This part of GB/T 18570 specifies the field assessment method for the moisture on steel surfaces due to condensation of water before coating. This method is applicable to flat or slightly curved horizontal and vertical surfaces, and is not applicable to surfaces exposed to dripping water such as rain or condensation. GB/T 18570.8-2005 Surface preparation of steel before coating - Test for assessment of surface cleanliness - Part 8: Field refractometry of moisture GB/T18570.8-2005 Standard download decompression password: www.bzxz.net
This part of GB/T 18570 specifies the field assessment method for the moisture on steel surfaces due to condensation of water before coating. This method is applicable to flat or slightly curved horizontal and vertical surfaces, and is not applicable to surfaces exposed to dripping water such as rain or condensation.

ICS 25.220. 10
National Standard of the People's Republic of China
GB/T18570,8—2005/IS0 8502-8:2001 Preparation of steel surfaces before application of paints and related products
Tests for the assessment of surface cleanliness
Part 8: Field refractometric determination of moisture mioistureIS08502-8:2001.JDT)
2005-09-14 Issued
General Administration of Standardization Administration of the People's Republic of China
2006-04-01 Implementation
GB/T18570.8-2005/1S0B502-B.20Q1GB/11B570% polyester coating before steel surface treatment and surface cleaning The test is divided into the following parts: calculation part, field test of bacterial products of soluble iron (technical report);? Part 1: Determination of the presence of fluorides on cleaned surfaces; Part 2: Evaluation of dust on clean surfaces before painting (pressure sensitive adhesive tape method); Part 3: Evaluation of the presence of fluorides on clean surfaces before painting (pressure sensitive adhesive tape method); Part 4: Evaluation of the possibility of fluoride on steel surfaces before painting (substrate detection method); Part 5: Determination of fluoride on steel surfaces before painting (substrate detection method); Part 6: Sampling of soluble substances by the Bruce method; Part 7: Field determination of fluoride and lipids; Part 8: Field refractometry of moisture; Part 9: Field determination of water contact point; Part 10: Field determination of water contact point; Part 11: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 12: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 13: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 14: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 15: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 16: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 17: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 18: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 19: Field determination of fluoride on steel surfaces before painting (substrate detection method); Part 20: Field determination of fluoride on steel surfaces before painting Part 1, On-site determination of water-soluble fluorides; Part 11: On-site determination of water-soluble sulfides; Part 12, On-site determination of water-soluble iron ions: Part 1: Field conductivity determination of soluble salts, this part is Part 8 of GB/T 1837C, this part is equivalent to Part 1) 85028:2C021 Assessment of the cleanliness quality of steel surface treatment materials with pre-coated materials Part 1: On-site refraction determination of moisture (English version) This part is the same as GB/T 1308:0282101.
For the purpose of maintaining the original standard, the following editorial changes are made to this part: (1) the term "this International Standard" is changed to "this part"; (2) the decimal point is replaced by "", the comma is replaced by "", and the period is replaced by "; except for the requirements of the International Standard, this part is prepared by China Shipbuilding Industry Corporation and is authorized by the National Technical Committee on Standardization of Paints and Pigments; (3) the term "this part" is changed to "this part"; (4) the term "this International Standard" is changed to "this part"; (5) the term "this part" is replaced by " This part was drafted by: China Shipbuilding Industry Research Institute, China Shipbuilding Industry First Research Institute, this part was drafted by: Yu Hongren, Song Yannu, Liu Shupin, Fu Jianhua, 1 Scope
GB/T18570.8—2005/1S08502-8.2001 Surface preparation of steel before coating
Test for evaluation of surface cleanliness
Part 8 Field refractometry for determination of moisture
B/T15570.8—2005/1S08502-8.2001 Surface preparation of steel before coating
Test for evaluation of surface cleanliness
Part 8 Field refractometry for determination of moisture
B/T15570.8—2005/1S08502-8.2001 Surface preparation of steel before coating
Test for evaluation of surface cleanliness wwW.bzxz.Net
Part 8 Field refractometry for determination of moisture
This section specifies the method for on-site assessment of moisture content of steel surfaces before coating. This method is applicable to small flat or slightly empty vertical surfaces, not to surfaces exposed to water such as water or dew. This method can detect the minimum surface moisture (water) before coating of 4R/m. For accuracy below this value, see Chapter 2. Normative references
The following documents have become the terms of this part through the availability of this part of GB/118570. References during production The following requirements apply to all storage and collection orders (excluding the internal pipes that are not moved) or how to order the order: however, the latest version of the wood part is not applicable: the latest version of the document with the date is applicable.
B/T167.62005 Surface treatment of shaved materials before painting Surface deactivation test Part 6: Extrudable frame quality Feleda (15 () R502-6: 1995.IDT) [S] 353: 187 Analysis and experiment etc. Water specification and test method 3 Principle
On a part of the steel surface, a mixture of glycol and water is used as a fire agent. Use Bresr Cloud See GH/18:7t, 6-2003 to take moisture from the surface (usually also the moisture in the air). Before and after weighing, use a refractometer to measure the refraction of glycol in the mixture of glycol and water to calculate the density of the surface moisture (water) 4 Reagent
should be 50:! The current 3-pole purity requirement. 4. 2 Ethylene glycol is analytically pure.
5 Receiver
5.1 Glass bottle
with a volume of several, with a ground version of the plug. 6.2 Adhesive tape
especially required, the bite tape is the model A-*230 specified in 4.1 of C≤/T18571.5-2>1>5, 5.3 Protective bottle
bite three-plate adhesive tape bag (5.2) hollow treatment material is the same 5.4 Plastic brush
Plastic brush is nail type or its type, 169 is non-equivalent 03.[
GR/T18570.8—2005/ISO 8507-8:20015.5 Injection with a syringe
If there are no other requirements, the syringe volume is 1T1. 5.6 Portable refractometers
Refractometers are used to measure the content of certain ingredients in the sample. The test procedures specified in this part use a conventional instrument called Bix. This instrument is used to measure the sugar content in the water. The minimum interval should be consistent with the sugar concentration not exceeding 1.2%. Its range should cover at least the range of 30%~50% concentration value
When used in non-sugar water, such as wood test, the Bix instrument will show a reading that is consistent with the concentration of the measured water or the positive number, which is the concentration of ethylene in water.
Usually this model of refractometer uses Hrix units. 1 Trix unit is equivalent to 1% of the sugar content in the solution. The Hrix unit is not an international unit.
6 Steps
6.1 Preparation of the test surface
6.1.1 Select a test area. If the selected steel surface is clean enough to ensure that the adhesive is firmly attached, it is not necessary to perform the operations of 6.1.2-6.1.4.
6.1.2 Place the test area on the surface of the sawn timber with a short thickness. In order to avoid the test area being limited by the number of films, it is advisable to use a film with an edge (about the same as the test area). Only a very small part of the test surface (about 2 mm) should be used. The test area should be the same as the test area ... 1.4 Cloud migration catalytic performance:
6.1.5 Remove the film filling protective paper and the material of the cavity. 61.6 On the steel tree surface, stick the glue tightly, and quickly stick the cavity to the good whole. In the test of the selective effect, stick the late fine viscosity to the clean area: make sure the frame sticks half way back. 6.2 Preparation of separation agent
Put an appropriate volume of water (such as 10mL) and a volume of 7.. (4.2) (such as 20m) in a glass bottle (5.1) to prepare the drop agent, put it on the ground, and operate it to make it whether it is | |tt||Note: The reading will be proportional to the initial concentration of B in the agent.
B.4 Air (water) will be removed from the steel surface
and the agent will be removed from the steel surface.
B.4 Air (water) ... (5.5), and then inject back into the glass bottle, repeat the ratio of 2 times, a total of 3 times. No other requirements, put 11ml. of the agent into the social injection device, inject the elastic film and steel structure of the injection, make the needle only penetrate the elastic bed and point the needle from the upper paint of the travel patch, according to the provisions of (BT18ETU.e-2335), inject the potential agent into the cavity, and then withdraw at least 1% of the injection into the syringe. After the period, the agent is withdrawn from the syringe.
6.5 Refractometer
Drop about 3 full of liquid in the frequency capture emitter onto the refractometer and record the reading t: the unit is percentage (%). This number is proportional to the density of ethylene in the melt.
7 Results are given in
GB/T18570.8—2905/TSO8502-8,2001. After 6,5 measurements, the density of the gas (water) is in grams per meter (g/m). Calculate according to formula (1). Note: The formula is used as the effective value after conversion, that is, all quantities should be calculated in the form of corresponding units, not international units. Convert them to their international median units.
In the formula,
the value of the moisture (water) mass removed from the surface of the adhesive cavity, in grams: A
try to round the area to square (m). The m in formula (1) is calculated according to formula (2),
-10×0
the density of moisture (the moisture) is 1000kg/m), center V——-6.1 is the value of the volume of moisture (water) taken from the surface, in units of cubic meters (m). According to the provisions of 6.5, the new value is proportional to the micro-orthogonal density of ethylene glycol, and the formula (3) is obtained: _V+a
In the formula,
3. is the value of the dissolved volume in cubic meters) 3.3 is the reading of the near-field probe,
6.5 is the reading of the near-field probe.
Formula ((1) Formula (2) Formula (3) The unit is kilograms per square meter (g/m) according to the public or (4 calculation Ga
1000×一
Example Y=1ml see 6.4).A-1250m see.2) Formula 3 calculates: 0.8
Where 0, the position is in Beijing per square meter (k/\) (return to international document system). Formula 5) The effective value obtained is multiplied by 1U\, and it is obtained in grams per square meter The formula (5) with the unit of g/㎡ is multiplied by 1n to get the value of mg/m2 (mg/cm2). If different volumes of the reagent are taken, the different V values ​​are substituted into the formula (1) to get the formula of the same formula. Figure 1 shows the three different calculation formulas for the control of the line, 1
CE/T18570.8—2005/ISO8502-8:20014
=u. rhmd.
(n >r
Calculation: The actual volume of the dew in the syringe is the ratio of the surface moisture (water) density to (n-m)/n when the model is A-1250. The accuracy of the density
measurement depends on several factors. The change of temperature in the latent agent used is not significantly affected by latent impurities. If there are any, they are not small and have been marked. However, in practice, the change of most parameters, except the resolution of the refractometer, can be ignored. "Of course, Hrix The resolution is equal to or equal to the interval between the scales above, that is, the difference between the reading and the reading is not greater than ±1%, so it can be determined that the error is not greater than 3U.2%. Using a specific scale (see 6.2\, the surface degassing is usually displayed under normal circumstances, that is, Pg/m2, n, 41). According to the formula [4], Pn can be calculated and its value is a certainty: this accuracy must be: when reading with 1mI. fill and model A-1253 adhesive tape cracking, the amount of surface moisture (water) that can be determined is 1g/m2
when using a single agent (0.GL) and a double-diameter small square bottom tape (A2500), the amount of moisture (water) between the surfaces can be determined to be 2) BRESLL,A.,lield dererninetion od moisture. on nrtn. surtasrs, Japastrial Cormuian.3esn:ary/Mach ys+.2,PF.20-21,
CH/T18570.8—2005/IS0 8502-8:2001P1/un. Use a higher refractive index than the ordinary Bri element (5,5) difficult to determine. For example; with a refractive index that has a function of showing alcohol and another agent that greatly reduces the moisture (water) content of the wood on the wood surface compared with the agent in 6.2, the density of the lower air (water) can be determined:
9 Test report
The test results must include the following:
a) This part number (GB/T28570.8200%) b) Test surface I;
) The composition
The volume of the agent in the cavity of the adhesive tape
The readings in 6.3 and 5.5:
The moisture (water) density of the surface determined by formula (4) in the first article: g)
Test period,2001P1/un. Use a higher refractive index than the ordinary Bri element (5,5) difficult to determine. For example; compared with the refractive index of alcohol and another agent that greatly reduces the moisture (water) content of the wood, the density of the lower air (water) can be determined:
9 Test report
The test results must include the following:
a) This part number (GB/T28570.8200%) b) Test surface I;
) The composition
The volume of the agent in the cavity of the adhesive tape
The readings in 6.3 and 5.5:
The moisture (water) density of the surface determined by formula (4) in the first article: g)
Test period,2001P1/un. Use a higher refractive index than the ordinary Bri element (5,5) difficult to determine. For example; compared with the refractive index of alcohol and another agent that greatly reduces the moisture (water) content of the wood, the density of the lower air (water) can be determined:
9 Test report
The test results must include the following:
a) This part number (GB/T28570.8200%) b) Test surface I;
) The composition
The volume of the agent in the cavity of the adhesive tape
The readings in 6.3 and 5.5:
The moisture (water) density of the surface determined by formula (4) in the first article: g)
Test period,
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