Specifies coatings consisting principally of zinc applied to iron and steel articles by the sherardizing process to protect them against corrosion. Deals with the purity of the zinc powder used in the sherardizing process and with the thickness, appearance and adhesion of the coating. Two classes of coating thickness are specified together with the reference method of determining the coating thickness. Gives advice on the condition of the basis metal and the need for post treatments.
Số hiệu tiêu chuẩn
BS 4921:1973
Tên tiêu chuẩn
Specification for sherardized coatings on iron and steel articles
Ngày phát hành
1973-02-28
Tiêu chuẩn liên quan
BS 410 * BS 872
Thay thế cho
Replaces BS 729:Part 2:1961.
Từ khóa
Sherardizing * Metal coatings * Coatings * Zinc * Steels * Iron * Castings * Particle size distribution * Dust * Thickness * Threaded components * Clearances * Weight measurement * Protective coatings * Thickness measurement * Free spaces * Zones of comfort * Play activities * Games
BS 4921:1973
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