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YY 0076-1992 PDF English


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YY 0076-1992: PDF in English

YY/T 0076-1992 (Renamed from YY 0076-92) YY PHARMACEUTICALS INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA C 30 YY 0076-92 Replacing WS 2-1-73 Coating classifications for metal product - Technical conditions ISSUED ON: JANUARY 20, 1992 IMPLEMENTED ON: JULY 01, 1992 Issued by: State Pharmaceutical Administration Table of Contents 1 Scope ... 3  2 Normative references ... 3  3 Classification of plating ... 3  4 Technical requirements for plating ... 4  5 Acceptance rules, inspection methods, marking ... 12  Additional Information: ... 15  Coating classifications for metal product - Technical conditions 1 Scope This standard specifies the requirements for classification, application scope, technical requirements, acceptance rules, inspection method, markings of the electroplating of medical equipment. This standard is applicable to the single-layer (nickel, chromium, zinc, tin, silver, gold, cadmium, black nickel) plating and multi-layer (nickel + chromium, nickel + nickel + chromium, copper + nickel + chromium, copper-tin alloy + chromium) plating of the metal articles for protective decoration purpose. 2 Normative references GB 1031 Surface roughness - Parameters and their values GB 1238 Designation symbols for metal coatings and chemical treatments GB 6463 Metallic and other non-organic coatings - Review of methods of measurement of thickness 3 Classification of plating 3.1 According to the working conditions and structural requirements of metal parts, the plating is divided into the following 6 categories. 3.1.1 Category I ~ III plating: Used for metal parts for special structural requirements. 3.1.2 Category IV plating: Used for metal parts which are used in good working conditions, such as those used in slight erosive environment. 3.1.3 Category V plating: Used for metal parts which are used in general working conditions, such as those used in generally erosive environment. 3.1.4 Category VI plating: Used for metal parts which are used in severe working conditions, such as those used in severely erosive environment. 3.2 The scope of application of plating in various medical equipment is as shown in Table 1. 4.3.4 Grading requirements for the copper-tin alloy plating appearance are as specified in Table 7. Table 7 Type Grade Appearance requirements Shared features Different features Matt platin The plating is golden yellow; the texture is fine and dense; the surface shall be bright. It is not allowed for delamination, blistering, scratches, spongy deposits. It is allowed for slight roughening. Except for the mating surfaces and the inner surface where plating is unfeasible, all other surfaces shall be plated The surface shall be smooth; the color shall be uniform. It is not allowed for flowing marks, visible cracks, pinholes, pitting, burrs. It is allowed for slight hanging marks on secondary locations. The surface is relatively smooth; the color shall be uniform. It is not allowed for flowing marks or visible cracks, pinholes. It is allowed for slight pits, burrs, or hanging marks on secondary locations. The surface color is relatively uniform. It is not allowed for visible cracks, pinholes. It is allowed for slight flowing marks, pits, burrs, or hanging marks. Matt platin The plating is golden yellow; the texture is fine and dense. It is not allowed for delamination, blistering, spongy deposits. Except for the mating surfaces and the inner surface where plating is unfeasible, all other surfaces shall be plated The surface color shall be uniform; the silking shall be uniform. It is not allowed for scratches, flowing marks, visible cracks, pinholes, pits, spots, burrs. It is allowed for slight roughening or slight hanging marks on secondary locations. The surface color shall be uniform; the silking is relatively uniform. It is not allowed for scratches, flowing marks or visible cracks, pinholes. It is allowed for roughening or slight pits, spots, burrs, hanging marks on secondary locations. The surface color is relatively uniform. It is not allowed for obvious scratches, cracks, pinholes. It is allowed for roughening or slight flowing marks, pits, spots, burrs, or hanging marks. Note: This Table is applicable to the copper-tin alloy plating which has a tin content of 8% ~ 12%. 4.3.5 Grading requirements for the appearance of zinc plating and cadmium plating are as specified in Table 8. Table 13 µm Type of plating Part requirements Surface roughness before polishing, Ra Surface roughness after plating, Ra ≤ Nickel plating Chromium plating Bright With matching relation, geometric shape requirements unchanged, clear edges and corners 1.60 0.20 Without matching relation, geometric shape allowed to have slight deformation 6.3 0.20 Matt With matching relation, geometric shape requirements unchanged, clear edges and corners 1.60 1.60 Without matching relation, geometric shape allowed to have slight deformation 6.3 1.60 Sliver plating Bright With matching relation, geometric shape requirements unchanged, clear edges and corners 1.60 0.20 Without matching relation, geometric shape allowed to have slight deformation 6.3 0.20 Matt With matching relation, geometric shape requirements unchanged, clear edges and corners 1.60 0.80 Without matching relation, geometric shape allowed to have slight deformation 6.3 0.80 Gold plating With matching relation, geometric shape requirements unchanged, clear edges and corners 1.60 0.20 Without matching relation, geometric shape allowed to have slight deformation 6.3 0.20 Note: 1. In order to ensure plating quality, the maximum value of the surface roughness Ra before the part is polished is generally 6.3 µm; the maximum value of the Ra of the hospital equipment is 12.5 µm; the maximum value of the surface roughness Ra with bright plating is 0.4 µm. 2. The surface roughness of the multi-layer plating is same as that of the chromium plating. 3. To reach the requirements for surface roughness after plating as shown in the Table above, for the parts which do not allow for polishing or the parts which cannot be processed, it shall reduce the surface roughness before polishing based on actual conditions. 5 Acceptance rules, inspection methods, marking 5.1 The plating of the parts is in the unit of piece. The inspection department of the manufacturer will inspect it. 5.4.3 The references for the grades of brightness: Table 14 Grade of brightness Full-bright Bright Semi-bright Matt Symbols L3 L2 L1 - Example of technology Substrate surface Polished Polished Non-polished Non-polished Plating surface Polished Non-polished Non-polished Non-polished Electrolyte Without brightener With brightener With brightener Without brightener Note: 1. When there is no instrument for the measurement of brightness, the technologies as listed in the Table above are used to represent the brightness concept. These technologies are not unique methods. 2. The surface roughness before the substrate is plated is specified by each organization. 5.4.4 The appearance grades after plating are represented by the grade codes in Table 4 ~ 12. The bright plating "Liang" is indicated by L3 (full-bright), L2 (bright), L1 (semi-bright). For the zinc plating and cadmium plating after passivation, the rainbow color "Dun Cai" is indicated by DC; the silver white "Dun Bai" is indicated by DB. The surface roughness's codes are represented in accordance with the provisions of GB 1031. 5.5 For parts which need plating, it shall be marked according to the provisions of GB 1238 in the design drawings and other design documents. Example 1: For the electroplating category V nickel + chromium plating; full bright; grade 1 appearance, Ra0.20 µm, the marking, appearance grade and Ra are represented as follows: D • L3Ni13/Cr0.5; grade 1 appearance; Ra0.20 µm. Example 2: For the electroplating category V nickel + + nickel + chromium plating; bright; grade 1 appearance, Ra0.20 µm, the marking, appearance grade and Ra are represented as follows: D • L2Ni9/Ni4/Cr0.5; grade 1 appearance; Ra0.20 µm. Example 3: For the electroplating category IV zinc plating; rainbow color; grade 2 appearance, Ra6.3 µm, the marking, appearance grade and Ra are represented as follows: D • Zn20 • DC; grade 2 appearance; Ra6.3 µm. ____________________ ......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.