Salt spray testing machine
Release time：2022-07-01 16:34:32 Number of hits：366
Timing system
The high-precision multi-function timer is adopted, and the test time can be set to be multi-functional, with 0.001s-999.9h With power failure memory function, continue to work according to the time before power failure after power failure until the required time for product completion, so as to avoid redoing the experiment after power failure.
Water replenishment system
Automatic / manual water filling system is adopted, with automatic / manual water filling function when the water level is insufficient. The experiment is uninterrupted and meets the diversified environmental requirements of guests. (automatic water replenishment only needs to be connected to the tap water pipe)
Heating mode
In the salt spray experiment, the method of direct steam heating is adopted, which has the advantages of fast heating speed, uniform temperature distribution and short standby time.
control mode
Five key standard operation With automatic fault detection function. The light can be on when the fault occurs The five button operation is simple and easy to understand, and the operation is convenient. Its functions are power switch, operation switch, spray switch, timing switch, and demist switch. Turn on the power switch during the experiment, and the instrument will automatically add water. After adding water, turn on the operation switch Set the experimental temperature, the instrument will automatically heat up, turn on the spray switch, the instrument will start spray, turn on the timer, set the time, and end after the completion of the experimental time Built in manual demist function The product can be placed or viewed during the experiment to remove the salt mist accumulated in the experiment.
Safety protection device
1. With double overtemperature protection, the heating power can be automatically cut off in case of temperature control meter failure or heating system failure. Avoid damaging the instrument due to high temperature.
2. Double low water limit protection to prevent the instrument from being damaged by dry burning of the heating pipe due to lack of water in the laboratory and pressure barrel.
3. With overload and short-circuit protection. Prevent damage to the instrument and its internal electronic control accessories in case of abnormalities In case of any low water level, the machine alarm will be turned on and there will be audible and visual alarm prompt! So that you can find it in time when you are not next to the machine!
Metering cylinder
Two built-in fog collecting cylinders with humanized design are adopted to avoid accidental damage of operators and aisle trucks. Reduce unnecessary trouble. Experiments are more professional
injector
Precision special (patented product) glass nozzle Ensure no crystallization and blockage after 100000 hours of use No wear Corrosion resistance Lifelong replacement The spray tower is equipped with a conical disperser, which has the functions of guiding fog, adjusting the size of spray, and evenly falling fog The comprehensive compatibility of patented nozzle and conical disperser can be used, and the size of spray can be adjusted at will It can be used for accelerated test
Sealing mode
The inner and outer boxes are connected with sealing grooves and sealed with water Prevent the leakage of fog
Control panel and electrical accessories
Thermostat (intelligent) two pressure gauges (Taiwan), one indicator light (Taiwan), six timers (Omron), one time integrator (Taiwan), one control switch (Taiwan), five SSRs (Taiwan Yangming), two relays (Japan Omron), three temperature sensing lines (Taiwan Shenjie), two pressure regulating valves (AIRTAC), two solenoid valves (AIRTAC), four water level indicators (Taiwan Xiangyang), four heating tubes (titanium tubes) Two egos, one
Attachment description
Four V-shaped supports (hy-60 type) eight O-shaped support rods (60 type) two bottles of sodium chloride, one 5000ML measuring cup, one 50ml measuring cylinder (60 type)
temperature range
1: Laboratory temperature: 35 ℃ - 50 ℃ (can be set arbitrarily) (NSS test 35 ℃ / Cass test 50 ℃)
2: Pressure barrel temperature: 47 ℃ - 63 ℃ (can be set arbitrarily) (NSS test 47 ℃ / Cass test 63 ℃)
heating rate
1: Laboratory, normal temperature - → 35 ℃, about 35 minutes
2: Pressure barrel, normal temperature - → 47 ℃, about 15 minutes
Temperature accuracy: ± 1 ℃
This machine is suitable for neutral salt spray test (NSS) and corrosion test (AASs, CASS).
Applicable standards: cns3627, 3885, 4159, 7669, 8886, JIS d-0201, h-8502, h-8610, k-5400, z-2371, ISO 3768, 3769, 3770, ASTM b-117, b-268, gb-t2423, GJB 150
Function: salt water spray tester is suitable for surface treatment of various materials, including coating, electroplating, organic and inorganic film, anodic treatment, antirust oil and other anti-corrosion treatment, and then test the corrosion resistance of its products.
Laboratory capacity 108L 270L 600L 800L
Brine tank capacity 15L 25L 40L 40L
Add 0.26g copper chloride (CuCl2 2H2O) per liter to 5% sodium chloride solution or 5% sodium chloride solution
Compressed air pressure 1.00 ± 0.01kgf/cm2
Spray volume 1.0~2.0ml/80cm2/h
The relative temperature of the laboratory is more than 85%
Spray mode continuous spray programmable spray (including continuous spray and intermittent spray)
Power supply ac220v1 φ 10A AC220V1 φ 15A AC220V1 φ 30A AC220V1 φ 30A
Salt spray, damp heat, drying and impregnation test boxes can be customized according to customer requirements, and the price is negotiable
Salt spray, damp heat, drying test chamber
Carbon dioxide and salt spray test chamber
Operating procedures for salt spray testing machine
1. Please first connect the power supply of the test box and the air compressor, and connect the air compressor air pipe.
2. Add pure water or distilled water into the water inlet in the box and behind the box until the low water level light on the panel is off, otherwise it cannot operate normally.
3. The connection of drainage pipe and exhaust pipe is completed, as shown in the previous page, and the indicator is on to the left.
4. Add water to the isolated water tank to the position of the base plate to avoid salt mist leakage.
5. Preparation method of test solution:
A. Covering, neutral salt spray test (NSS test)
a. The salt solution is prepared with sodium chloride (chemically pure, analytically pure) and distilled or deionized water, and its concentration is (5% ± 0.1)% (mass percentage). The collected liquid after atomization shall not be reused except for the retaining part of the baffle;
b. The pH value of the salt solution before atomization is between 6.5 and 7.2 (35 ± 2 ℃). When preparing salt solution, chemically pure dilute hydrochloric acid or sodium hydroxide solution can be used to adjust the pH value, but the concentration should still meet the requirements of point a.
B. Metal coating, copper accelerated acetic acid salt spray test (CASS test)
a. Dissolve sodium chloride in distilled or deionized water with a concentration of 50 ± 5g / L.
b. Add copper chloride (CuCl2 · 2H2O) to solution a, and its concentration is 0.26 ± 0.02g/l (i.e. 0.205 ± 0.015g/l anhydrous copper chloride).
c. Add an appropriate amount of glacial acetic acid to solution a to ensure that the pH value of the salt spray collection solution in the test chamber is 3.1 ~ 3.3. If the pH value of the solution before spray is 3.0 ~ 3.1, the pH value of the collected solution is generally in the range of 3.1 ~ 3.3. Use the pH meter to measure the pH value of the solution, or use the precise pH test paper calibrated by the pH meter that can read out the change of 0.1ph value as daily detection. The pH value of the solution can be adjusted with glacial acetic acid or sodium hydroxide.
d. To avoid nozzle blockage, the solution must be filtered before use.
Note: for metal coating, acetic acid salt spray test (ASS test) omits step "B" in the process of "B".
6. Pour the salt water into the salt solution replenishment bottle, that is, automatically fill the salt water into the spray tower in the laboratory, so that the liquid medicine flows to the salt water spray tower.
7. Add water to the wet bulb cup, the wet bulb thermometer is covered with gauze, and the end of the gauze is placed in the wet bulb cup.
8. Place the test piece or sample on the shelf: the setting angle is set according to the required standards, such as standard test piece 130 × 70 (mm) can be tilted at 15 degrees and 30 degrees.
9. Set the test temperature: set it according to the required standard (press "▲" to increase, press "▼" to decrease)
a. NSS and AASs tests: the laboratory temperature is 35 ℃; The temperature of saturated air barrel is 37 ℃ (35 ℃ ~ 40 ℃).
b. Cass test: laboratory temperature 50 ℃; The temperature of saturated air barrel is 55 ℃ (50 ℃ ~ 55 ℃).
10. Set the test time: 0 ~ 999hr (H: H; press "+" to increase; press "－" to decrease)
11. Press the power supply and operate the key to pre warm up to the set temperature. Note: cover the test cover and handle it carefully to avoid damage.
12. Press the spray button:
a. Open the air outlet valve in front of the air compressor and adjust the pressure to 0.2 ~ 0.4MPa primary pressure;
b. Adjust the pressure regulating valve to the pressure of 0.07 ~ 0.17mpa, and its pressure can be known by the pressure gauge (increase clockwise and decrease counterclockwise).
13. Press the timing button to count the time according to the set time.
14. After the test, turn off the switches in sequence.
15. If there is any abnormality during the test, please refer to the function abnormality judgment table for treatment.
Operating precautions
This test chamber must not be used for testing the following objects or containing them:
1. Explosives:
1.1 nitroglycerin (ethylene glycol dinitrate), nitroglycerin (propylene glycol trinitrate), nitrocellulose and other explosive nitrates.
1.2 trinitrobenzene, trinitrotoluene, trinitrophenol (picric acid) and other explosive nitro compounds.
1.3 peracetic acid, methyl ethyl ketone peroxide, benzoyl peroxide and other organic peroxides.
2. Combustibles:
Metals: "lithium", "potassium", "sodium", yellow phosphorus, phosphorus sulfide, red phosphorus.
Celluloid: calcium carbide (calcium carbide), phosphorized lime, magnesium powder, aluminum powder, sodium bisulfite.
3. Inflammables:
(1) Ether, gasoline, propylene oxide, carbon disulfide and other substances whose ignition point is less than -30 ℃.
(2) Ordinary ethane, alkene oxide, acetone, benzene, methyl ethyl ketone and other substances with a ignition point of more than -30 ℃ but less than 0 ℃.
(3) Methanol, ethanol, xylene, amyl acetate and other substances with ignition point above 0 ℃ and less than 30 ℃.
(4) Kerosene, light oil, turpentine, isoamyl alcohol, acetic acid and other substances with a ignition point above 30 ℃ and below 65 ℃.
4. Combustible gas:
Hydrogen, acetylene, ethylene, methane, ethane, propane, butane and other gases that may burn at 1 ATM at 15 ℃.
Salt spray test standard and determination of test results
A standard is a unified regulation of repetitive things and summaries.
The salt spray test standard is for the salt spray test conditions,
Such as specific provisions on temperature, humidity, concentration and pH value of sodium chloride solution,
In addition, the technical requirements for the performance of the salt spray test chamber are put forward.
The salt spray test standard for the same product should be selected according to the characteristics of salt spray test, the corrosion rate of metal and the sensitivity to salt spray.
Salt spray test standard
For example, gb/t2423.17-1993 basic environmental test procedures for electrical and electronic products, Test Ka: salt spray test method,
Gb/t2423.18-2000 environmental tests for electric and electronic products Part 2: Tests Test Kb: salt spray, alternating (sodium chloride solution),
Gb5938-86 "test method for corrosion resistance of metal coatings and chemical treatment coatings of light industrial products",
Gb/t1771-91 "paints and varnishes - Determination of resistance to neutral salt spray".
The purpose of salt spray test is to assess the salt spray corrosion resistance quality of products or metal materials, and the judgment of salt spray test results is the judgment of product quality. Whether its judgment results are correct and reasonable is the key to correctly measure the salt spray corrosion resistance quality of products or metals.
The judgment methods of salt spray test results include rating judgment method, weighing judgment method, corrosion occurrence judgment method and corrosion data statistical analysis method.
The rating method is to divide the percentage of the ratio of corrosion area to total area into several levels according to a certain method, and take a certain level as the basis for qualification determination. It is suitable for the evaluation of flat plate samples;
Weighing judgment method is a method of weighing the weight of samples before and after corrosion test, and calculating the weight of corrosion loss to judge the corrosion resistance quality of samples. It is especially suitable for evaluating the corrosion resistance quality of a certain metal;
The method of determining the presence of corrosives is a qualitative method, which judges the samples based on whether the products have corrosion after the salt spray corrosion test. This method is mostly used in general product standards;
The statistical analysis method of corrosion data provides a method for designing corrosion tests, analyzing corrosion data, and determining the confidence of corrosion data. It is mainly used for analyzing and counting corrosion conditions, rather than specifically for the quality judgment of a specific product.
Salt spray test method
Neutral salt spray test (n SS)
Acetate mist (AA SS)
And copper accelerated acetate mist (CA SS, also known as copper chloride acetate mist)
There are three kinds of tests, of which the neutral salt spray test is the most widely used.
The basic content of salt spray test is to spray 5% sodium chloride aqueous solution in the test chamber at 35 ℃ to simulate the accelerated corrosion method of seawater environment. The length of its resistance time determines the quality of corrosion resistance.
The volume of the salt spray box shall not be less than 012 m3, preferably not less than 014 m3, the temperature in the box shall be 35 ℃± 2 ℃, the spray pressure shall be 70 ~ 170kpa, there shall be at least two salt spray collectors, and the collection area shall be 80 cm2 each The tested surface is 15 ~ 30 ° from the vertical direction, so that the salt fog can freely settle on the tested surface. It cannot be sprayed directly. The test support is made of glass and plastic, and the test pieces cannot touch each other and drip each other; The temperature in the box is 35 ℃± 2 ℃, and each collector collects the solution
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