GM9540P Accelerated Corrosion Test

The GM9540P test standard describes an accelerated laboratory corrosion test method for evaluating components and components. The test procedure provides a combination of cycling conditions (salt solution, various temperatures, humidity and environmental ) to accelerate metal corrosion. This method can effectively evaluate various corrosion mechanisms, such as ordinary corrosion, electric corrosion, crevice corrosion, etc. The test duration can be individually customized to achieve any desired level of corrosion exposure. Furthermore, due to temperature, the synergistic effect of mechanical and electrical cycles can be understood by this test.

Test equipment:

The technical specifications of the GM9540P accelerated corrosion test chamber: shall comply with the following test standards:

TABLE 3 -TEST  PARAMETERS
Test Equipment	Test Method
Fog Humidity Cabinet Temperature	GM4465P   @49 ±2℃
Salt Solution Sodium Chloride,% Calcium Chloride,% NaHCO,Concentration,% Salt Solution pH	0.9** 0.1 0.25 6-9
Dryoff Environment Temperature Humidity	60±2℃ <30%RH
Ambient Temperature Ambient Humidity	25±2℃ 40-50%RH

The spray solution (CaCl2 or NaHCO3) material must be dissolved separately in water and added to other material solutions. If all dry solid materials are added, an insoluble precipitate may be created.

Test material

Corrosion specimen, made of AISI 1006-1010 steel bar of 25.4mm (width) x 50.8mm (length).

Test procedures

1. Specimen/test sample preparation:

Each specimen should be stamped with a permanent identifier on the surface, corroded specimens can be cleaned with methanol or acetone solution, and accurately weighed before use. The weight (mg) should be recorded and retained for reference. Note: It is very important to remove slip-form oil or anti-corrosion oil/lubricating oil before exposure to allow uniform corrosion of the specimen. Before cleaning with methanol or acetone in this process, commercially available degreasing agent can be used to assist cleaning.

2 Preparation of test frame:

Before starting the test, prepare a test frame that can accommodate enough specimens to monitor the test. The specimens should be fixed to the aluminum or non-metal test frame with a fixator. The minimum interval between the specimen and the surface of the test frame is 5mm. All specimens shall be fixed in the vertical direction of 15" and shall not touch each other.


3.Test method

The test method steps are shown in Table 2. The cycle is repeated every day as needed until the test duration requirements are met. When the test request is selected, the test can be continued on weekends to reduce the entire test time. For each salt spray, use a sprayer to mist the sample and test piece until everything is completely damp. Spray occurs when the sample and test piece are in the surrounding environment. As long as the part dries significantly, the salt spray time in Table 2 can vary by ±30 minutes before each spray.

Time*	Event
6:00 am 7:30 am 9:00 am 10:30 am 2:00 pm 10:00 pm Weekends	Salt mist application(in ambient env) Salt mist application (in ambient env) Salt mist application (in ambient env) Salt mist application (in ambient env) 8 h humidity cabinet exposure including 1 h ramp to wet conditions 8 h dry environmental exposure including 3 h ramp to dry conditions Ambient environment

Why choose JOEO for salt spray corrosion testing

The JOEO Salt Spray Cycle corrosion chamber is one of the most advanced and versatile corrosion test systems in the world, combining salt spray with other environmental conditions such as controlled humidity, drying and wetting. Suitable for testing popular salt spray standards including: ASTM B117, ISO 9002, JIS Z 2371 and ASTM G85. Other standards that require humidity control include ASTM G44, CCT-1, CCT-2, CCT-3, ECC-1, GM9540P, GMW14872, ISO11997, and SAE J 2334.
If you have any questions about cyclic corrosion testing, we invite you to contact us immediately. We are happy to help you meet your custom cyclic corrosion testing requirements