Cheap 4" PU Medical Bed Mute Swivel Double Caster Wheel With Total Lock Brake KT-PH60-100

Method and operation of salt spray test for caster hardware
Salt spray test is an environmental test that mainly uses the artificial simulated salt spray

environmental conditions created by salt spray test equipment to evaluate the corrosion resistance

of products or metal materials. Today, I'd like to talk about the method of salt spray test.

1, Test preparation
The equipment needed to test casters is spray nozzle, salt bucket, test piece support rack, spray liquid

collection container, laboratory.

(the size of the laboratory shall be more than 0.48m3), brine supply drum, pressure drum, compressed

air supply equipment and exhaust equipment, and the test shall be carried out according to the

following conditions.

(1) the salt spray testing machine and its required pipeline should be made of pure material, which

can not affect the spray corrosion test or corrode itself.

(2) spray nozzle should not directly spray the test solution to the sample, and the solution gathered

at the top of the spray chamber should not drop on the sample.

(3) The test liquid dripping from the sample shall not flow back to the salt water bucket and be

reused for the test;

(4) Compressed air can not contain grease and dust, so there must be an air purifier; The air

pressure must be kept at 1 + 0.1kgf/cm2. Because the compressed air is endothermic when

expanding, it must be pre heated (preheated to increase the temperature and humidity of

compressed air) to obtain uniform temperature spray.

2, Test solution
1. The test solution is prepared with sodium chloride (chemically pure and analytically pure) and

distilled water or deionized water, and its concentration is (5 ± 0.1%) (mass percentage). The

atomized collected solution shall not be reused except the baffle return part;
Remarks: in order to prepare a salt solution with a concentration of 5%, the mass of sodium chloride

required can be calculated by the following formula; Required sodium chloride mass = caster mass

of 0.053 water

2. PH value of solution
The pH value of the salt solution before atomization is between 6.5 ~ 7.2 (35 ± 2 ℃);
Remarks: the pH value range is required to be measured at Ta = 35 ± 2 ℃. When the pH value of

the salt solution is adjusted at room temperature and atomized at 35 ℃, the pH value of the

collected solution will be higher than that of the original solution because CO2 will volatilize and

lose at a higher temperature;
Therefore, when the pH of the salt solution is adjusted at room temperature, it is necessary to adjust

it to below 6.5, so that it will fog at 35 ℃
The pH value of the solution collected after chemical treatment will meet the requirements of 6.5 ~ 7.2;

3. The temperature in the laboratory (referring to the temperature in the box) is 35.2 ℃;

4. Saturation pressure and temperature in the barrel: 47 ± 1 ℃;

5. Saturated barrel pressure 1kgf

6. spray volume
At any position in the working space, use a funnel with an area of 80cm2 to collect the salt spray

settlement of continuous atomization for 16h, and collect 1.0 ~ 2.0ml solution per hour on average;

3, The tested surface of the test piece shall not be directly sprayed by salt spray;

1. The placement angle of the specimen surface in the test chamber is very important. In principle,

the test surface of the flat plate specimen is upward and 20 ° from the vertical direction? 5? Angle of;

For irregular surface specimens, various placing states can be adopted to ensure that each main

surface can receive brine spray at the same time.

2. the arrangement of the test pieces should make the spray free fall to the surface of all the

specimens without impeding the free falling of the spray.

3. The test pieces shall not contact with each other, metal conductors or substances with capillary

effect, or other objects outside the support;

4. Salt solution shall not drip from one test piece to the surface of other test pieces;

5. If the test piece has identification marks and other pastes, it shall be placed under the test piece

as far as possible;

6. For a new test or a test with a total test specimen of more than 96h, the tested sample can be

allowed to shift. In this case, the number and frequency of shifts shall be determined by the operator,

but shall be indicated in the test report;

7. The support of the sample shall be made of inert non-metallic materials, such as glass, plastic or

coated wood products. The material for hanging the specimen shall not be metal, but artificial fiber,

cotton fiber or other inert insulating materials.

4, Initial test of test piece

1. Appearance and structure inspection
The surface of the test sample must be clean without oil stain, damage, temporary protective layer

and other defects;

2. Electrical performance inspection
If the electronic and electrical castor products are tested as a whole, the electrical performance must

be inspected and the test data must be recorded before the test.

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