BS 7371-7-2010 金属紧固件涂层.采用机械法施加锌涂层规范

标准号：BS 7371-7-2010
中文标准名称：金属紧固件涂层.采用机械法施加锌涂层规范
英文标准名称：Coatings on metal fasteners - Specification for mechanically applied zinc and zinc based coatings
标准类型：A29
发布日期：2010/4/30 12:00:00
实施日期：2010/4/30 12:00:00
中国标准分类号：A29
国际标准分类号：21.060.10;25.220.40
适用范围：This part of BS 7371 specifies requirements for coatings applied bymechanically impacting zinc powder, or zinc based powder on to thecomponent surface in an aqueous medium. The coating is not appliedby using impact media accelerated by compressed air or centrifugemethods. The coatings consist principally of zinc and can be lubricatedto give controlled torque/clamping force properties when required.This part of BS 7371 also specifies requirements for:a) the coating thickness;b) the type of conversion treatment to be applied, which can behexavalent, tri-valent or chromium free;c) the quality assessment of the corrosion resistance of unusedcoated parts when subjected to neutral salt spray testing;NOTE 2 See, for example, BS EN ISO 9227.d) the adhesion test.The coatings are suitable for application to metal components such as:1) parallel threaded fasteners and accessories;2) screws that cut or form their own threads, e.g. self-tappingscrews;NOTE 3 See, for example, BS 4174.3) woodscrews;NOTE 4 See, for example, BS 1210.4) springs and spring components;5) pipe nuts and connectors with parallel or tapered threads;6) composite fasteners incorporating non-conducting materials(e.g. rubber-bonded assembly).When these coatings are applied to non-ferrous fasteners, the only partof the specification that applies is the coating thickness requirements.