標準號：BS 7371-8-2011
中文標準名稱：金屬緊固件涂層.鍍鋅涂層規范
英文標準名稱：Coatings on metal fasteners. Specification for sherardized coatings
標準類型：A29
發布日期：2011/3/31 12:00:00
實施日期：2011/3/31 12:00:00
中國標準分類號：A29
國際標準分類號：21.060.01;25.220.40
適用范圍：This part of BS?7371?specifies requirements for sherardized coatings on iron and steel fasteners and accessories applied by thermal diffusion of zinc powder onto a component’s surface.NOTE Hydrogen embrittlement is not induced as a result of this coating process.The coating consists of zinc/iron alloys, which are subsequently treated using either a zinc phosphate treatment (see BS 7371-9:1996, Type 2) or a suitable substitute treatment similar to those used in electroplating zinc (see BS 7371-3:2009) and mechanical plating (see BS?7371-7:2010). This results in a dust free surface, which, when required, can be lubricated to give controlled torque/clamping force properties (see?BS?7371?2:1993).In addition to the requirements in this part of BS 7371, the requirements in BS 7371-1:2009 that are applicable to sherardized coatings apply.This part of BS?7371?also specifies requirements for:a) the local coating thickness for six grades of coating;b) possible types of post treatment;c) the assessment of corrosion resistance of unused coated parts when subjected to neutral salt spray testing (see BS EN ISO 9227-2006).