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1、J I S H+0530 93 W 4733608 05LbL 396 W Printed in Japan UDC 543.257.31669.35-462:621.183/. 184 JIS JAPANESE INDUSTRIAL STANDARD Measurement methods of polarization resistance of copper alloy tubes for condenser Translated and Published bY Japanese Standards Association Copyright Japanese Standards As
2、sociation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 07:15:59 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Hu0530 93 m Y933608 0516190 008 m In the event of any doubt arising, the original S
3、tandard in Japanese is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 07:15:59 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S H*0530
4、 93 4933bOB 05LbLL T44 = UDC 543.257.3 : 669.35-462 : 621. 1831.184 JAPANESE INDUSTRIAL STANDARD J I S Measurement methods of polarization H 0530-1993 resistance of copper alloy tubes for condenser 1. Scope This Japanese Industrial Standard specifies the measurement method of polarization resistance
5、 of copper alloy tubes for condensers made of brass, white copper, or the like. 2. Definitions The main terms used in this Standard are defined as follows: (1) polarization The producing of relative displacement of the electric potential of the testing tube to the natural electrode potential by appl
6、ying - - an electric current from an outer power source to the interface of the testing tube and the solution, or the status thereof. (2) polarization resistance The status that an electric potential is applied so that an electricity passes according to the Ohms law in the process of corrosion of a
7、metallic material. In this case, the polarization resistance value is computed from formula (1). O (1) AE i R, = - . . . where, R, : polarization resistance value of the testing tube (Q-cm2) that is, relative polarization value to the natural electrode potential (mV) dE : electric potential applied
8、to the testing tube, i : measured electric current density (mA/cm2) A synthetically regulated salt water to afford almost (3) artificial seawater the same affects as those of seawater. (4) reference electrode An electrode made of silver-silver chloride, etc. used for determination of an electric pot
9、ential of a copper alloy immersed in a solution. send an electric current to the testing tube. face between the testing tube and the solution when the testing tube is immersed into the solution. picking out tube from condenser outside from a condenser for measurement of polarization resistance. pick
10、ing out operation. measurement. (5) counter electrode (6) natural electrode potential Another electrode made of platinum plate, etc. used to An electric potential produced at the inter- (7) (8) picked out tube (9) testing tube An operation of picking out a tube to A tube which is taken to the outsid
11、e of a condenser by A short tube being cut out from a picked out tube for Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 07:15:59 MDTNo reproduction or networking permitted without license
12、 from IHS -,-,- J I S “I530 93 m 4933608 05LbL92 980 m 2 H 0530-1993 (10) new tube A tube of the same quality as the testing tube and of a new one of which the inside surface is free from contamination or the like. 3. Preparation of testing tube 3.1 tions to condenser Preparation of testing tube for
13、 evaluation under actually equipped condi- 3.1.1 Summary pump, blow the water box rapidly, plug the relevant tube, and keep the wet conditions inside of the said tube until the picking out tube from the condenser. After picking out the tube, take appropriate disposition so as to keep the wet conditi
14、ons continuously, stopper plugs, and carry to the place of practice for measurement. After discontinuance of the operation of the circulating water 3.1.2 tation shall be carried out as follows: Picking out tube and transportation Picking out the tube and transpor- (1) (2) After discontinuance of the
15、 operation of the circulating water pump, blow the water box rapidly. After blowing the water box, open the manhole(s) rapidly, identify the inside of the tube maintains wet state, and stopper with rubber plugs the both ends of the tube to be picked out. After the completion of preparatory work for
16、picking out the tube, take off the rubber plugs tentatively, and pick up the tube. In the case of cutting the picked out tube to short length, use an appropriate cutting device which is liable not to adhere the chips to the inner surface of the tube. Stopper instantly the both ends of the picked out
17、 tube with rubber plugs. If the inside of the picked out tube is liable to dry up, wet it with appropriate amount of filtered cooling water (l) or 3 % - sodium chloride solution. (3) (4) (5) Note (l) Cooling water filtered with a filter of 0.47 ym. (6) Pertaining to the picked out tube, enter the ne
18、cessary items such as direction of flow of cooling water, sequence counted from the entrance, and the top and bottom of the tube in the condenser while servicing. Envelop the picked out tube with a cushion material, further put in a wooden box or container of good heat insulating property, and carry
19、 it to the place of practice for measurement. Must not expose the picked out tube to the direct sunlight, and also must not subject to rapid change of temperature. (7) (8) 3.1.3 Tube preservation pletion of blowing the water box to the time of measurement is as short as It is preferable that the dur
20、ation days from the com- possible. Do not make measurement if it elapses 30 days or more. a a a a Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 07:15:59 MDTNo reproduction or networking p
21、ermitted without license from IHS -,-,- J I S Hx0530 93 m 4933608 0516193 817 m 3 H 0530-1993 In addition, it is prohibited to expose the picked out tube to the direct sunlight, or to subject to rapid change of temperature. 3.1.4 out as follows: Cutting out of test tube Cutting out of the testing tu
22、be shall be carried (i) (2) Detach the plugs from the picked out tube. It is preferable to cut out as many testing tubes as possible. In the case where only one testing tube is measured, this tube shall be cut out from the mid-portion of the picked out tube. If this is infeasible, cut out a testing
23、tube from a portion not less than 2 m apart from the entrance and exit ends of the picked out tube, respectively. In cutting out, select the portion where the peeling of adhered substance is as little as possible and further it is not dried up. (3) 3.2 Preparation of the testing tube for evaluation
24、after drying up shall be carried out as follows: Preparation of testing tubes for evaluation after drying up 0 (i) (2) After arrival in the place of practice for measurement, detach the plugs from the picked out tube. It is preferable to cut out as many testing tubes as possible. In the case where o
25、nly one testing tube is measured, this tube shall be cut out from the mid-portion of the picked out tube. If this is infeasible, cut out a testing tube form a portion not less than 2 m apart from the entrance and exit ends of the picked out tube, respectively. In cutting out, select the portion wher
26、e the peeling of adhered substance is as little as possible. In the case where the inside of the tube is not dried up, it shall be dried up by leaving in a clean room where the direct sunlight does not stream in. (3) (4) 4. Measurement method of polarization resistance 4.1 Summary After electrically
27、 insulating treatment is conducted to those portions as outside surface of the testing tube which contacts with the test solution, cross-section of the ends and inside surface where adhered substance is fallen off, immerse the testing tube into the test solution for the specified period, and restore
28、 its inside surface to the in-servicing conditions as far as possible. Attach the testing tube to the testing apparatus, and make measurement while the test solution is run at a specified flow velocity. 4.2 Category of measurement methods The measurement method of pola- rization resistance shall con
29、form to either one of the following: (i) Large polarization method A method to obtain the polarization resistance calculated from the electric potential and its corresponding electric current when a specific quantity of cathodic polarization displaced from the natural electrode potential of the test
30、ing tube is applied to the testing tube. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 07:15:59 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 H 0530-1993 (2)
31、 Small polarization method A method to obtain the polarization resis- tance calculated from the electric current and its corresponding electric potential when a small electric current is sent to the testing tube. 4.3 Large polarization method 4.3.1 Apparatus typical construction is shown in Fig. 1.
32、The apparatus shall be as given in the following, and a (3 Potentiostat An instrument to set electric potential and to measure electric current. In order to make measurement very accurately, it is preferable that the input impedance for the measuring circuit of electric potential of the potentiostat
33、 is lo9 i 2 or more and the response time is not more than s. With this respect, a potentiostat shall connect a recorder to monitor always the variation of electric Potential and current. Measuring cell (fitting portion of testing tube) The cell is made of elect- e rically insulating material such a
34、s polyvinyl chloride resin, polyacrylic resin and glass, and attachable of a reference electrode, counter electrode and testing tube. In addition, the construction is capable to let flow the test solution at a specified flow velocity. An example of measuring cell is shown in Fig. 2. Water running ap
35、paratus The apparatus is composed of a water tank, conveying pump, flowmeter, flow control valve and piping for water run- ning, and shall conform to the following requirements. Further, the portion which contacts with the test solution should be composed of electrically insulating material as far a
36、s possible. (a) Flowmeter (b) Water tank A flowmeter which is capable to measure accurate to The tank shall have sufficient capacity to maintain f. 1 % shall be used. the testing solution at a specified temperature, otherwise to provide a temperature control device composed of a piping for cooling a
37、nd electric heater, etc. e Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 07:15:59 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S H*530 73 = 4733608 05LbL5
38、 bT Temperature control device - - - - - - _ - - 5 H 0530-1993 Piping for water running 1 I I Potentiostat Recorder 1 I I I L-J r- I Counter electrode / Reference electrode - Flowmeter v .1 - -i - Flow control _ valve Fig. 1. Construction of testing apparatus for large polarization method (example)
39、Direction of water running Fig. 2. Measuring cell (fitting portion of testing tube) (example) Counter electrode A Reference electrode w -1 I I Testing tube Electrically insulated cell 150 mm to 200 mm 4.3.2 Reference and counter electrodes The reference and counter electrodes shall be as given in th
40、e following: (i) Reference electrode Use directly or through a salt bridge a 3.33 mollEKC1 silver - silver chloride electrode or saturated colonel electrode. Arrange two or more reference electrodes, and measure the electric potential of the identical metal to each electrode in the test solution. Us
41、e the electrodes when they are confirmed that the difference between measured values is within 3 mV. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 07:15:59 MDTNo reproduction or networkin
42、g permitted without license from IHS -,-,- JIS Hx0530 93 m 4933608 05LbLb 526 m 6 H 0530-1993 Remarks: Since a reference electrode has a tendency of approximately o 1 mV/“C affected by temperature, do not vary the temperature of the reference electrode during measurement in the case where the quanti
43、ty of polarization in small that is not more than -10 mV or the salt bridge is used. (2) Counter electrode Use a platinum wire, platinum plate or platinum coated titanium wire. 4.3.3 Chemicals The chemicals shall be as given in the following: (1) Test solution (2) Insulating material Use artificial
44、seawater or the water equivalent thereto. The insulating material shall conform to either one in the following: (a) Manicure Use the commercial grade ones. (b) Paint Use tar-vinyl corrosion-protective paint of rapid curing type o at an ordinary temperature. 4.3.4 Size of testing tube length. The tes
45、ting tube shall be approximately 10 cm in 4.3.5 outside surface of the tube shall be treated as follows: Treatment applied to ends and outside surface of tube The ends and Remove burrs of the ends of the tube with a knife, file, or the like. Connect electrically the lead wire for measurement. Coat w
46、ith manicure or paint the portion where is not maintained the inherent conditions due to the ends of the tube, outside surface portion of the tube which contacts with the test solution during the test and falling out of the film, and then conduct electrically insulating treatment (painting for insul
47、ation). Coat at least twice. In the case where the film inside the tube is liable to dry up at the time of painting, stopper a rubber plug to one end of the tube, let stand perpen- dicularly the testing tube which is filled with the test solution, and coat one end to the other end in order. 0 After
48、completion of painting, identify visually whether any uncoated portion is left or not. Preparation of measurement The preparation of measurement shall be carried out as follows: (1) Immerse preliminarily the testing tube into the test solution of room tem- perature for 24 h to 72 h. In the case of measurement for an old tube, etc. with hardened films, immerse the test tube for 72 h or more if the variation of the natural electrode potential does not fall within 2 mV/min. Attach the counter electrode to the measuring cell. (2) Copyright Japanese Standards Association Provid