The most common test for steel based materials is the Neutral Salt Spray test often abbreviated to NSS which reflects the fact that this type of test solution is prepared to a neutral pH of 6. Results are represented generally as testing hours in NSS without appearance of corrosion products e. Synthetic seawater solutions are also commonly specified by some companies and standards.
Other test solutions have other chemicals added including acetic acid often abbreviated to ASS and acetic acid with copper chloride often abbreviated to CASS each one chosen for the evaluation of decorative coatings, such as electroplated copper-nickel-chromium, electroplated copper-nickel or anodized aluminum.
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These acidified test solutions generally have a pH of 3. ASTM does not address this issue, but ISO does not recommend it and if it is to be done, advocates a thorough cleaning. Although the majority of salt spray tests are continuous, i. Such tests are commonly referred to as modified salt spray tests. ASTM G85 is an example of a test standard which contains several modified salt spray tests which are variations to the basic salt spray test. ASTM G85 is the most popular global test standard covering modified salt spray tests. This acceleration arises through the use of chemically altered salt spray solutions, often combined with other test climates and in most cases, the relatively rapid cycling of these test climates over time.
Although popular in certain industries, modified salt spray testing has in many cases been superseded by Cyclic corrosion testing CCT The type of environmental test chambers used for modified salt spray testing to ASTM G85 are generally similar to the chambers used for testing to ASTM B , but will often have some additional features, such as an automatic climate cycling control system. ASTM G85 annex A1 — Acetic Acid Salt Spray Test non-cyclic This test can be used to determine the relative resistance to corrosion of decorative chromium plating on steel and zinc based die casting when exposed to an acetic acid salt spray climate at an elevated temperature.
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This test is also referred to as an ASS test. Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of salt water solution, prepared in accordance with the requirements of the test standard and acidified to pH 3. This spray is set to fall-out on to the specimens at a rate of 1. This climate is maintained under constant steady state conditions. The test duration is variable. This test can be used to test the relative resistance to corrosion of aluminium alloys when exposed to a changing climate of acetic acid salt spray, followed by air drying, followed by high humidity, all at an elevated temperature.
Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 3 part repeating cycle. This is followed by 2. This is followed by 3. The number of cycle repeats and therefore the test duration is variable. This test can be used to test the relative resistance to corrosion of coated or uncoated aluminium alloys and other metals, when exposed to a changing climate of acidified synthetic seawater spray, followed by a high humidity, both at an elevated temperature.
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Not you? Sign Out. Customer Lookup. Your account. Sign in or Register. The number of cycle repeats and therefore the test duration is variable.
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This test can be used to test the relative resistance to corrosion of coated or uncoated aluminium alloys and other metals, when exposed to a changing climate of acidified synthetic seawater spray, followed by a high humidity, both at an elevated temperature. Test specimens are placed in an enclosed chamber, and exposed to a changing climate that comprises the following 2 part repeating cycle.
Test specimens are placed in an enclosed chamber, and exposed to 1 of 2 possible changing climate cycles. In either case, the exposure to salt spray may be salt water spray or synthetic sea water prepared in accordance with the requirements of the test standard.
The most appropriate test cycle and spray solutions are to be agreed between parties. The first climate cycle comprises a continuous indirect spray of neutral pH 6. The second climate cycle comprises 0. This is followed by 0. This test can be used to test the relative resistance to corrosion paints on steel , when exposed to a changing climate of dilute salt spray at ambient temperature, followed by air drying at and elevated temperature. This is followed by 1.
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These standards describe the necessary information to carry out this test; testing parameters such as temperature, air pressure of the sprayed solution, preparation of the spraying solution, concentration, pH , etc. Daily checking of testing parameters is necessary to show compliance with the standards, so records shall be maintained accordingly. Testing cabinets are manufactured according to the specified requirements here. However, these testing standards neither provide information of testing periods for the coatings to be evaluated, nor the appearance of corrosion products in form of salts.
Requirements are agreed between customer and manufacturer. In the automotive industry requirements are specified under material specifications.
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Different coatings have different behavior in salt spray test and consequently, test duration will differ from one type of coating to another. For example, a typical electroplated zinc and yellow passivated steel part lasts 96 hours in salt spray test without white rust. Electroplated zinc-nickel steel parts can last more than hours in NSS test without red rust or 48 hours in CASS test without red rust Requirements are established in test duration hours and coatings shall comply with minimum testing periods.
Hot-dip galvanizing produces zinc carbonates when exposed to a natural environment, thus protecting the coating metal and reducing the corrosion rate. The zinc carbonates are not produced when a hot-dip galvanized specimen is exposed to a salt spray fog, therefore this testing method does not give an accurate measurement of corrosion protection.
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ISO gives the guidelines for proper measurement of corrosion resistance for hot-dip galvanized specimens. Painted surfaces with an underlying hot-dip galvanized coating can be tested according to this method.