A kind of manufacture method of atmospheric corrosion monitoring sensor
Technical field
The present invention relates to a kind of manufacture method of atmospheric corrosion monitoring sensor, belong to the atmospheric corrosion monitoring field of material.
Background technology
Material corrosion is in an atmosphere the important way of material damage, and the atmospheric corrosion of observation and research material is the important topic of investigation of materials and application.Conventional method by Buddhist nun's battery-type sensors detecting material atmospheric corrosion can be cut down.Its ultimate principle is the corrosion by detecting micro-electric current that two kinds of different metal materials produce because the potential of material is different under thin liquid film state and detecting material.
In order to obtain measurable electric current, what can cut down the general manufacture method of Buddhist nun's battery sensor is be arranged under the overlay interlaced for the multi-disc thin plate of bi-material, separate with very thin insulating material in the middle of thin plate, form an assembly, and again the facade (directly in sheet plane) of assembly be polished flat and expose two kinds of metallic matrixes, form the sensitive surface of sensor.When having dewfall, rain, snow etc. to produce thin liquid film in sensitive surface, will because of corrosion generation observable corrosion current between two kinds of metal materials.This method manufacture can cut down Buddhist nun's battery sensor because will obtain as far as possible responsive detectable electric current, needs the spacing of guarantee two kinds of sheet metals as far as possible little, mutually insulated; Want multi-disc metal to be mutually staggered simultaneously, manufacture and acquire a certain degree of difficulty.Because sheet metal interval is very little, the gap of certain depth is had between sheet, insulating gel infiltrates difficulty, the change of the sensor construction that often can cause because of causing thin slice generation self-corrosion between the liquid infiltration sheet metal in sensitive surface during sensor uses and destruction, sensor corrosion current value alters a great deal with the prolongation of service time, often reaches 10%; The serviceable life (with curent change 20% for inefficacy foundation) of sensor only has 1-2, half a year at least.
Summary of the invention
The object of this invention is to provide and a kind of easyly can cut down Buddhist nun's battery sensor manufacture method reliably, ensure convenience in manufacture process and can control, reducing in use procedure and occur sensor self-corrosion breakoff phenomenon.
A kind of manufacture method of atmospheric corrosion monitoring sensor, two kinds of different types of tinsels or line are comprised the steps: closely to be wrapped in side by side on the right cylinder of surface insulation, mutually insulated between two kinds of tinsels or line, two kinds of tinsels or line wire separately and atmospheric environment electrical contact, are drawn formation and can be cut down Buddhist nun's battery sensor by the outside surface of often kind of tinsel or line respectively.
In the tinsel of two kinds of different materials or line, at least one is surface with the tinsel of insullac or line; The tinsel of two kinds of different materials or the diameter of line is identical or substantially identical.The material of tinsel or line can be selected from the metal or alloy such as iron, copper, aluminium.
Two kinds of different types of tinsels or line wound side by side are after surface scribbles on the right cylinder of uncured insulating gel, and tinsel after winding or line outside surface apply insulating gel again, expose to the open air out after adhesive curing by grinding by metal surface.
Described right cylinder is organic glass or plastic cylinder; May also be the metallic conductor of surface through insulation processing, described insulating gel is curable resin or glue, as epoxy resin.
Concrete manufacture process of the present invention: the right cylinder selecting surface insulation, is coated with one deck insulating gel by its surface; The tinsel that selection two kinds of diameters are substantially identical simultaneously or line, wherein at least one is the insulated conductor of surface with insullac; Two kinds of tinsels or line individual layer are closely wound in periphery side by side; Tinsel after winding or line outside surface are coated with one deck insulating gel, are full of in the space between tinsel; After insulating gel solidification, grinding from insulating gel outside surface, exposes two kinds of metallic matrixes, and now two kinds of intermetallics insulate and have certain spacing, two kinds of tinsels or line wire are drawn formation respectively and can cut down Buddhist nun's battery sensor.
The advantage of the inventive method: in manufacture process, material is easy to get, be easy to control two kinds of intermetallic spacing distances by controlling the factors such as magnet wire insulation layer thickness, grinding depth, method is workable; Owing to not needing to be infiltrated by insulating gel in dark metal slit, there is not the damage caused because of corrosion in metal slit in sensor metal, reliability and the permanance of sensor improve greatly.
Below by the drawings and specific embodiments, the present invention will be further described, but and do not mean that limiting the scope of the invention.
Accompanying drawing explanation
Fig. 1 is that two kinds of metal wires are wound around schematic diagram on the cylinder.
Embodiment
As shown in Figure 1, wherein, A is metal wire 1, B be metal wire 2, C is right cylinder.Concrete manufacture process of the present invention is, select the right cylinder C of a surface insulation, its surface is coated with the curable glue of the thin insulation of one deck, the tinsel simultaneously selecting two kinds of diameters substantially identical or line A and B, i.e. metal wire 1 and metal wire 2, wherein at least one is the insulated conductor of surface with insullac.Two kinds of metal wire A and B individual layer are closely wound in side by side above-mentioned right cylinder C surface, as shown in Figure 1.Be coated with one deck glue again at winding body outside surface after forming certain winding area, the space between tinsel A and B is full of.After colloid solidification, grinding from colloid outside surface, exposes two kinds of metallic matrixes, and now two intermetallics insulate and have certain spacing.Two kinds of metal wire A and B wire are drawn respectively just formed and can cut down Buddhist nun's battery sensor.
Embodiment 1
Select diameter to be iron wire and the copper wire of 1mm, wherein copper cash is enamel insulated wire.Skim epoxy resin coated by the organic glass cylinder of diameter 50mm, before resin solidification, iron wire and copper cash wound side by side are enclosed at right cylinder 50, and then fill epoxy resin in wire surface, after epoxy resin cure, the right cylinder outside diameter after winding is worn into 51mm by upper grinding machine, and now two kinds of tinsels all expose to the open air out, insulation is good simultaneously, iron wire and copper wire is drawn respectively just formation one and can cut down Buddhist nun's battery corrosion sensor.
After sensor completes, immerse in 1%NaCl aqueous solution and measure its initial current value I
0.Sensor is exposed under field conditions (factors) to the open air (use) certain hour again, then surface finish, immerse in 1%NaCl aqueous solution and measure its current value I
i, calculate (I
i– I
0)/I
0obtain the situation of change of its current value with exposure time, result is as shown in table 1.Find out from table 1 result, within the test period of 4 years, the current variation value of sensor is no more than 6%, and the linearity is good, and the life-span is greater than 4 years.
Table 1 sensor current value is with situation of change service time
Exposure time (moon) |
3 |
6 |
12 |
18 |
24 |
36 |
48 |
Curent change (%) |
4.0 |
5.0 |
3.1 |
6.0 |
3.5 |
4.0 |
5.1 |
Embodiment 2
Diameter is selected to be aluminium wire and the copper wire of 2mm, wherein copper cash is enamel insulated wire, and the engineering plastics cylinder of diameter 60mm coats skim epoxy resin, before resin solidification, by aluminium wire and copper cash wound side by side 40 circles on the cylinder, and then fill epoxy resin in wire surface.After epoxy resin cure, the cylindrical outer surface diameter after winding is worn into 62mm by upper grinding machine, and now two kinds of tinsels all expose to the open air out, and insulation is good simultaneously, aluminium wire and copper wire is drawn just formation one with wire respectively and can cut down Buddhist nun's battery corrosion sensor.
After sensor is carried out, immerse in 1%NaCl aqueous solution and measure its initial current value I
0.Sensor is exposed under field conditions (factors) to the open air (use) certain hour again, then surface finish, immerse in 1%NaCl aqueous solution and measure its current value I
i, calculate (I
i– I
0)/I
0obtain the situation of change of its current value with exposure time, result is as shown in table 2.Find out from table 2 result, within the test period of 5 years, the current variation value of sensor is no more than 8%, and the linearity is good, and the life-span is greater than 5 years.
Table 2 sensor current value is with situation of change service time
Exposure time (moon) |
6 |
12 |
24 |
36 |
48 |
60 |
Curent change (%) |
5.3 |
3.3 |
3.3 |
8.0 |
5.0 |
7.0 |