CN109898118A - It is a kind of for fixing the fixture of sample in the liquid phase - Google Patents

Abstract

The invention discloses a kind of for fixing the fixture of sample, including bottom plate, copper electrode, copper conductor, gasket, fastening bolt and top plate in the liquid phase；Sample is placed on copper electrode and together by gasket and is sealed between top plate and bottom plate, and specimen surface region to be modified is contacted by the through-hole on top plate with liquid phase, suitable with dissolution contact area needed for clear size of opening and specimen surface；It is fastened between top plate and bottom plate by fastening screw, copper conductor one end is connected with copper electrode, and the other end is connected with positive pole.Sample itself can not needed to modified region to be isolated with electrolyte, and the fixed area and electrolyte contacts that specimen surface is selected, and in energization, it is all in the selected exposed region in surface and carries out deposition film forming.Simple with specimen, sealing effect is good, and application method is easy.

Description

It is a kind of for fixing the fixture of sample in the liquid phase

Technical field

The present invention relates to the technologies of a kind of pair of metal surface modification more particularly to a kind of for fixing sample in the liquid phase Fixture.

Background technique

Valve metal (magnesium, aluminium, titanium) and its alloy are a kind of important structural metallic materials, they often have light specific gravity, Specific strength and specific stiffness are high, damping characteristics are strong, good heat conductivity, shock resistance are good, electromagnetic shielding capability is strong and easy The advantages that recycling, has some other materials incomparable in fields such as aerospace, communications and transportation, printing, buildings Advantage.But the chemical property of valve metal is generally more active, especially magnesium, aluminium and its alloy.It is exposed in atmosphere, nature The oxidation film corrosion resistance of generation is poor, and the effect of being effectively protected is not had to matrix, is limited by very large its application, in turn It needs to carry out effective surface Hardening Treatment.Differential arc oxidization technique is a kind of technical method for effectively improving valve metal etching problem One of.

Currently, valve metal sample is typically chosen in disk or square plate, first in the research to valve metal differential arc oxidation It needs to punch on one side in sample, is used to connecting wire, then need to carry out sanding and polishing to the tow sides of sample again, also, The edge of sample is also required to polish, and this method not only makes grinding and polishing process very cumbersome, moreover, during the experiment, Due to edge effect, so that the energy of power supply output is largely focused at sample edge protrusion and concentrates electric discharge, and then lead to table Face electric discharge is uneven；In addition, in the experiment such as differential arc oxidation, anodic oxidation, due to needing the disc-shaped sample to preparation to carry out Corrosion and abrasion test and analyze, and in current processing, generally require to polish to a face mask layer of disk, until exposing base Body, such method not only greatly waste the time and efforts of experimenter, also cause the mistake being difficult to avoid that experimental result Difference.

Therefore, the process in liquid phase in metal surface deposition film forming this at present is badly in need of further improve and excellent Change.

Summary of the invention

The object of the present invention is to provide a kind of for fixing the fixture of sample in the liquid phase.It in the liquid phase, can be only to examination It is modified that fixed area selected by sample surface carries out surface.

The purpose of the present invention is what is be achieved through the following technical solutions:

The fixture for being used to fix sample in the liquid phase of the invention, including bottom plate, copper electrode, copper conductor, gasket, fastening Bolt and top plate；

Sample is placed on the copper electrode and together by the gasket and is sealed between the top plate and bottom plate, examination Sample surface region to be modified is contacted by the through-hole on the top plate with liquid phase；

It is fastened between the top plate and bottom plate by the fastening screw, described copper conductor one end is connected with copper electrode, separately One end is connected with positive pole.

As seen from the above technical solution provided by the invention, provided in an embodiment of the present invention for fixing in the liquid phase Sample itself can not needed modified region and is isolated with electrolyte by the fixture of sample, and the fixed area that specimen surface is selected Domain and electrolyte contacts, and in energization, it is all in the selected exposed region in surface and carries out deposition film forming.Fixture assembly examination Sample process is simple, and sealing effect is good, and application method is easy, can be fully solved deficiency and disadvantage present in test at present.

Detailed description of the invention

Fig. 1 is provided in an embodiment of the present invention for fixing the clamp structure schematic diagram of sample in the liquid phase；

Fig. 2 is using magnesium alloy sample differential arc oxidation rear surface pattern photo prepared by apparatus of the present invention.

In figure:

1 through-hole: 8 gasket A:35 × 35 25 × 25 × 2mm × 2mm

2 through-holes: 60 × 60 × 2mm, 9 sample

3 through-holes: 25 × 25 × 2mm, 10 copper electrode: 30 × 30 × 3mm

4 inside grooves: 60 × 60 × 5mm, 11 bolt hole (4): diameter 7.5mm

5 bolts hole (4): 12 bottom plate of diameter 7.5mm: 80 × 80 × 15mm

6 top plates: 80 × 80 × 5mm, 13 conducting wire access aperture (1): diameter 7.5mm

7 gasket B:70 × 70 × 2mm

Specific embodiment

The embodiment of the present invention will be described in further detail below.What is be not described in detail in the embodiment of the present invention is interior Appearance belongs to the prior art well known to professional and technical personnel in the field.

The fixture for being used to fix sample in the liquid phase of the invention, preferable specific embodiment is:

Including bottom plate, copper electrode, copper conductor, gasket, fastening bolt and top plate；

Sample is placed on the copper electrode and together by the gasket and is sealed between the top plate and bottom plate, examination Sample surface region to be modified is contacted by the through-hole on the top plate with liquid phase；

It is fastened between the top plate and bottom plate by the fastening screw, described copper conductor one end is connected with copper electrode, separately One end is connected with positive pole.

The fixture and lysate contact portion are made of the PC plastic and silica gel sealing gasket of acid and alkali-resistance.

The four corners of the top plate and bottom plate are respectively equipped with fastening bolt.

The bottom plate center excavation connected in star, the copper electrode are bonded in groove center, the copper conductor by glue It is inserted into square groove by the through-hole of bottom edge, and is connected with the copper electrode.

The roof center digs square through hole, and clear size of opening and specimen surface are required suitable with dissolution contact area.

The gasket is divided to A and B two kinds of models:

Square through hole is dug in A model gasket, square through hole inner edge size is identical as roof center prescription pore size；

Type B gasket digs square through hole at center, and square through hole inner edge size is identical as bottom plate groove size.

Sample itself can not needed modified region and electricity by the fixture for being used to fix sample in the liquid phase of the invention It solves liquid isolation, and the fixed area and electrolyte contacts that specimen surface is selected, and in energization, is all in selected naked in surface Dew region carries out deposition film forming.Fixture assembly specimen is simple, and sealing effect is good, and application method is easy, can solve completely Deficiency and disadvantage present in certainly testing at present.

Utstanding substantial characteristics and significant improvement of the present invention are:

It is easy to operate

Fixture makes according to sample, during sample (with sample contacts place, available high-temperature resistant rubber is separated, sealed) is clipped in Between, two terminal screws are tightened, do not need to punch in specimen surface, do not need aluminium wire suspension etc.！

Region of discharge area is strictly controllable

As electrochemistry fixture, Area of Sample of the naked leakage in solution can be with on-demand customization, in this way, can prevent from trying Sample two sides and periphery electric discharge, have prevented marginal discharge effect！

Accurately calculate current density, energy density

Because region of discharge property is identical, area is fixed, as long as setting input current or energy, corresponding electric current and energy Metric density can be calculated accurately！

Prepare fixed-size single face film

Primarily to preparation abrasion and corrosion sample, do corrosion or abrasion sample at present, are all first in specimen surface Punching, then by the grinding and polishing of sample two sides, and deposition film forming in the liquid phase, then back side film layer is polished off again.And use this hair Bright prepared fixture directly can prepare single face film in specimen surface, it is no longer necessary to punch, and sample only needs rubbing down one Face is greatly saved the time and efforts of experimenter！

Prevent short-circuit generation

Currently, differential arc oxidation, anodic oxidation etc. are tested, sample often has wire to hang in electrolytic cell, as anode. And electrolytic cell is connected with power cathode and as cathode, in this way, solution under stirring, easily causes sample to connect with electrolytic cell Touching, and lead to the generation of short circuit phenomenon.And use apparatus of the present invention, then this problem can be solved perfectly, because sample is wrapped in folder Tool the inside, it is all local with sample contacts, there is high-temperature insulation rubber ring to be isolated, sealing, so, it is existing that short circuit will not occur again As！

It is applied widely

Whole device uses acid resistance, and alkali-resistant material is made, and is suitable for various acidity, alkaline electrolyte it In！

Specific embodiment:

As shown in Figure 1, first then magnesium alloy sample one side (face A) sanding and polishing is placed the magnesium alloy back side (face B) It on copper electrode, chooses and meets the gasket A of dimensions and be placed in specimen surface, then choose the top plate for meeting size and close Packing B, wherein gasket B is placed among top plate and bottom plate, is plugged bolt and is screwed down, at this point, only the face A is selected for sample Region is exposed, other positions are sealed among fixture；Then this fixture is placed among differential arc oxidation electrolytic cell, with power supply Anode is connected, as anode；Electrolyte composition group becomes 50 parts of sodium metasilicate, 6 parts of potassium hydroxide, neopelex 1 Part and 5 parts of calgon；The micro-arc oxidation treatment time is 20min, and output voltage 460V, power supply duty ratio is 30%；It is micro- After arc oxidation processes, magnesium alloy workpiece is taken out, is cleaned and is dried up with deionized water, surface topography is as shown in Figure 2.

As seen in Figure 2, micro-arc discharge occurs for the exposed region that specimen surface is only selected, and grows in surface in situ Micro-arc oxidation ceramic layer, and the sample rest part being sealed in fixture does not react, this shows that present clip is complete Needed for reaching requirement of experiment entirely, the beneficial effect of highly significant is played.

The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims Subject to enclosing.

Claims (6)

1. a kind of for fixing the fixture of sample in the liquid phase, which is characterized in that including bottom plate, copper electrode, copper conductor, sealing Pad, fastening bolt and top plate；

Sample is placed on the copper electrode and together by the gasket and is sealed between the top plate and bottom plate, sample table Face region to be modified is contacted by the through-hole on the top plate with liquid phase；

It is fastened between the top plate and bottom plate by the fastening screw, described copper conductor one end is connected with copper electrode, the other end It is connected with positive pole.

2. according to claim 1 for fixing the fixture of sample in the liquid phase, which is characterized in that the fixture and lysate Contact portion is made of the PC plastic and silica gel sealing gasket of acid and alkali-resistance.

3. according to claim 1 for fixing the fixture of sample in the liquid phase, which is characterized in that the top plate and bottom plate Four corners be respectively equipped with fastening bolt.

4. according to claim 1 for fixing the fixture of sample in the liquid phase, which is characterized in that the bottom plate center is dug Square groove, the copper electrode are bonded in groove center by glue, and the copper conductor is inserted by the through-hole of bottom edge Square groove, and be connected with the copper electrode.

5. according to claim 1 for fixing the fixture of sample in the liquid phase, which is characterized in that the roof center is dug It is suitable with dissolution contact area needed for square through hole, clear size of opening and specimen surface.

6. according to any one of claims 1 to 5 for fixing the fixture of sample in the liquid phase, which is characterized in that described Gasket is divided to A and B two kinds of models:

Square through hole is dug in A model gasket, square through hole inner edge size is identical as roof center prescription pore size；

Type B gasket digs square through hole at center, and square through hole inner edge size is identical as bottom plate groove size.