New Programmable Salt Spray (Fog) Cabinets Supplier and Dealer in India

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 is widely 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% sodium chloride) is atomized by means of a nozzle. This allows the coated samples to be exposed to corrosive conditions.

The salt spray test is standardized according to ASTM B117. Results are expressed in hours of exposure, and in some cases as a percentage of damage. The NSS, or neutral salt spray, generally refers to a test in NSS without appearance of corrosion products (e.g., 720 h in NSS according to ISO 9227). Other terms are also used, such as the acid salt spray (ASS) corrosion test, which can be done where the evaluation criteria are acidic solutions (e.g., 5% acetic acid, electroplated copper-nickel-chromate coating).

Some vendors do not recommend to use ASS or CASS test cabinets interchangeably for NSS tests, as it is claimed that the thorough cleaning of the cabinet after ASS or CASS tests does not address the need for ISO 9227 compliance. This is important if it is to be done, advocates say, for thorough cleaning.

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

Standards

• ISO 4611(Plastics Determination of the effects of exposure to damp heat, water spray and salt mist)
• ISO 7253(Paints and varnishes – Determination of resistance to neutral salt spray (fog))
• ISO 9227(Corrosion tests in artificial atmospheres – Salt spray tests)
• ASTM B 117(Standard Practice for Operating Salt Spray (Fog) Apparatus)
• ASTM B368(Standard Test Method for Copper-Accelerated Acetic Acid-Salt Spray (Fog) Testing (CASS Test))
• ASTM B 380(Standard Test Method for Corrosion Testing of Decorative Electrodeposited Coatings by the Corrodkote Procedure)
• ASTM G85 - 11(Standard Practice for Modified Salt Spray (Fog))
• ASTM D 1735(Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus)
• DIN 50021(Salt Spray Testing)

Features:

1.0 Structure Feature

• Chamber Structure :
  • Cabinets are made of imported 1.5mm PVC ploy plate (Nanya, Taiwan), max. durable temperature is 65 °C
  • Cabinet sealing cover is made of European 6mm acrylic sheets
  • Salt solution reservoir equipped with water level indicator designed in the chamber, easy to clean
  • Humidifying tower is made of SUS304, electrically heated for good thermal effect
  • Specification supports designed especially to ensure a adjustable spacing for each specimen in order to get a uniform fog and a big specimen in order to get a big specimen capacity.
  • Ventilate: A vent to send working room, ensure the corrosion fog not to leak.
  • Electric System: Designed for safety, avoid short circuit and relevant electric control to damage accessories.
  • Drainage: There is a hole used to drain off fog at the back and bottom of the chamber; its diameter is 48mm, just enough to prevent clogging.
• Chamber Sealing Cover :
  • V shape, the top angle is 100° - prevent condensate water during the test from dropping to specimen.
• Atomizing Tower :
  • To ensure the efficacy of working room to get uniform fog, this chamber is designed in structure glass nozzle to atomize salt solution automatically, the fog is distributed uniformly in the working room and prevents water dropping down.
• Fog Collector :
  • Fog collectors are tapered funnels whose diameter are 100mm and installed in the working room. At the outside, it is conical shape, which serves to direct fog to cylindrical vessel outside.
• Heating System :
  • For working room, heating tube is made of titanium alloy, water vapor heats the working room and device.
• Salt Solution Supply :
  • The salt solution prepared well is stored in salt solution reservoir and now fed to supplying container under the control of a water level monitoring device.
• Humidifying Tower :
  • It is made of SUS304 stainless steel and its temperature is set from RT-83°C and heating up the aerated solution and water automatically. Water level is monitored and system would alarm once exceed set.
• Heater :
  • Electrical heating duct (2 at the bottom of working room)
  • Armoured SUS316 electric heating tube (Humidifying tower)
  • Heating controlling method: SSR

2.0 Fog Spray System

• Spray Fog Principle :
  Use Bernoulli’s principle to absorb salt solution then atomize it:
  • Air Compressor → Oil-water Separator (first) → Air Storage Tank → Relief Valve → Total Solenoid Valve → Oil-water Separator (second) → Saturator → Pressure Regulating Valve → Solenoid Valve for spraying.
• Spray Nozzle : Made of special glass, can control fog amount and spraying angle.
• Spray Pressure : Spray pressure can be adjusted from 0.07 MPa to 0.17 MPa. To ensure the spray pressure generated from the spray nozzle is within the range of standard requirements, it is divided into two steps:
  • Adjust air pressure to 0.2 MPa to 0.3 MPa as the first step, then adjust to 0.07 MPa to 0.17 MPa under the second step.
  • Drain away fog by manual or set a program to do it. Feed fresh compressed air to the working room, then drain away the fog of the working room quickly.

3.0 Electronic Control System

• Controller: ESCO digital display temperature controller imported from Omron, Japan, controls 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: 0.1°C temperature.
• Timer: Digital display; can set second, minute, 10 minutes, hour, 10 hours; max is 9,999 hours, min is 1 second.
• Programme Controller: Digital display; spray time and interval time can be set freely, infinite cycle. Timing: until second, minute, 10 minutes, hour, 100 hours (switch freely) max is 9,999 hours, min is 1 second.

4.0 Safety Protection Device

• Cabinet: 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 temperature limit protection, which can effectively solve the problem of overheating; heating tube dried, abnormal water supply.
• Water Supply: Water level protector for working room, low water level protector for humidifying tower.
• Power: Earth-leakage protection, overload and short-circuit protection.

Main Technical Parameters:

• Working Room Temperature Range: Rt – 50°C
• Humidifying Tower Temperature Range: Rt – 63°C
• Temperature Uniformity: ± 2°C (No load)
• Temperature Stability: ≤ 0.5°C (No load)
• Temperature Deviation of Working Room: ± 1.0°C
• Temperature Increasing Rate:
  • Rt – 55°C less than 60 minutes (working room)
  • Rt – 63°C less than 60 minutes (saturated barrel)
• Compressed Air Supply: Customer should prepare an air compressor which can offer clean, waterless, and oil-less compressed air, 0.4 MPa to 0.8 MPa pressure.

Specification	BGD 880/S	BGD 881/S	BGD 882/S	BGD 883/S
Working Room Size (W × H × D), mm	600 × 400 × 450	900 × 500 × 600	1200 × 500 × 800	1600 × 500 × 1000
Working Room Capacity	108 L	270 L	800 L	800 L
V Shape Cover Volume	Appr. 50 L	Appr. 140 L	Appr. 250 L	Appr. 380 L
Overall Size (W × H × D), mm	1150 × 1090 × 672	1550 × 1240 × 900	1980 × 1350 × 1100	2480 × 1450 × 1250
Qty. of V Shape Sample Holder/Pole	4/6	6/12	8/16	10/22
Tank Capacity for Salt Solution	15 L	15 L	30 L	45 L
Collectors	1	2	2	2
Max. Sample Capacity (15 cm × 7 cm)	28 pcs	70 pcs	108 pcs	120 pcs
Method of Opening Cover	Manual	Manual	Pneumatic	Pneumatic
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	30 L/d
Water for Heating Consumption	30 L/d	40 L/d	40 L/d	40 L/d
Compressed Air Consumption	1 m³/h	1 m³/h	2 m³/h	2 m³/h
Power Supply	220V; 50/60HZ	220V; 50/60HZ	220V; 50/60HZ	220V; 50/60HZ