1. Application

The apparatus for testing consists of a closed testing chamber, where a salt water solution (usually, a solution of 5% sodium chlorideby weight, dissolved in water) is atomized by means of spray nozzle(s). This produces a corrosive environment of dense saline fog in the chamber so that parts exposed in it are subjected to severely corrosive conditions. Chamber volumes vary from supplier to supplier. If there is a minimum volume required by a particular salt spray test standard, this will be clearly stated and should be complied with. There is a general historical consensus that larger chambers can provide a more homogeneous testing environment.

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 ISO 9227). Other solutions are acetic acid (ASS test) and acetic acid with copper chloride (CASS test), each one chosen for the evaluation of decorative coatings, such as electroplated copper-nickel-chromium, electroplated copper-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 a thorough cleaning.

2. Features:  

2.1 The whole part of the device is made of P.V.C. Sheet and the inside of the device is reinforced by using a special lining material. Hence, it is sturdily made and will not transform forever.
 

2.2 The test chamber is heated from five directions in order to ensure the temperature difference in the chamber may be kept within (± 1).
 

2.3 Spray nozzle: The nozzle is specially made to enable it to suck up the salt water and then spray it out in the shape of mist with considerable high speed. When it falls on the surface of the item being tested, the difference of fallen mist may be controlled within ± 0.3ml / 80 cm2h.
 

2.4 HUNTER PRINCIPLE is used to make the saturated air hot and moist and to keep the humidity in the test chamber required for test.
 

2.5 Temperature is the pre-requisite condition that with have direct impact on corrosion rate. We use P.I.D. temperature control unit to limit the temperature difference within the range of ± 0.5.
 

2.6 A warning device is used to indicate the low level of the test fluid, when the fluid is only enough for being sprayed for five hours, a buzzer will remind the user to replenish the liquid to ensure continuous spray test.
 

2.7Use full automatic detecting system, test stopped automatic, and lighting display when trouble.

3. Additional Features About Salt Water Spray Testing Machine from KOMEG:    

                        
High temperature resistant material imported from Germany to ensure long-term use 
Complete system for water level and water temperature protection to ensure safe use
Nozzle spray pressure, work room temperature and working time adjustable, easy operation
Accurate glass nozzle to assure evenly spread and no crystallization block.