Would zinc coated 4043 steel with 17-4 SS produce corrosion?

Question

Would zinc coated 4043 steel with 17-4 SS produce corrosion?

mexmech (Mechanical)

(OP)

29 Aug 03 15:38

Hi,

If I make a “sandwich” of 2 plates of zinc plated 4043 steel with a 17-4 SS link, would they produce corrosion?

Thank you

Metalguy (Materials) · Answer 1 · 2003-08-29 17:47:51

Not if it's dry! Otherwise you have the makings of a battery there.

MikeBurns (Materials) · Answer 2 · 2003-09-02 09:19:49

Also, zinc plated 4340 is susceptible to hydrogen stress cracking (aka hydrogen embrittlement) in a corrosive evironment if the hardness exceeds about 35 HRC, equivalent to a tensile strength of about 157 ksi.

17-4 PH can also be susceptible to hydrogen embrittlement coupled to zinc in corrosive environments.

mexmech (Mechanical) · Answer 3 · 2003-09-02 10:18:40

Thanks for the replays.

So if this assemble is outdoors (on a crane) a rain or humidity will produce corrosion, right?

What could be a simple way to threat the 4340 steel in contact with SS to avoid corrosion while being outdoors?

hacksaw (Mechanical) · Answer 4 · 2003-09-05 13:11:26

you question has been answered in part, if it is continuously exposed to an electrolyte(conductive) solution you may have a problem.

defining the degree of concern further definition of your question and possible testings.

ss tends to passivate and reduce the level of concern, but there are a lot of environments that can breakdown the passivation and trigger corrosion.

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Would zinc coated 4043 steel with 17-4 SS produce corrosion?