DSH 168A Resistance to corrosion of current-carrying parts

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DSH 168A / \6 B  ^9 s8 H

Resistance to corrosion of current-carrying parts # P1 E: d! E% _  ~3 _# R2 }) [6 u

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Generality 8 U* F: i7 W; F" X6 H

Question:
  g, L2 S$ e! Q( b2 Y4 \' xHow 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 .
: x2 Y/ n- Q4 x8 P2 {It is quoted in CB Bulletin No. 41 (September 1981).
, w* N: Z2 d, DIn the following, for convenience, is reported a part of it:
RECOMMENDED TEXT, SCREWS, CURRENT-CARRYING PARTS AND CONNECTIONS.
" T" R. Z5 u9 I, f0 c7 A! x9 L- Wa) 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.
' |' J' \1 X7 I# M$ T2 S' SCompliance is checked by inspection and, if necessary, by measurement and by chemical analysis.
After 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,
- 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,
+ k- t0 X) V) _3 t9 V3 g3 N! V- steel provided with an electroplated coating of zinc according to ISO Publication 2081-1973, the coating having a thickness of at least:
# ]. `) [; Z& B1 z: ]: q, ?* 5 T ISO grade “1 mild” for ordinary equipment,
* p+ P- N! I8 [  n* s* 12 T ISO grade “2 moderate” for jet-proof and splash-proof equipment,
3 j& \  J5 q; n/ |* 25 T ISO grade “3 severe” for jet-proof and watertight equipment.
! V, b4 b2 G' g- 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:
# k. b( `1 k% A. K  i* service condition no. 2 for ordinary equipment,
1 z! w8 Y$ T6 N7 H3 E7 S% D! B* service condition no. 3 for drip-proof and splash-proof equipment,
/ G. A7 j, m1 H" I" f0 ~3 ?* 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;
) x7 [6 _% x: {9 V' ghowever, 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.
0 L* ~! Q6 ~% A3 EZinc 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
& w. h9 e' Y2 Vmeasurement described in ISO Publication 1463-1973.
- ?, g# R8 _( b" Ib) 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 .
Compliance is checked by inspection.
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