Salt Spray(Fog)Cabinets

Salt Spray(Fog)Cabinets



        The salt spray test is a standardized test method used to check corrosion resistance of coated samples. Coatings provide corrosion resistance to metallic parts made of steelzamak or brass. Since coatings can provide a high corrosion resistance through the intended life of the part inuse, it is necessary to check corrosion resistance by other means. Salt spraytest is an accelerated corrosion test that produces a corrosive attack to the coated samples in order to predict its suitability in use as a protective finish. The appearance of corrosion products (oxides) is evaluated after a period of time. Test duration depends on the corrosion resistance of the coating; the more corrosion resistant the coating is, the longer the period intesting without showing signs of corrosion.

        Salt spray testing is popular because it is cheap, quick, well standardized and reasonably repeatable. There is, however, only a weak correlation between the duration in salt spray test and the expected life of a coating (especially on hot dip galvanized steel where drying cycles are important for durability), since corrosion is a very complicated process and can be influenced by many external factors. Nevertheless, salt spray test iswidely used in the industrial sector for the evaluation of corrosion resistance of finished surfaces or parts.

        The apparatus for testing consists of a closed testing chamber, where a salted solution (mainly, a solution of 5% sodiumchloride) is atomized by means of a nozzle. This produces acorrosive environment of dense saline fog in the chamber so that parts exposedin it are subjected to severely corrosive conditions.

        Tests performed with a standardized 5% solution of NaCL are known as NSS(neutral salt spray). Results are represented generally as testing hours in NSS without appearance of corrosion products (e.g. 720 h in NSS according to ISO9227). Other solutions are acetic acid (ASStest) and acetic acid with copperchloride (CASS test), each one chosen for the evaluation ofdecorative coatings, such as electroplated copper-nickel-chromium, electroplatedcopper-nickel or anodized aluminium.

        Some sources do not recommend to use ASS or CASS test cabinets interchangeably for NSS tests, as it is claimed that a thorough cleaning of the cabinet after ASS or CASS test is very difficult. ASTM does not address this issue, but ISO 9227 does not recommend it and if it is to be done, advocates athorough cleaning.

      Biuged offers various Salt Spray Cabinets from 150L capacity to customized cabinets according to different requirements. All of cainets not only can run NSS test but also CASS or ASS test 



1.0 Structure Feature

Chamber Structure

  Cabinets are made of imported 1.5mm PVC ploy plateNanya, Taiwan, max. durable temperature is 85

  Cabinet sealing cover is made of European 6mm acrylic sheets

  Salt solution reservoir equipped with water level is designe in the chamber,easy to clean

  Humidifying tower is made of SUS 304#, endurable high pressure and good thermal insulation effect.

  Specimen supports designed specially ensure a adjustable position angle for each specimen in order to get a uniform fog and a big specimen capacity.

  Use water to seal working room, ensure the corrosion fog not to leak.

  Electric system is separated from water system, avoid water to enter electric control box to damage accessories

  There is a hole used to drain off fog at the back and bottom of chamber, its damater is 48mm, just used other pipe to connect this hole to drain off the fog from the working room

Chamber Sealing Cover

 V shape , the top ange is 100º, prevent condensate water during the test from dropping to specimen surface and affect testing results.

Atomizing Tower

 In order to ensure the working room to get uniform fog while spraying, this chamber use a special structure glass nozzle to atomize salt solution absolutely, then fog enter a subuliform tower installed in the working room and spray to all working room uniformly.  The installation height of atomizing tower can be adjusted to control spray fog amount precisely.   

Fog Collector

 Fog collectors are tapered funnels whose diameter are 100mm and installed in the working room.At the bottom of the funnel, there is a silicone pipe which connect with graduated cylinder installed outside. These graduated cylinders are used to monitor spray fog amount

Heating System

 For working room, heating tube is made of titanium alloy, water vapour heat the working room under the control of P.I.D

Salt Solution Supply

 The salt solution prepared well is stored in salt solution reservoir, and flow into supplying container under the water level difference. This supplying container is equipped with an automatic water leveling device which can control automatically the max. water level to keep a certain distance with spray nozzels.

Humidifying Tower

 Is made of SUS304# stainless steel, and its temperature can be set from RT-63 and heating up time≤60 min, can add water automatically.Water level is monitored and system would alarm once exceed set level value.


 Armoured titanium alloyelectric heating tubeat the bottom of working room

 Armoured SUS316# electirc heating tubeHumidifying tower

 Heating controlling methodSSR

2.0 Fog Spray System

Spray Fog Principle

 Use Bernouilli’s principle to absorb salt solution then atomize it
 Air Compressor→Oil-water Separatorfirst→Air Storage Tank→Relief Valve→Total Solenoid Valve→Oil-water Separatorsecond→Saturator→Pressure Regulating Valve→Solenoid Valve for spraying→Spray Nozzle

Spray Nozzle

 made of special glass, can control fog amount and spraying angle

Spray Pressure

 Spray pressure can be adjusted from 0.07MPa to 0.17 MPa, in order to make sure the spray pressure generated from spray nozzle be within the range of standard requirments,  it is divided into two steps, adjust air pressure to 0.2MPa to 0.3 MPa as the first step, then adjust to 0.07MPa to 0.17 MPa under the second step

Drain away Fog

 Can drain away fog by manual or set a program to do it. Feed fresh compressed air to working room then drain away the fog of the working room quickly

3.0 Electronic Control System


 E5CC digital display temperature controller imported from Omron, Japan. control working room and humidifying tower temperature

Working Method

 Worked at fixed value, starting and stopping is timed

Setting Method

 English menu, input data by key

Display Resolution



 Digital display , can set second, minute, 10 minutes, hour, 10 hours , 9,999 hours, 1 second

Programme Controller

 Digital display , spray time and interval time can be set freely, infinite cycle. Timing unit: second, minute, 10 minutes, hour, 10 hoursswitch freely 9,999 hours, 1 second.

4.0 Safety Protection Device


 Over temperature protection,  water leakage protection

Humidifying Tower

 Over temperature protection,  water leakage protection

Heating System

 Anti-dry safety protection: all heaters of the cabinet are fitted with a temperature limit protection, which can effectively solve the problem of overheating , heating tube dried , abnormal water supply, short circuit and overload etc.

Water Supply

 Water level protector for working room, low water level protector for humidifying tower


 Earth leakage protection, overload and short-circuit protection


ISO 4611Plastics—Determination of the effects of exposure to dampheat, water spray and salt mist

ISO 7253 Paints and varnishes -- Determination of resistance to neutral salt spray(fog)

ISO 9227Corrosion tests in artificial atmospheres -- Salt spraytests

ASTM B 117Standard Practice for Operating Salt Spray (Fog)Apparatus

ASTM B368Standard Test Method for Copper-Accelerated AceticAcid-Salt Spray (Fog) Testing (CASS Test)

ASTM B 380Standard Test Method for Corrosion Testing of DecorativeElectrodeposited Coatings by the Corrodkote Procedure

ASTM G85 - 11Standard Practice for Modified SaltSpray (Fog) Testing

ASTM D 1735 Standard Practice for Testing Water Resistance of Coatings Using Water FogApparatus

DIN 50021Salt Spray Testing


Main Technical Parameters

WorkingRoom Temperature RangeRT50

HumidifyingTower Temperature RangeRT63

TemperatureUniformity≤ ±2   No-load

Temperature Stablility≤±0.5   No-load

TemperatureDevitation of Working Room±1.0

Temperature IncreasingRateRT55 less than 60 minutesworking room);RT63 less than 60 minutessaturated barrel


Ordering Information
Technical Parameters

BGD 880/S

BGD 881/S

BGD 882/S

BGD 883/S

Working Room SizeW×H×D),mm





Working Room Capacityno including V shape cover

108 L

270 L

480 L

800 L

Overall SizeW×H×D),mm





Qua. of V Shape sample holder/pole





Tank capacity for Salt Solution










Max. Sample Capacity15cm×7cm





Method of Opening Cover





Total Power

2.2 KW

2.2 KW 

3.8 KW  

3.8 KW

Salt Solution Consumption

15 L/d

15 L/d

25 L/d

25 L/d

Water for heating Consumption

30 L/d

30 L/d

40 L/d

40 L/d

Compressed Air Consumption





Power Supply





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