appear bulky grain pitted skin problem in surface of steel plate.It is verified, Its result tallies with the actual situation.
Embodiment 6
The present embodiment takes production A type magnesia, stir with liquid in the case where revolving speed is 1500rpm in laboratory 20min, 5.0 DEG C of magnesia masking liquid temperature differentiate the method for magnesia reunion situation in E type magnesia masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0Be magnesia masking liquid temperature be 5.0 DEG C It is lower using viscosimeter carry out；The initial-viscosity number V detected0For 40.3cP；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid be in revolving speed 20min is stirred under 1500rpm, magnesia masking liquid temperature change value is 0.2 DEG C, i.e., in the case where magnesia masking liquid temperature is 5.2 DEG C, inspection Survey magnesia masking liquid viscosity number V1For 42.3cP；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid in revolving speed To stir 15min under 5000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 6.0 DEG C2For 45.4cP；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid in revolving speed To stir 8min under 10000rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 6.2 DEG C3For 46.0cP；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid in revolving speed To stir 10min under 500rpm, and magnesia masking liquid temperature is made to detect magnesia masking liquid viscosity number V at 6.3 DEG C4It is 44.6 cP；
6) aggregating state in magnesia masking liquid is differentiated:
It is known: V1For 42.3cP, V2For 45.4cP, V3For 46.0cP, V4For 44.6cP, and substitutes into respective formula and sentenced Other:
It is computed: (V3-V4)/V4 =3.1%≤20%, show that the whole of magnesia is reunited less；
(V2-V1)/V1It is less to show that the bulky grain of magnesia is reunited by=7.3% < 10%；
(V3-V2)/V2 It is less to show that the little particle of magnesia is reunited by=1.3% < 10%；
Due to (V3-V4)/V4 ≤ 20%, and (V2-V1)/V1 < 10%, (V3-V2)/V2 < 10%, therefore show the present embodiment oxygen Change the whole of magnesium solution to reunite seldom, and aquation rate is low.Verified, result meets scanning electron microscopic observation and the detection of aquation rate Situation.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.

Claims (1)

1. a kind of differentiate the method for magnesia reunion and hydrated state in silicon-steel magnesium oxide masking liquid, step:
1) magnesia masking liquid initial-viscosity number V is detected0, detect initial-viscosity number V0It is in the case where magnesia masking liquid temperature is 5~11 DEG C It is carried out using viscosimeter；
When magnesia masking liquid to be checked be laboratory prepare, then when preparing will revolving speed be 1000~2000rpm under be sufficiently stirred, and Stir 10~30min；
2) magnesia masking liquid viscosity number V is detected1, initial-viscosity number V will have been measured0Magnesia masking liquid revolving speed be 1000~ 5~20min is stirred under 2000rpm, and it is viscous so that magnesia masking liquid temperature change value is no more than detection magnesia masking liquid at ± 1.0 DEG C Angle value V1；
3) magnesia masking liquid viscosity number V is detected2, magnesia masking liquid viscosity number V will have been measured1Magnesia masking liquid be in revolving speed 5~20min is stirred under 4000~5000rpm, and be no more than magnesia masking liquid temperature change value at ± 1.0 DEG C to detect magnesia Masking liquid viscosity number V2；
4) magnesia masking liquid viscosity number V is detected3, magnesia masking liquid viscosity number V will have been measured2Magnesia masking liquid be in revolving speed 5~20min is stirred under 8000~10000rpm, and is no more than magnesia masking liquid temperature change value at ± 1.0 DEG C and is detected oxidation Magnesium masking liquid viscosity number V3；
5) magnesia masking liquid viscosity number V is detected4, magnesia masking liquid viscosity number V will have been measured3Magnesia masking liquid revolving speed be 300 5~20min is stirred under~500rpm, and is no more than magnesia masking liquid temperature change value at ± 1.0 DEG C and is detected magnesia masking liquid Viscosity number V4；
6) aggregating state in magnesia masking liquid is differentiated:
As (V3-V4)/V4 ≤ 20%, show that the particle agglomeration of magnesia is less；As (V2-V1)/V1 When >=10%, show magnesia Little particle aquation rate it is higher；As (V3-V2)/V2 When >=10%, show that the bulky grain aquation rate of magnesia is higher；As (V2-V1)/ V1 >=10% (V simultaneously3-V2)/V2 When >=10%, show that the aquation rate of magnesia is very high, but it is less to reunite, surface of steel plate will not go out Existing pitted skin phenomenon, but will appear peroxidating phenomenon；As (V2-V1)/V1 (the V simultaneously of < 10%3-V2)/V2 When < 10%, show to aoxidize The aquation rate of magnesium is lower, while it is few to reunite, and surface of steel plate is not in pitted skin phenomenon, but will appear the partially thin phenomenon of bottom；
As (V3-V4)/V4 > 20% shows that the particle agglomeration of magnesia is more；As (V2-V1)/V1 When >=10%, show magnesia Bulky grain reunite it is more；As (V3-V2)/V2 When >=10%, it is more to show that the little particle of magnesia is reunited；As (V2-V1)/V1 ≥ 10% (V simultaneously3-V2)/V2 When >=10%, show that the aquation rate of magnesia is very low, reunites very much, surface of steel plate will appear serious fiber crops Face phenomenon, while will appear the partially thin phenomenon of bottom.
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CN107694890B (en) * 2017-09-01 2020-10-13 北京曙光航空电气有限责任公司 Coating method of magnesium oxide coating film of 1J22 punching sheet
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