How to passes 24 hour corrosion Non-toxic of metal tag logo-A
Whether an ‘Metal Logo’ passes the 24-hour corrosion test non-toxic ，is usually assessed by a combination of chemical immersion testing, salt spray testing, electrochemical testing and toxicity testing, as described below:
First.24 hour corrosion Non-toxic-corrosion test
1.Chemical Immersion Test
Method
The engraved circular metal marking is made into a test piece and immersed in a specific corrosive medium (such as acid, alkali, salt solution) for 24 hours.
Assessment
Evaluate the degree of corrosion of the metal tag logo by weighing, apparent inspection (Fox example number, size and depth of corrosion spots), and measuring the depth of etching holes.
Criteria
The lighter the degree of corrosion, the better the corrosion resistance.
2.24 hour corrosion Non-toxic-salt spray test of metal tag logo
Method
In a salt spray box, spray saturated brine solution in mist on the surface of the metal tag logo, simulating marine or high salt environment for 24 hours.
Assessment
Check the degree of corrosion on the surface of the metal logo, such as blistering, rusting and peeling off
Standard
According to ASTM B117 or ISO 9227, the higher the rating, the better the corrosion resistance.
3.Electrochemical test of metal tag logo
Method
Evaluate the corrosion resistance of a metal marking by measuring the change in potential and the change in current under a specific electrochemical environment.
Tools
Polarisation curve measurement or electrochemical impedance spectroscopy using an electrochemical workstation.
Assessment
the corrosion current is smaller and the polarisation resistance will be higher, the corrosion resistance.will be better
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