JP2011231372A - Test device for oxide film removal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxide film removing test device which can continuously confirm the change with time in removal of scales (oxidized film) remarkably simply.SOLUTION: The oxide film removing test device 10 is used to examine oxide film removing capability by flowing an acid liquid 3 along the surface of a test piece 1 made of metal having an oxide film formed on the surface. The oxide film removing test device 10 includes flow passages 11 to 16, etc. for flowing an acid liquid 2 along the surface of the test piece 1 and having a viewing window 14 through which the surface of the test piece 1 can be observed.

Description

  The present invention relates to an oxide film removal test apparatus for testing an ability to remove an oxide film by circulating an acid solution on the surface of a test piece having an oxide film formed on a metal surface.

  When a metal is heated to a high temperature in an air atmosphere, the surface of the metal is oxidized and an oxide film (scale) is generated on the surface. For this reason, the steel strip that has been subjected to hot working or heat treatment in an air atmosphere is subjected to pickling treatment to remove scale by running in a pickling tank in which an acid solution is stored. In this pickling treatment, the type and thickness of the scale to be produced vary greatly depending on various conditions such as the material of the steel strip and the heating temperature. I am doing so.

  As a conventional test apparatus for obtaining the conditions for removing such scale in advance, for example, as described in Patent Document 1 below, a test piece is placed in a pickling tank filled with an acid solution, The acid solution is heated and kept warm by a heater, and a disk is rotated to generate a liquid flow in the acid solution, thereby creating a relative speed difference between the acid solution and the test piece. Proposals have been made so that the test can be performed in the same pickling state as in the case.

Japanese Patent Laid-Open No. 6-081179

  By the way, in the conventional test apparatus proposed in the above-mentioned Patent Document 1 or the like, in order to continuously check the change over time for removing the scale, after performing the above test every various times, Since it was necessary to observe the state of the scale of each test piece, it was very time-consuming.

  In view of the above, an object of the present invention is to provide an oxide film removal test apparatus in which it is very easy to continuously check changes with time in removing scale (oxide film).

  In order to solve the above-mentioned problem, the oxide film removal test apparatus according to the first invention has an ability to remove an oxide film by circulating an acid solution on the surface of a test piece having an oxide film formed on a metal surface. And a flow passage having a viewing window through which the acid solution can be circulated on the surface of the test piece and the surface of the test piece can be visually observed.

  In the oxide film removal test apparatus according to the second aspect of the present invention, in the first aspect of the present invention, the flow path extends along the vertical direction so that the liquid contacts the surface of the test piece along the vertical direction. It is provided.

  The oxide film removal test apparatus according to a third aspect of the present invention is the second aspect of the invention, wherein the pretreatment liquid feed means for circulating the pretreatment liquid from the lower side to the upper side of the flow path, and the lower side of the flow path. An acid solution feeding unit that circulates the acid solution from the upper side to the upper side, and a post-treatment liquid feeding unit that circulates the post-treatment solution from the lower side to the upper side in the flow path. .

  According to the oxide film removal test apparatus according to the present invention, since the surface of the test piece can be visually observed from the observation window of the flow path, it is very important to continuously check the change over time in removing the oxide film. Easy to do.

It is a schematic block diagram of main embodiment of the oxide film removal test apparatus which concerns on this invention. FIG. 2 is a sectional view taken along the line II-II in FIG. 1.

  Embodiments of an oxide film removal test apparatus according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to only the embodiments described with reference to the drawings.

[Main embodiments]
A main embodiment of an oxide film removal test apparatus according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, a notch groove 11 a is formed along the vertical direction on the front surface of the base column 11 erected in the vertical direction. A holder hole 11b is formed in a central portion in the horizontal direction near the upper side of the notch groove 11a on the front surface of the base column 11. A holder 12 for holding the test piece 1 is detachably disposed in the holder hole 11b.

  An attachment plate 13 is detachably attached to the notch groove 11a of the base column 11. A channel groove 13a is formed along the vertical direction in the horizontal central portion of the mounting plate 13 facing the base column 11. A peep hole 13b that communicates with the flow channel groove 13a is formed in the horizontal central portion near the upper front side of the mounting plate 13 so as to face the holder hole 11b of the base column 11.

  A viewing window 14 made of a transparent glass plate is disposed in the viewing hole 13b of the mounting plate 13 so as to partition the viewing hole 13b and the flow channel groove 13a. A frame-type pressing frame 15 that fixes the viewing window 14 to the viewing hole 13b is detachably attached to the viewing hole 13b of the mounting plate 13. On the front surface of the viewing window 14, an imaging device 25, which is a recording means such as a microscope supported by a moving stage 25 a, is disposed so as to face the flow channel groove 13 a of the mounting plate 13.

  A holding bolt 16 that presses the holder 12 against the mounting plate 13 is screwed between the holder hole 11 b and the back surface of the base column 11. A communication hole 11 c that communicates between the lower end side of the flow channel groove 13 a of the mounting plate 13 and the back surface of the base column 11 is formed in a horizontal central portion near the lower side of the base column 11. A communication hole 11 d that communicates between the upper end side of the flow channel groove 13 a of the mounting plate 13 and the back surface of the base column 11 is formed in the central portion in the horizontal direction near the upper side of the base column 11. A relief hole 11e is formed between the upper end surface of the base column 11 and the communication hole 11d so as to communicate therewith.

  The communication holes 11c of the base column 11 have magnet pumps 21A to 21C and ball valves 22A below a plurality of (three in this embodiment) storage tanks 18A to 18C disposed inside the protective pan 17. Are connected via a supply line having ~ 22C. The communication holes 11d of the base column 11 communicate with the liquid storage tanks 18A to 18C via recovery lines having ball valves 23A to 23C and strainers 19A to 19C, respectively. Between the vicinity of the downstream side of the ball valves 22A to 22C of the supply line and the vicinity of the upstream side of the ball valves 23A to 23C of the recovery line via respective bypass lines having ball valves 24A to 24C, respectively. It is connected. The liquid storage tanks 18A to 18C are respectively provided with heaters 20A to 20C for heating and keeping the inside of the liquid storage tanks 18A to 18C at a predetermined temperature.

  In addition, the flow path groove 13 a of the mounting plate 13 has a length C between a communication portion with the communication hole 11 c of the base column 11 and a lower end of the test piece 1 held by the holder 12. The size satisfies the relationship of the following expressions (1) and (2).

C> 5de (1)
de = 4S / L (2)
Where de is the hydraulic diameter of the flow channel 13a (equivalent diameter of the cross section of the flow channel 13a), S is the cross-sectional area perpendicular to the flow direction of the flow channel 13a, and L is the flow channel 13a. The wet edge length (the length at which the fluid contacts the flow channel 13a in the flow direction).

  In the present embodiment, the base column 11, the holder 12, the mounting plate 13, the viewing window 14, the holding frame 15, the holding bolt 16, and the like constitute a flow path, and the liquid storage tank 18A. The strainer 19A, the heater 20A, the magnet pump 21A, the ball valves 22A to 24A, and the like constitute pretreatment liquid supply means, and the liquid storage tank 18B, the strainer 19B, the heater 20B, and the magnet pump. 21B, the ball valves 22B-24B and the like constitute an acid solution feeding means, and the post-treatment is performed by the liquid storage tank 18C, the strainer 19C, the heater 20C, the magnet pump 21C, the ball valves 22C-24C, etc. A liquid feeding means is configured.

  Next, an example of the oxide film removal test method using the oxide film removal test apparatus 10 according to this embodiment will be described.

  First, after attaching the test piece 1 to the holder 12, the attachment plate 13 is attached to the notch groove 11 a of the base column 11, and then the holding bolt 16 is adjusted to attach the holder 12 to the attachment plate 13. The test piece 1 is securely clamped between the holder 12 and the mounting plate 13 by pressing toward the front.

  Subsequently, after the viewing window 14 is fitted into the viewing hole 13b of the mounting plate 13, the holding frame 15 is fitted into the viewing hole 13b of the mounting plate 13, so that the viewing window 14 is mounted. The plate 13 is fixed to the peep hole 13b.

  Next, the temperature control water 2 as a pretreatment liquid is put into the liquid storage tank 18A, and an acid solution 3 having a specified concentration such as a hydrochloric acid aqueous solution or a sulfuric acid aqueous solution is put into the liquid storage tank 18B, and further the liquid storage tank After the rinse liquid 4 having a defined composition as a post-treatment liquid is put into 18C, the heaters 20A to 20C are operated to heat the liquids 1 to 3 to a specified temperature. Then, the magnet pump 21A is activated. At the same time, when the ball valves 22A and 23A are opened, and the ball valve 24A is closed, the temperature control water 2 passes through the communication holes 11c of the base column 11 in the flow channel groove 13a of the mounting plate 13. After flowing from below to above and preheating the test piece 1 and the like to a prescribed temperature, the test piece 1 is recovered to the liquid storage tank 18A through the communication hole 11d and reused.

  When the test piece 1 or the like is preheated to a prescribed temperature in this way, the ball valve 22A is closed and the operation of the magnet pump 21A is stopped, while the ball valve 24A is opened to open the mounting plate. After the temperature-controlled water 2 in the 13 flow channel grooves 13a is collected in the liquid storage tank 18A, the ball valves 23A and 24A are closed.

  Subsequently, the imaging device 25 is operated to start imaging, and the magnet pump 21B is operated and the ball valves 22B and 23B are opened. On the other hand, when the ball valve 24B is closed, the acid solution 3 is added to the base. Through the communication hole 11 c of the column 11, the mounting plate 13 circulates in the flow path groove 13 a from below to contact the surface of the test piece 1, and the surface of the test piece 1 is pickled. After the treatment, the liquid is collected in the liquid storage tank 18B through the communication hole 11d and reused.

  As a result, the surface of the test piece 1 is photographed through the viewing window 14 from the viewing hole 13b of the mounting plate 13 by the photographing device 25 while being pickled with the acid solution 3, and an oxide film (scale) is obtained. ) Can be recorded continuously over time.

  When the surface of the test piece 1 is pickled for a specified time in this way, the ball valve 22B is closed and the operation of the magnet pump 21B is stopped, while the ball valve 24B is opened to open the mounting plate. After the acid solution 3 in the 13 channel grooves 13a is collected in the liquid storage tank 18B, the ball valves 23B and 24B are closed.

  Subsequently, when the magnet pump 21C is operated and the ball valves 22C and 23C are opened while the ball valve 24C is closed, the rinsing liquid 4 passes through the communication hole 11c of the base column 11 and the mounting plate. After the surface of the test piece 1 is rinsed (post-processed) through the channel groove 13a from the bottom to the top, it is recovered in the liquid storage tank 18C through the communication hole 11d. Will be used again.

  When the rinsing process on the surface of the test piece 1 is performed for a specified time in this way, the operation of the imaging device 25 is stopped to complete the imaging, the ball valve 22C is closed, and the operation of the magnet pump 21C is stopped. On the other hand, by opening the ball valve 24C, the rinse liquid 4 in the flow channel groove 13a of the mounting plate 13 is collected in the liquid storage tank 18C, and then the ball valves 23C and 24C are closed.

  Then, the holding frame 15 is removed from the mounting plate 13 and the viewing window 14 is removed from the viewing hole 13b of the mounting plate 13, and the holding bolt 16 is adjusted to pull the holder 12 away from the mounting plate 13. After that, the mounting plate 13 is removed from the base column 11 and the test piece 1 is removed from the holder 12 to complete the oxide film removal test.

  Therefore, according to the oxide film removal test apparatus 10 according to the present embodiment, the following effects can be obtained.

(1) Since the observation window 14 that allows the surface of the test piece 1 to be visually observed is provided, it is very easy to continuously check the change over time for removing the scale.

(2) The flow path groove 13a of the mounting plate 13 is provided along the vertical direction, and the liquids 2 to 4 are circulated so as to contact the surface of the test piece 1 from below to above along the vertical direction. Therefore, even if bubbles are generated in the flow channel groove 13a, the bubbles can be easily extracted to the outside from the escape hole 11e of the base column 11, and the test accuracy can be improved.

(3) Since the length C of the flow path groove 13a of the mounting plate 13 is large enough to satisfy the relationship of the equations (1) and (2), the liquid 2 to flow through the flow path groove 13a. 4 boundary layers can be sufficiently developed, and the test accuracy can be improved.

(4) Since the acid solution 3 can be circulated after the temperature-controlled water 2 is circulated and the test piece 1 and the like are preheated to a prescribed temperature, the test accuracy can be improved.

(5) Since the rinsing solution 4 can be circulated after the acid solution 3 is circulated, the pickling treatment can be performed under the same conditions as the actual pickling equipment, and the test results are more realistically approximated. Can be made.

  In addition, it is good to comprise or coat at least the part (except for the observation window 14) which contacts the said acid solution 3 with the material which has acid resistance like a polypropylene and a fluororesin.

[Other Embodiments]
In the above-described embodiment, the temperature adjustment water 2, the acid solution 3, and the rinsing solution 4 are circulated to perform the scale removal test. However, the present invention is not limited to this, and as other embodiments, For example, a plurality of acid solution feeding means are provided so that a plurality of types of acid solutions can be circulated sequentially through the flow channel groove 13 a of the mounting plate 13, or other various fronts can be used instead of the temperature control water 2. By allowing the treatment liquid to flow through the flow path groove 13a of the mounting plate 13, various pretreatments are performed on the test piece 1 together with preheating of the test piece 1 or the like, and in addition to the rinse liquid 4, By allowing various post-treatment liquids to flow through the flow path grooves 13 a of the mounting plate 13, various post-treatments can be performed on the test piece 1 together with the rinse treatment of the test piece 1.

  The oxide film removal test apparatus according to the present invention can be used extremely beneficially industrially because it is very easy to continuously check the change over time in removing the oxide film.

DESCRIPTION OF SYMBOLS 1 Test piece 2 Temperature control water 3 Acid solution 4 Rinse solution 10 Oxide film removal test apparatus 11 Base column 11a Notch groove 11b Holder hole 11c, 11d Communication hole 11e Escape hole 12 Holder 13 Mounting plate 13a Channel groove 13b Peep hole 14 Peep Window 15 Pressing frame 16 Pressing bolt 17 Protective pan 18A-18C Storage tank 19A-19C Strainer 20A-20C Heater 21A-21C Magnet pump 22A-22C, 23A-23C, 24A-24C Ball valve 25 Imaging device 25a Moving stage

Claims (3)

An oxide film removal test apparatus for testing the removal ability of an oxide film by circulating an acid solution on the surface of a test piece having an oxide film formed on a metal surface,
An oxide film removal test apparatus comprising: a flow passage having a viewing window through which the acid solution can be circulated on the surface of the test piece and the surface of the test piece can be visually observed. In the oxide film removal test apparatus according to claim 1,
The said oxide film removal test apparatus characterized by the above-mentioned. The said flow path is provided along the perpendicular direction so that the said liquid may contact with the surface of the said test piece along a perpendicular direction. In the oxide film removal test apparatus according to claim 2,
A pretreatment liquid feeding means for circulating a pretreatment liquid from below to above in the flow passage;
An acid solution feeding means for circulating the acid solution from below to above in the flow passage;
And a post-treatment liquid feeding means for circulating the post-treatment liquid from below to above in the flow passage.

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