BS/EN 2899-2018 pdf download.Aerospace series – Vulcanized rubbers – Test on the susceptibility to corrosion in a damp atmosphere of metals in contact with vulcanized rubbers.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2071, Aerospace series— Sheets in aluminium and aluminium alloys— Thickness 0,25 mm ≤a ≤6 mm — Dimensions
EN 22171, Steel FE-PL52 S — 1 080 MPa ≤Rm ≤1 250 MPa — Sheets and plates 2mm ≤a ≤20 mm — Aerospace series2
EN 2395. Aerospace series — Aluminium alloy AL-P2014A — T4 or T42 — Sheet and strip — 0,4mm ≤a ≤6mm
EN 3525, Aerospace series — Steel FE.PL1505 (15CrMoV6) — Air melted — Hardened and tempered — Plate—6mmca≤2Omm—1O8OMPQ≤Rm≤128OMPa
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedla: available at http://www.electropedla.org,’
• ISO Online browsing platform: available at http:/Jwww.iso.orgJobp
3.1
contact corrosion
the visually perceptible deterioration of the metal surface in contact with rubbers, after exposure in a damp atmosphere
4 Principle
The rubber test pieces shall be directly placed after immersion in the test fluid between two test metal disks and exposed to a damp atmosphere under defined conditions. After exposure, the metal disks shall be visually examined so that deterioration due to corrosion can be noted.
— polyethylene gloves; appropriate solvent;
— lint free cotton cloth; test fluids.
6 Specimens
6.1 Metal disks
6.1.1 MaterIal
Type 1 – Aluminium alloy AL-P2014A – T4 or T42 according to EN 2395.
Type 2— Steel FE-PL5ZS — 1 080 MPa ≤Rm≤1 250 MPa according to EN 2217.
6.1.2 Dimensions
The metal to be tested shall be circular disks of an outer diameter (120 *0,5) mm, with a (20 + 0.2) mm diameter hole in the centre (see Figure 1).
These disks shall be 5 mm thick minimum if they are in steel and 10 mm minimum thick if they are in
aluminium so that they are not deformed when gripped.
6.1.3 Preparation
The metal disks shall have a roughness of 0,4 m maximum on all surfaces. The edges shall be rounded.
6.1.4 Number
For each test and exposure method, use two metal disks. The two disks maybe made of the same metal or of two different metals.
6.2 Rubber test pieces
6.2.1 Material
According to the material standard.
7 Test conditions
7.1 Test temperature
The temperature shall be (23 ±2) C.
7.2 Testing time
The testing time shall be 7 d or a multiple of 7 d.
7.3 Humidity
The relative humidity shall be 95 % minimum.
8 Procedure
Clean all the surfaces of the metallic disks and the rubber test pieces with a lint free cotton cloth soaked in an appropriate solvent and leave to dry for 2 h minimum at (23 2) °C.
After cleaning, the degreased test pieces shall not be touched with bare fingers; they shall only be handled with polyethylene gloves.
Depending on the method chosen, the rubber test pieces and the metallic disks shall be conditioned as follows:
Method A:
The rubber test pieces and metallic disks shall be immersed in the test liquid for 15 mm at a temperature of (23 ±2) °C, then allowed to drain.
Method B:
The rubber test pieces and metallic disks shall not undergo any conditioning.
Next, place the rubber test pieces and the annular isolating block between the two metallic disks.
The isolating block shall be chosen with a thickness such that the rubber test pieces are compressed by
(12 3) %.
Tighten the assembly until it comes to rest against the block
Place the assembly in the test chamber in a damp atmosphere.
NOTE The test pieces shall be placed at a distance of at least 10 mm from the edges of the metallic disks and arranged symmetrically (Figure 1).
At the end of exposure time, the test assembly shall be placed in a normal atmosphere for (30 ±5) mm at (23 ±2) °C. The metallic disks shall be separated from the rubber test pieces, then cleaned using appropriate solvents to eliminate all traces of rubber.
The two metallic disks shall be then subjected to a visual examination at x 20 magnification to detect any discolouration or sign of corrosion.
9 Interpretation of results
Any discolouration or surlace deterioration ot the metal strip shall be described in the rest report.
10 Designation.BS/EN 2899-2018 pdf download.

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