Comparative testing 1

[prelmes]

We would like to change our plating supplier. The components are mild steel and receive a zinc plate and passivate. The potential new supplier uses a different process to the current supplier - although we are assured the parts will have the same level of corrosion protection.

Is there a simple comparative test we can perform in-house on samples coating by the two processes - without the need to go to a thrid party laboratory for a salt fog test?

 

[CoryPad]

How about periodic immersion in 3.5 % NaCl solution with ambient air dry?

 

[tnatale]

If you can provide a good description of how the part will be used, environment, temp, etc, then I can give you a few things to try. Also what do you have available to to assist in the testing, access to ovens, chemicals, labware, etc.

 

[prelmes]

Hi tnatale

The plated metal forms the chassis of an electronic component. The component must comply with MIL-STD 810G method 509.5 (salt fog). We specify a temperature range of -30 to +60 Deg.C.

We have access to the tools and equipment typically found in a mechanical test lab. We have access to ovens, common solvents, etc..

 

[lbell]

For a cheap and simple check if the parts not not too expensive; make a salt solution of water, partly cover the parts in a sealed container and put them in an over at 60 deg C for 48 hours (checking on them every few hours). I would do this with both your current parts and the potential new ones and see how they react/compare.

 

[prelmes]

Thanks for the suggestion Ibell. We have followed your advice.