JPH0342784B2 - - Google Patents

Description

Detailed Description of the Invention: a. Field of Industrial Application The present invention solves the problem of surface treatment materials such as paint films, plating, anti-corrosion oil, etc. and metal materials deteriorating and corroding in the natural environment, by artificially increasing their durability. This invention relates to an immersion cycle test device for accelerated corrosion.

b. Prior Art Accelerated corrosion testing methods include a salt spray test and an immersion test, which are widely used, but both are independent tests. However, in recent years, with advances in rust prevention technology, these conventional testing methods now require a long time of over 1,000 hours to produce results. Therefore, recently, cycling tests of immersion and drying have been conducted.

This prior art cycle test will be outlined below using diagrams. FIG. 6 is a front sectional view of the immersion/drying cycle tester. An immersion tank 2 having a rectangular cross section is connected to the lower part of an air tank 1 having a rectangular cross section in a horizontal plane, and a sample 5 is suspended from an arm 4 above a vertical shaft 3 fixed at the center thereof. The vertical shaft 3 can be moved up and down by the crank mechanism 6. FIG. 6 shows a state in which the sample 5 is placed in the air tank 1. At this time, hot air enters the tank through the air outlet 7 and is discharged through the exhaust port 8, and the sample 5 is dried by the hot air. Figure 7 shows the sample 5 immersed in the corrosive liquid in the immersion tank 2. The crank mechanism 6 is activated by the cycle immersion signal, the vertical shaft 3 is lowered, and the sample 5 is immersed in the corrosive liquid. The situation is as follows. or,
Hot air blowing is stopped during the soaking period.

c. Problem to be solved by the invention The cycle test described above involves repeating immersion and drying, but the first problem that is generally recognized is that these two cycles alone are insufficient to accelerate the corrosion test. .

In Japan, there are approximately tens of thousands of salt water spray testers that are widely used as accelerated corrosion testers, but in order to create a cycle tester that can be easily adopted by each company in the same way, we need to make it low-priced. There is a need. Normally, in order to obtain humid conditions, it is necessary to install a temperature and humidity control tank consisting of a humidity tank, a heater, a circulation blower, etc. in addition to the test tank, which is expensive. Therefore, the second problem is to create a structure that is both functional and inexpensive when adding corrosion promoting conditions to the cycle test described above.

d Means for Solving the Problems The present invention adds a wet condition to the conventional cycle to create a three-condition cycle of immersion in a corrosive liquid, drying in the air, and wet (condensation), and reduces the time required for the conventional test. In order to achieve the objective with less than 1/2 of the corrosion rate, we created dew condensation on the sample surface under humid conditions to achieve a corrosion-promoting effect. Furthermore, during the drying test, the upper part of the immersion tank was sealed to block water vapor from the immersion tank to ensure complete drying.

Further, the present invention is a low-cost device that uses a dipping tank to also serve as a humidifying function, without providing a humidifying device consisting of a humidifying tank, a circulation blower, etc.

The immersion cycle test device according to the present invention is
This will be explained with reference to Figures 2 and 3. Figure 1 shows the state of sample immersion. The air tank 1 has a rectangular cross-section in the horizontal plane, and the immersion tank 2, which also has a rectangular cross-section in the horizontal plane, is connected to the lower part of the air tank 1. It is moved up and down by the operation of the motor 9 and crank mechanism 6. In the figure, the vertical shaft 3 is lowered to the lowest end, and the sample is immersed in the liquid. The liquid temperature is adjusted by controlling the heater 11 according to the settings of the temperature controller 10.

Figure 2 shows the state of sample drying. When drying conditions are entered according to the program signal, the motor 9 drives the crank mechanism 6 to raise the vertical shaft 3 upwards, and when it reaches the top, the rectangular shielding plate 12 suspended and fixed from the sample suspension arm 4 is The air tank 1 and the immersion tank 2 are sealed and isolated by a gasket 13 fixed to the lower surface of a rectangular edge projecting around the entire circumference of the inner wall of the immersion tank.
At the same time, the blower 14 is operated to send outside air to the hot air box 15, and the hot air generated by heating by the heater 16 enters the air tank through the air outlet 7 and dries the sample. In this case, the programming device allows high-temperature air drying to be carried out by the action of the temperature regulator 17 and heater 16 during the first arbitrary period of time after entering the drying state, and in the next stage, by the action of the temperature regulator 18 and heater 16. Therefore, low temperature air drying can be performed. The set temperature of the temperature regulator 18 during low-temperature drying is several degrees lower than the control temperature for the next wet state. However, if low-temperature drying is not required, the function of this device may be stopped. Temperature sensing part 1 in temperature controllers 17 and 18
7' and 18' correspond to each other, and the air is discharged from the exhaust port 8.

FIG. 3 shows the state in which the air tank 1 is adjusted to a humid atmosphere. When the program enters the wet state, the motor 9 is activated and the vertical shaft 3 is driven by the crank mechanism 6.
is slightly lowered, the shielding plate 12 is separated from the gasket 13, and is stopped and held with a gap maintained between the air tank and the immersion tank. On the other hand, the humidity temperature is controlled by controlling the heater 11 by setting the temperature controller 19, and the evaporated moisture of the immersion liquid enters the air tank 1 through the gap between the shielding plate 12 and the packing 13, and is regulated. In this case, the amount of evaporated water is automatically replenished. The temperature controller 19 has its temperature sensitive part 19' placed inside the air tank 1.

In this way, sample 5 is exposed to a humid atmosphere, but if low-temperature air drying is performed in the preliminary stage, the sample will be exposed to a higher temperature humid atmosphere, resulting in condensation on the surface of sample 5. do.

Figure 4 shows the operation of the sample up-and-down mechanism during the cycle process of immersion → drying → wetting (condensation) using the apparatus of the present invention. FIG. Figure 4 shows the state of sample 5 when it is immersed, with the crank rod 6-2, which is held at one end by a pivot point around the rotating disk 6-1 of the crank mechanism, lowered to its lowest point. , and the vertical axis 3 and sample 5 are also at the lowest point. Detector 20 for detecting this position
For example, when the disc 6-1 is of a photoelectric type and the hole A penetrated around the disk 6-1 comes to the position of the detector 20, the light from the light source 20' of the detector 20 passes through the hole A and reaches the receiver. 20'' and the disk 6-1 stops.
Similarly, FIG. 4 shows the sample 5 at its highest point and in a dry state, and the sample 5 is at the stopped position when the peripheral hole B of the rotating disk 6-1 reaches the position of the detector 20. Figure 4 shows the rotating disk 6 in a wet state.
This is the position where the hole C around −1 stopped when it came to the position of the detector 20.

e Effect In the present invention, the test conditions of immersion in a corrosive liquid, drying, and wetness (condensation) can be set in any order.
By sealing the immersion tank with a shielding plate, the hot air blowing has a great effect on drying the sample. Under these drying conditions, being able to switch to low-temperature air blowing has important effects as described below.

The humid condition is achieved by lowering the sample and the shielding plate slightly downward, and the evaporated moisture of the corrosive liquid flows into the air tank through the outer periphery of the shielding plate to provide a humid condition to the sample. Prior to this humidification, the sample is exposed to cold air blast and then to hotter steam, resulting in condensation on the sample surface.
Condensation has a great effect on accelerating corrosion.

The present invention exhibits the above-mentioned noteworthy effects, but also has a simple structure and does not require a complicated humidifying device as in the prior art.

f Example FIG. 5 shows an example of a working curve of wet and dry bulb temperature in cycle operation using the apparatus of the present invention in the order of immersion, drying, and wetting (condensation). In this way, the process from the immersed state to the wet state (sample condensation) through hot air drying and low temperature drying could be easily obtained.

g Effects of the Invention According to the present invention, it is possible to easily obtain a moist state without installing a complicated humidification device as in the past, and in a drying test, the structure prevents moisture evaporation, so that complete drying can be easily achieved. In addition, it is possible to easily obtain dew condensation conditions, and it has become possible to provide an immersion cycle testing device that has a much more accelerating effect than conventional cycle testing devices and is cheaper than conventional cycle testing devices.

[Brief explanation of drawings]

1, 2, and 3 are side cross sections of the device according to the present invention and state diagrams during immersion, drying, and wet (condensation); FIG. 4 is a state diagram of the up-and-down mechanism of the device of the present invention;
Figure 5 is a wet and dry bulb temperature diagram for immersion, drying, and wetting.
6 and 7 are side sectional views of the conventional device. 1...Air tank, 2...Immersion tank, 3...Vertical axis,
4... Sample suspension arm, 5... Sample, 6... Crank mechanism, 6-1... Rotating disk, 6-2... Crank rod, 7... Air outlet, 8... Exhaust port, 9... Motor, 10... Temperature controller, 11... Heater, 12
...Blocking plate, 13...Packing, 14...Blower, 15...Hot air box, 16...Heater, 1
7, 18, 19... Temperature controller, 17', 18',
19'...Temperature sensing section, 20...Detector, 20'...Light source, 20''...Photoreceiver, A, B, C...Hole.

Claims (1)

[Claims] 1 The following (a), (b), (c), (d), (
An immersion cycle test device characterized by having all of the structures shown in (e), (a) a heatingable immersion tank stacked under an air tank, and a T-shaped sample suspension rack and a vertical axis in the center thereof; A crank mechanism for moving the body up and down is provided below the dipping tank. (b) An immersion tank shielding plate is fixed at a fixed position in the middle of the vertical axis under the sample suspension rack, and a sealing gasket corresponding to the shielding plate is provided around the lower end of the air tank, and the shielding plate is raised and closed. When a suspended sample is located in an air chamber,
The structure is such that the suspended sample is located in the immersion tank when the lower limit of the shielding plate is lowered. (c) Set the stopping position of the shielding plate at the lower limit position during a immersion test, at the upper limit position that closes off the air tank and the immersion tank during a dry test, and between the sealing gasket and the sealing plate during a wet test. A position detector is provided on the crank mechanism to set the position where a gap is formed between the two. (d) Provide a hot air box on the side of the air tank and an exhaust port on the side opposite to the air outlet connected to the blower. (e) In order to conduct a cycle test by switching between the immersion, drying, and wet tests, a program device is provided to control the operation of the crank mechanism, hot air box, and blower.