ZInc plating of wiremesh

[Ratheesh_n]

Dear All,

We are doing zinc plating of wiremesh ,(wire - 4.5mm dia). Anyone please tell how to check the coating thickness of wire ? is measurment with elechometer is acceptable ?

And how to maintain the shining of plating in packing and storage

 

[dik]

CocoE:

I generally spec, "HDG EXPOSED TO THE ELEMENTS SHALL BE PASSIVATED USING A NON-CHROMATE PROCESS", because of health related issues with Chromate treatment. Passivating the HDG material will not likely resolve the coating issue. It's likely related to the actual 'dipping'.

Dik

 

[CoCoE]

Dear Dik,

Could you please read my reply once again?

I am not saying to do chromate treatment to solve the galvanizing defects. My suggestion is to do it on "electroplated" wires, and I hop I am not diverted from the initiator's question. HDG is always best solution than electroplating due to many reasons (no alloy layer, less thickness, less Zn density), I was just trying to help him out to make his product better.

Also, for your information, all chromates are not having health issues, and if you can go through ASTM or ISO electroplating standards you may find it right there.

CocoE

 

[dik]

I did... but, would not passivate electrogalvanised material. Only use for this coating is interior non=corrosive environment, IMHO.

Dik

 

[CoCoE]

Dear Dik,

Yeah mostly only non corrosive environment due to the factors I stated above, but I have seen electroplated "items" are used even on the exposed (I am not saying it really corrosive) locations where HDG may cause undesirable changes like clogs, lumps or uneven build. Electroplating or mechanical galvanizing (small components) are often used in such occasions where a good surface finish is desirable.

What do you say on that?

CocoE

 

[dik]

If the environment is non-corrosive, sure, use electroplating... zinc, chrome, or whatever..

If finish and tolerance is essential, and it is a corrosive environment, then construct it out of material that is non-reactive.

I specifically stipulate that cadmium is not used.

Dik