This standard specifies the definition, technical requirements, test methods and inspection rules for the blackening of sewing machine steel parts. This standard applies to the blackening of sewing machine steel parts. QB/T 2505-2000 Technical conditions for blackening of sewing machine parts QB/T2505-2000 Standard download decompression password: www.bzxz.net

Classification No. Y
Registration No. 7811—2001
Light Industry Standard of the People's Republic of China
QB/T 2505— 2000
Technical Conditions for Blackening of Sewing Machine Parts
Published on 2000-12-01
State Bureau of Light Industry
Implemented on 2001-06-01
8/T 2505--2000
This standard is revised on the basis of the technical requirements of the series standard ZBY17012-1985 (the standard is issued by the China Electric Power Network No. [1909]: 12 document conversion standard No. QB/13542-1999, which can be used in the interior room). The main technical changes of this standard group are as follows: - Added the definition of "steel defect blackening":
"Technical requirements" added "the provisions on the restriction of adding a change" added the inspection method,
This standard is issued by the national final industry member Management City proposed this standard National machine standard promotion center door this standard starting position: Shang Shangbei products have fear of the public, the main sea installation quota machine list. This standard 1 must! Beijing people, breeding sensitive non spicy deep.
This standard Hong Kong implementation of the export: Beijing industry general release of the industry table: standard QB/T3542--199 national machine safety planning black limb technical conditions 3 abolished,
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People's Republic of China light industry industry standard
sewing machine parts black technical conditions
QB/T 2505—2000
T#QT3542-1999
This standard specifies the definition, technical requirements, and inspection rules for the chemical treatment of fine red steel pliers. This standard is used for the treatment of silver-plated iron parts. 2 Definitions
This standard adopts the above definition,
Steel blackening
Add an oxidizing solvent or other blackening agent to the surface of the part in the air to make the surface of the part become a blue-black film:
3 Requirements
3. Surface items
3. The parts treated with blackening should have a uniform color. 3.1.2 Blackening The black surface has no defocus spots, zero sinking or mechanical damage caused by the whole process of accumulation of evidence and other defects.
3.1.3 The color of the surface may be different due to the same processing technology (treatment, fire) or different materials.
3.2 The surface treatment of the surface must have two certain properties: 3.3 The deformation before the blackening treatment shall not affect the subsequent treatment. The surface can be used at the same time. 4 Test force method
4.1 Appearance test
Write the blackening surface of the test piece under the condition of [30U 50) 1x, equivalent to 40W three-way light, and the viewing distance is 008m. Check whether the color is uniform and dense, whether there are obvious defects such as precipitates and machine scratches.bzxz.net
4.2 Abrasion resistance test
For those that have passed the appearance test, use cotton yarn with a pressure of N to wipe them for 1.5m. There shall be no discoloration or damage.
4.3 Corrosion test
4.3.1 Degrease the tested parts and put them into 5% oxalic acid solution. Keep them at room temperature for 8m, then take them out of the solution and rinse them with water. No spots can be seen on the surface. 4.3.2 Spray 5% salt solution continuously at 35°C and 1000°C force for 3h after cleaning. Then rinse with water and observe that there shall be no rust. 4.4 Density test required: Spray the test parts after wiping for 1m with 3% sulfuric acid solution neutralized in advance with oxidizing agent: Keep at room temperature for more than 1m, take out the test parts, rinse with water and observe that there shall be no red color on the surface, except for the calibration.
5 Inspection rules
5.1 The quality inspection of blackened parts shall be carried out by the technical inspection department of the manufacturing plant. The unit has the right to conduct a review of the quality of the parts after they are shipped.
2 The process shall be agreed upon by both parties. 5.3 After the blackening inspection, the technical inspection department shall issue a quality certificate. The content of the certificate shall include: drawing number, part number, actual part number, quality inspection results and product standard number. 5.4 All parts shall be treated with anti-corrosion before leaving the factory.
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