DSH 168A Resistance to corrosion of current-carrying parts

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DSH 168A ' s. O9 X( {6 ?2 Q* _ ( R  s% R, h$ e0 h

Resistance to corrosion of current-carrying parts

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Generality   {5 Z# h! |; e) P4 \) K6 w

& D) t1 e0 C0 |  LQuestion:
- m. x+ k2 N) Z* dHow to judge whether a current-carrying part is resistant to corrosion ?
1 C* y9 k: b# k! L0 I( [' mDecision:
CEE Recommendation n. 9 “Corrosion of current-carrying parts” may be applied to judge whether a current-carrying part is resistant to corrosion .
It is quoted in CB Bulletin No. 41 (September 1981).
& u7 X  L- L' E3 i0 H) p+ PIn the following, for convenience, is reported a part of it:
RECOMMENDED TEXT, SCREWS, CURRENT-CARRYING PARTS AND CONNECTIONS.
  n4 b$ {  z0 F5 Va) 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.
; B% U( R. |& r) @- a! OCompliance is checked by inspection and, if necessary, by measurement and by chemical analysis.
, b8 l/ D2 N6 N* x& T' IAfter 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:
- copper,
! h0 @  S- E' f' R1 `- an alloy containing at least 58% copper for parts that are worked cold or at least 50% copper for other parts,
- stainless steel containing at least 13% chromium and not more than 0,09% carbon,
3 a* q* n2 U/ v2 g3 c8 q3 i/ e. [- 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,
# J  f3 m2 Y9 a! |/ v0 ~6 ^7 K6 r- n* 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:
* service condition no. 2 for ordinary equipment,
% Y5 ]% O& e) `* I* 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.
Zinc and other metals which are soft or liable to creep are not considered to be suitable for current-carrying parts and terminals .
The 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.
: I8 Y1 X2 f! O2 i- _* {8 \: jb) 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 .
" c& p* A, M; C7 d" U, A% OCompliance is checked by inspection.
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