DSH 168A Resistance to corrosion of current-carrying parts

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 168A 7 W; ?9 @* c! C0 J1 p3 d/ L ! I2 I2 e8 q) g6 C! }

Resistance to corrosion of current-carrying parts

- $ C$ Q% @3 J0 Z0 O9 \

Generality

7 p! m: e8 i* D+ c' A7 ~# p* t0 cQuestion:
1 k$ K4 @# _8 p7 nHow 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 .
# p0 N7 x6 ~( o, xIt is quoted in CB Bulletin No. 41 (September 1981).
" K  g7 A! }( `1 f, KIn the following, for convenience, is reported a part of it:
RECOMMENDED TEXT, SCREWS, CURRENT-CARRYING PARTS AND CONNECTIONS.
/ K# B( p7 l- c9 pa) 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.
* y+ P4 c9 o8 N3 CCompliance 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.
: E% i& X4 e) y3 qExamples of suitable metals, when used within the permissible temperature range and under normal conditions of chemical pollution, are:
- copper,
- }4 a+ ^6 @1 G+ |1 s; }- an alloy containing at least 58% copper for parts that are worked cold or at least 50% copper for other parts,
0 D- G- z8 F6 C% j8 z- stainless steel containing at least 13% chromium and not more than 0,09% carbon,
- steel provided with an electroplated coating of zinc according to ISO Publication 2081-1973, the coating having a thickness of at least:
. c  Z" [7 [. d. {) `* 5 T ISO grade “1 mild” for ordinary equipment,
5 u' l. P9 N8 g  u/ u9 h- ?4 O* 12 T ISO grade “2 moderate” for jet-proof and splash-proof equipment,
+ h( e4 K& a7 y; s* 25 T ISO grade “3 severe” for jet-proof and watertight equipment.
" O; O  j9 T2 L+ J9 ~0 v3 |7 U8 u- 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,
6 k; y+ ]- X% V) S* service condition no. 3 for drip-proof and splash-proof equipment,
  ~7 w0 N3 p$ ^- e, s% E* 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.
' [0 S% l9 J* z; h8 nZinc 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.
) r- x; A4 Q) Qb) 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 .
2 t! {+ e) j( F. G3 mCompliance is checked by inspection.

# m+ x0 w6 Q% j9 l' {& l. H  x
8 l4 B3 U( p0 x) I3 x& g
5 }* ~+ x% k2 t5 s
% t5 @: B& Y" v, o! r7 x  {