BS/EN 12438-2017 pdf download.Magnesium and magnesium alloys Magnesium alloys for cast anodes.
This BS/EN 12438 specifies the grades and the corresponding requirements for magnesium alloys for cast anodes.
This European Standard specifies 2 groups of cast magnesium alloy grades by a classification based on chemical composition. The first group deals with magnesium alloy ingots for anodes. The second group deals with magnesium alloy anode castings.
This European Standard specifies chemical composition, designation, testing and inspection documentation.
This European Standard does not cover technical delivery conditions for magnesium alloy anode castings (see EN 1559-1 [31 and EN 1559-5 141)
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10204. Metallic products- Types of inspection documents
EN ISO 80000.1:2013, Quantities and units – Part 1: General (ISO 80000-1:2009 . Cor 1:2011) 3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
anode
electrode where oxidation reactions take place
3.2
galvanic anode
anode attached to a metal object to inhibit the corrosion of the object
4 Designations
4.1 Material
The material shall be designated either by symbol or by number as given in Table 1 and Table 2. NOTE The comparison of EN 12438 grade designations with the designations from the previous version of this European Standard is given in Annex C.
5 Order information
The following information shall be supplied by the purchaser:
a) the number of this European Standard;
b) the designation of the material;
c) any special requirements.
All requirements shall be agreed between the manufacturer and the purchaser by the time of acceptance of the order (e.g. technical delivery conditions according to EN 1559-1 [3] and
EN 1559-5 [41).
6 Manufacture
The manufacturing process shall be left to the discretion of the manufacturer unless otherwise agreed at the time of ordering.
NOTE The manufacturing process covers all operations up to the delivery of the product.
7 Requirements
7.1 Chemical composition
The chemical composition of magnesium alloy ingots for anode castings shall be in accordance with the requirements given in Table 1.
The chemical composition of magnesium alloy cast anodes shall be in accordance with the requirements given in Table 2.
If not otherwise specified in the enquiry and order, the chemical composition of the ingots or the cast anodes shall relate to that of the samples taken from the melt at the time of pouring.
7.2 General condition of the product
The product shall have a clean surface, in accordance with an agreement between the manufacturer and the purchaser, and shall be free from visible and internal imperfections to a level also agreed between the manufacturer and the purchaser.
8.1 General
Samples for the determination of the chemical composition shall be made from the same material as that used to produce the product which they represent.
All samples shall be adequately marked to guarantee lull traceability to the product which they represent.
The samples for the determination of the chemical composition shall be cast in a manner which ensures accurate results.
8.2 Frequency and number of tests
Samples, representative of the material, shall be produced at a frequency in accordance with the
process quality assurance procedures adopted by the manufacturer or as agreed with the purchaser.
The quality assurance procedures for sampling should be based on appropriate and recognized
statistical principles.
9 Testing
9.1 Determination of the chemical composition
The methods used to determine the chemical composition of the material shall be in accordance with standardized methods or validated procedures.
9.2 Rounding of results of chemical analysis
In recording the result obtained for any value specified in this European Standard, it shall be expressed to the same number of decimal places as the corresponding value in this European Standard. Rounding shall be carried out as specified in EN ISO 80000-1:2013, B.2 and B,3, In 8.3, it is left to the discretion of the manufacturer as to whether to use Rule A or B, unless the use of one of the rules has been agreed at the time of acceptance of the order.
9.3 Electrochemical testing
If applicable, electrochemical testing shall be carried out in accordance with Annex A and Annex B.
10 Inspection documentation
When requested by the purchaser and agreed with the manufacturer, the manufacturer shall issue for the products the appropriate inspection documentation according to EN 10204.BS/EN 12438-2017 pdf download.