MIL STD 810G Salt Fog Test--Salt Fog Cabinet

MIL-STD 810G Standard 509.5 Tests for accelerated corrosion using salt spray, designed to assess the effectiveness of protective coatings and coatings on materials. All unprotected metals will rust if they do not have surface protection such as coating or paint, and the finish may also have holes or cracks that allow corrosion to reach the underlying material and cause corrosion. The method can also be used to determine the impact of salt deposits on the physical and electrical aspects of equipment.

Application

MIL STD 810G salt fog test 509.5 Test method Screening is performed solely for the purpose of evaluating the effectiveness and quality of protective coatings and finishes on materials and material plates, and to find potential problem areas, quality control deficiencies, design flaws, etc., in a relatively short period of time. This test has been used to point out potential problem areas related to the salt (Marine) environment. In general, it is only applicable if the material will experience significant exposure (not infrequently or irregularly) at high levels of salt in the atmosphere.

The impact of abrasive environment

The salt fog test is performed in accordance with MIL-STD 810 Method 509 to determine the corrosion resistance of the material and the effect of the introduction of a wet salt solution on electrical components. Salt is one of the most corrosive compounds in the world and cannot be avoided. The worst effects of salt spray occurred in coastal areas. The impact of materials on corrosive atmospheric environments can be divided into three categories:

Corrosion effects

• Corrosion due to electrochemical reactions.
• Accelerated stress corrosion.
• Salts in water ionize to form acidic/alkaline solutions.

Electrical effect

• Damage to electrical materials due to salt deposition.
• Production of conductive coatings.
• Corrosion of insulating materials and metals.

Physical effect

• The moving parts of machinery parts and assemblies are blocked or stuck.
• The paint blistered due to electrolysis.

Testing process

• Step 1. Place the test item in the chamber, adjust the chamber temperature to 35°C, and adjust the test item for at least two hours before introducing the salt spray.

• Step 2. Continuously atomize a salt solution of a composition as given in paragraph 4.5.1.1b into the test chamber for a period of 24 hours or as specified in the test plan (see paragraph 2.2.3). During the entire exposure period, measure the salt fog fallout rate and pH of the fallout solution at least at 24-hour intervals4/. Ensure the fallout is between 1 and 3 ml/80cm2/hr.

• Step 3. Dry the test item at standard ambient temperatures and a relative humidity of less than 50 percent for 24 hours, or as otherwise specified (see paragraph 2.2.3). Minimize handling the test item or adjusting any mechanical features during the drying period.

• Step 4. If the 48/48-hrs option has been chosen, proceed to Step 5. Otherwise, at the end of the drying period, repeat steps 1 to 3 at least once.

• Step 5. After completing the physical and any electrical checkouts, document the results with photographs. See paragraph 5 for analysis of results. If necessary to aid in the follow-on corrosion examination, use a gentle wash in running water that is at standard ambient conditions, conduct the corrosion examination, and document the results with photographs.

• Step 6. Visually inspect the test item in accordance with the guidelines given in paragraph 4.5.1.2.

Under normal circumstances, the test sample taken from the salt spray test cannot be used for other tests. If there is only one sample or a sample needs to be reused for other tests, water and mold growth tests should be performed before the salt spray test and sand and dust tests after the salt spray test.
After testing, the physical, electrical and corrosive effects of the substance should be checked. There may be surprising results. We tested the back panel of the nickel-plated sample and compared it with the galvanized sample. Obviously, the more expensive nickel coating has obvious holes in it, and the effect is not good; Zinc coatings, which are much cheaper, show only slight surface corrosion without damaging the underlying metal.

JOEO's salt spray equipment and capabilities

JOEO is a professional manufacturer of salt fog cabinet in Asia, with an internal size range of 110L-12000L. The chamber can carry out salt spray, mist, spray and full load tests as described in the most popular test specifications.
We can also customize oversized salt fog cabinet to accommodate large equipment such as cars, drones, and large machinery. If your large equipment is not suitable for traditional chambers, we will work with you to find solutions to complete the work.
Contact us to find out how we can help you with your salt spray testing needs. Get a quote and be the first to know about our competitive prices, timely processes and reputation for excellence.