DSH 168A Resistance to corrosion of current-carrying parts

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DSH 168A   g8 K' H- o1 ~3 B

Resistance to corrosion of current-carrying parts

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Generality

Question:
How to judge whether a current-carrying part is resistant to corrosion ?
Decision:
CEE Recommendation n. 9 “Corrosion of current-carrying parts” may be applied to judge whether a current-carrying part is resistant to corrosion .
' E8 i2 Y# S; W( K& j/ vIt is quoted in CB Bulletin No. 41 (September 1981).
- o  {( X) r  _6 \, T2 w% k- fIn the following, for convenience, is reported a part of it:
  h5 g; x" q4 e1 Y, lRECOMMENDED TEXT, SCREWS, CURRENT-CARRYING PARTS AND CONNECTIONS.
% A4 D* F& |5 K( \+ aa) Current-carrying parts and parts of terminals shall be of a metal having, under the conditions occurring in the equipment, adequate mechanical strength and resistance to corrosion.
Compliance is checked by inspection and, if necessary, by measurement and by chemical analysis.
4 c% ~9 c2 K4 uAfter all the tests of the relevant specification, the current-carrying parts and parts of terminals shall show no appreciable deformation.
Examples of suitable metals, when used within the permissible temperature range and under normal conditions of chemical pollution, are:
9 y3 S( U& r" M/ W1 v- copper,
1 s. W: U3 ^9 q2 \: Q- an alloy containing at least 58% copper for parts that are worked cold or at least 50% copper for other parts,
& o# o( m, M* S1 \- stainless steel containing at least 13% chromium and not more than 0,09% carbon,
, E8 o4 ~; c& P; ^( Z& l0 O- steel provided with an electroplated coating of zinc according to ISO Publication 2081-1973, the coating having a thickness of at least:
* 5 T ISO grade “1 mild” for ordinary equipment,
* 12 T ISO grade “2 moderate” for jet-proof and splash-proof equipment,
! D0 k7 S4 J; k/ U- ~9 ^2 H) z* 25 T ISO grade “3 severe” for jet-proof and watertight equipment.
- steel provided with an electroplated coating of nickel plus chromium according to ISO Publication 1456-1974, the coating having a thickness at least equal to that specified for:
% [" x" m7 [/ i3 `, c  J* service condition no. 2 for ordinary equipment,
9 u, M- m/ U1 X0 S* service condition no. 3 for drip-proof and splash-proof equipment,
* service condition no. 4 for jet-proof and watertight equipment.
- Aluminium and its alloys, provided special measures are taken for removing, where necessary, the oxide layer, for obtaining a sufficient and durable contact pressure and for ensuring that the point of connection withstands the corrosion test specified;
however, until a suitable corrosion test and an electrical performance test are available, aluminium and its alloys should preferably not be used for current-carrying parts and terminals within the equipment.
* Q% F1 \  S! b" |1 y4 `$ _7 FZinc and other metals which are soft or liable to creep are not considered to be suitable for current-carrying parts and terminals .
6 h8 j1 R5 o! w# |) sThe thickness of the electroplated coatings on steel may be determined by the magnetic method described in ISO Publication 2178-1972, or by microscopical
measurement described in ISO Publication 1463-1973.
  `+ u% s" ~9 o4 A( Bb) Under moist conditions, metals showing a great difference of electrochemical potential with respect to each other shall not be used in contact with each other .
4 B- c9 N& ?0 R* ?- V! lCompliance is checked by inspection.

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