Cyclic corrosion testing provides the best possible laboratory simulation of natural corrosion. Current research indicates that cyclic corrosion testing results are similar to
outdoors in resulting structure, morphology, and relative corrosion rates. Prior to cyclic testing, conventional salt spray (a continuous salt spray at 35˚C) was the standard way to simulate corrosion in a lab. Because conventional salt spray methods failed to mimic the natural wet/dry cycles of outdoors, test results frequently provided poor correlation to outdoors.
In a Shanghai Linpin cyclic corrosion climate chambers, specimens are exposed to a series of different environments in a repetitive cycle that mimics outdoors. Simple cycles, such as may consist of cycling between salt fog and dry conditions. More sophisticated automotive methods may call for multi-step cycles that incorporate humidity, along with salt spray and dry-off.
Shanghai Linpin environmental test chambers are available in two types. The base model traditional salt spray tests and compound salt spray tests. In addition to this, all Shanghai Linpin environmental test chambers are available in five sizes to fulfill a range of testing requirements.
Shanghai Linpin environmental test chambers are also easy to install, easy to program, and easy to operate. Specimen mounting and evaluations are simplified with a low belt line and easy-opening lid. All models are completely automated and can operate continuously, 24 hours per day, 7 days per week, without supervision. The testers are smart enough to alert you to issues they may encounter during testing.
We believe that just because a product is technical, so it doesn’t have to be hard to understand or difficult to maintain and repair. Instead of complicating our tester designs by loading them with extra or unnecessary features, we put our engineering effort into keeping things simple. Subsystems are modular, easy to troubleshoot and easy to replace. This makes typical maintenance and repair of Shanghai Linpin environmental test chambers simple enough that it doesn’t require a field technician.
Every 1000 hours of operation, the climate chambers need to carry out a routine maintenance. During this routine preventive maintenance, the bubble tower (used to saturate the compressed air for atomizing the salt solution) should be drained and refilled. Air and water filters should be cleaned at this time. It is also recommended to clean and wash down the chamber walls and heater. Once per year, filters and peristaltic pump tubing are replaced, which takes only a few minutes.
Direct access to key maintenance or repair items is possible with a removable side access panel. The layout and position of all components in a Shanghai Linpin environmental test chambers are painstakingly designed to allow easy access for inspection and maintenance.
Numerous accelerated corrosion tests may be performed in the Shanghai Linpin compound salt spray model, including ASTM B117, ASTM G85, BS 3900, F4 & F9, DIN 50.021, ISO 9227, GB/T 10125 and many others. The compound salt spray climate chambers are our the most economical model, and can perform salt fog, dwell and dry-off and humidity functions.
Now Let me introduce the environmental test chambers for AS 2331 Methods of test for metallic and related coatings Method 3.1: Corrosion and related property tests-Neutral salt spray (NSS test) for you.
This Standard sets out the method for the neutral salt spray (NSS) test for the assessment of corrosion resistance of inorganic and organic coatings on metallic substrates. The method does not specify the type of test item, the exposure period or the assessment criteria. Such details are normally specified in the relevant product Standard or determined by agreement between the purchaser and the supplier.
The following apparatus is required:
(A) Spray cabinet:
The spray cabinet shall be made of or lined with, materials resistant to corrosion by the test solution. The cabinet shall have a volume of not less than 0.2 m3 and.preferably not less than 0.4 m3 since, with smaller volumes, difficulties are experienced in ensuring an even distribution of spray.
(B) Test piece supports:
Test piece supports shall be made of inert non-metallic material such as ceramic, glass, plastic, or suitably coated wood.The material used for suspending test pieces shall be synthetic fibre, cotton thread or other inert insulating material.
(C) Atomizing equipment:
The cabinet shall be equipped with means to spray the test solution and shall include
(i) a supply of clean compressed air of controlled pressure and humidity;
(ii) a reservoir to contain the stock of test solution;
(iii)one or more atomizers made of chemically inert material.
The compressed air supply to the atomizers shall pass through a filter to remove all traces of oil and solid matter and shall be at a pressure of 70 kPa to 170 kPa.
(D) Collecting containers:
At least two containers to collect sprayed test solution are required. Such containers shall comprise graduated cylinders, or similar, made of glass or other chemically inert material and shall incorporate the stem of a similarly inert funnel inserted through their stoppers.
(E) Temperature control:
The cabinet shall be fitted with equipment and instruments capable of supplying and controlling heat to maintain the cabinet and its contents at the specified test temperature (see Clause 7.1). The controller shall be a thermostat element placed either within the spray cabinet at least 100 mm from the walls or in a water jacket on the cabinet. In either case a thermometer shall be placed within the cabinet at least 100 mm from the walls and shall be capable of being read from outside the cabinet.
Preparation of test solution:
The neutral salt spray test solution shall be prepared by dissolving sodium chloride in distilled or deionized water to produce a concentration of 50 ±5 g/L.
The pH of the salt solution shall be adjusted to enable the pH of sprayed solution collected within the test cabinet (see Clause 4(d)) to be in the range 6.5 to 7.2.
Procedure: Cabinet operating conditions
The test cabinet shall be operated in accordance with the following conditions using the test solution specified in Clause 5
(a) Test cabinet temperature: 35 ±20℃
(b) pH of collected test solution: 6.5 to 7.2
(c) Average collection rate of sprayed test solution over a minimum period of 24 h for a horizontal collecting area of 80 cm: 1 mL/h to 2 mL/h
(d) Concentration of NaCl in collected test solution: 50±10 g/L
Recommended periods of exposure are 2 h, 6 h, 24 h, 48 h, 72 h, 96 h, 168 h, 240 h, 336 h, 480 h, 720 h or 1000 h.
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