BS EN 12329:2000 Corrosion protection of metals - electrodeposited coatings of zinc with supplementary treatment on iron or steel (withdrawn)
Caution: EN 12329 was approved as a European Standard as it received the requisite support amongst the 19 member bodies of the European Committee for Standardisation (CEN). The UK therefore has an obligation to implement EN 12329 as its national standard and to withdraw BS 1706 with which it conflicts. However, attention is drawn to the fact that the UK did not support this standard on the basis of possible safety implications, these being related to the commencement of heat treatment as described in clause 6. The UK concern is that once a sub-microscopic crack forms in the coated article, at present there is no means for its detection and it cannot be “removed”. Following the initiation of a sub-microscopic crack no subsequent heat treatment can repair the damage already sustained. It is essential therefore that the delay in applying heat treatment is as short as practicable. The UK recommendation therefore was to amend the requirement in clause 6 to “heat treatment shall commence as soon as possible, preferably within 1 h, but not later than 3 h after plating” in accordance with those conditions given in ISO 9588. The recommendation was not accepted by the CEN Technical Committee responsible for the development of EN 12329.