Electroplating Part:
1. Scopes
This standard indicates the inspection contents and methods of electroplating part and is suitable for inspections of incoming materials and semi-finished products of the company.
2. The reference standard
GB/T 2828-2003 The National Standard of the People’s Republic of China (used for batch inspections of products).
3. Definitions
3.1 Side A: Refers to the front side of the electroplated part, which is the surface that can be seen directly in the process.
3.2 Side B: Refers to the four sides of the electroplated part, which can be seen after the electroplated part is turned 45 to 90 degrees.
3.3 Soft scratches: no deep scratches and you won’t feel the scratches with your hands.
3.4 Hard scratches: Scratches or deep scratches caused by friction of hard objects.
3.5 Burr: a burr occurs on the edge of the plastic due to injection molding and other reasons.
3.6 Pitting: a defect like a dot or a line occurs on the surface of the product due to an unclean plating environment.
3.7 Bump: a bump is found on the plated surface due to dust.
3.8 Mark: a mark is generated due to pressed mold.
4. Requirements
4. 1 Inspection steps
Packaging inspection reliability test assembly inspection dimension inspection appearance inspection
4. 2 Testing conditions
4.2.1 Light source: two fluorescent lamps with 40W illuminate the object from a distance of 1.2 to 1.5 meters.
4.2.2 Visual distance: 35±5cm
4.2.3 Visual angle: the inspection surface and the direction of the human eyes have an angle from 45°to 90°.
4.2.4 Visual time: 5 to 10 seconds
4. 3 Inspection instruments and tools
4.3.1 A caliper with an accuracy of 0.02mm
4.3.2 Standard films
4.3.3 An ordinary blade with a protective handle
4.3.4 Filler gauges
4.3.5 3 meters of tape
4.3.6 RCA wear tester
4. 4 Inspection specifications
4.4.1 Inspection items
| Inspection items | Inspection contents | Inspection tools/methods | Reference points | Results | |||||||
| min | maj | cri | |||||||||
| Packaging | The shapes or appearance of packaging boxes or bags | Visual inspections | The packaging box or bag is not serious out of shape or damaged. The product is not scattered; there is no sundry and sign of water on the product. | ||||||||
| The label | Visual inspections | The labels has information such as the manufacturer’s name, product name, quantity, manufacturing date, etc. There should be a label of qualification on the product. Acceptance papers of incoming materials should be for reference. | |||||||||
| The manufacturing date | Visual inspections | The manufacturing date should be within one month. The material specification should be for reference. | |||||||||
| The inspection report of the manufacturer | Visual inspections | The manufacturer should provide all kinds of qualified shipment reports. The material specification and customer related standard should be for reference. | |||||||||
| The quantity and product name | Visual inspections or calculators | The quantity and product name should be correct. Acceptance papers of incoming materials should be for reference. | |||||||||
| Appearance | The surface of the electroplating part | Visual inspections | The electroplating should be good and have even gloss. The part doesn’t turn black or yellow. The engineer sample should be for reference. | MA | |||||||
| Defect contents | Areas | / | Length | Width | Diameter | Distance | Quantity | / | |||
| mm | mm | mm | mm | ||||||||
| Defects such as straight lines and curve lines | Face A (hard scratches) | Visual inspect for films | ≤ 1.5 | ≤ 0.03 | 1 | MA | |||||
| ≤ 1 | ≤ 0.03 | ＞ 20 | 2 | MA | |||||||
| Face A (soft scratches) | Visual inspect for films | ≤ 2 | ≤ 0.03 | 1 | MA | ||||||
| ≤ 1.5 | ≤ 0.04 | ＞ 20 | 2 | MA | |||||||
| Face B (hard scratches) | Visual inspect for films | ≤ 4 | ≤ 0.04 | 1 | MA | ||||||
| ≤ 3 | ≤ 0.04 | ＞ 20 | 1 | MA | |||||||
| Face A (hard scratches) | Visual inspect for films | ≤ 4 | ≤ 0.06 | 1 | MA | ||||||
| ≤ 3 | ≤ 0.05 | ＞ 20 | 2 | MA | |||||||
| Defects such as pitting and bump | Face A | Visual inspect for films | ≤ 0.1 | Doesn’t count | MA | ||||||
| ≤ 0.2 | ＞ 20 | 2 | MA | ||||||||
| Face B | Visual inspect for films | ≤ 0.15 | Doesn’t count | MA | |||||||
| ≤ 0.3 | ＞ 20 | 2 | MA | ||||||||
| Dust | Face A | Visual inspect for films | ≤ 1 | ≤ 0.05 | 1 | MA | |||||
| ≤ 2 | ≤ 0.03 | ＞ 20 | 2 | MA | |||||||
| Face B | ≤ 3 | ≤ 0.03 | ＞ 20 | 2 | MA | ||||||
| Burr | Face A | Visual inspect for films | / | / | MA | ||||||
| Face B | ≤ 1.5 | ≤ 1.5 | 1 | MA | |||||||
| Inspection items | Inspection contents | Inspection tools/methods | Reference points | Sample standards | Grades | |||||
| Appearance | Burr | Face A | Visual inspections for films | Not allowed | Not allowed | GB2828 — 2003 IL:Ⅱ
AQL: MAJ 2.5; MIN 4.0 |
MA | |||
| Face B | ≤ 1.5 | ≤ 0.15 | 1 | MA | ||||||
| The defect of the face B should not influence assembly. | ||||||||||
| Dimensions | Overall dimensions | Calipers | The material specification and engineer sample should be for reference. | GB2828 — 2003 IL: S-2
AQL: MAJ 2.5 NIN 4.0 |
MA | |||||
| Every dimensions and edges of the sample | Calipers | The material specification and engineer sample should be for reference. | ||||||||
| Thicknesses of plates | Calipers | The material specification and engineer sample should be for reference. | ||||||||
| Others | Calipers | The material specification, engineer sample and shipment report offered by the manufacturer should be for reference. | ||||||||
| Assembly | Structures of the Face A and B | Filler gauges | The gap should be less or equal to 0.2mm and no looseness after assembly. | GB2828 — 2003 IL: S-2
AQL: MAJ 2.5 |
MA | |||||
| Reliability tests | Coating adhesion tests | The blade and 3 meters of tape | Use a sharp knife to cut an area of 1MM * 1MM on the electroplating surface. There should be five horizontal and vertical checks. The lines cut by the sharp knife should be deep. Then the 3 meters of tape should be pasted on the checks and quickly pull up the tape in the direction perpendicular to the surface of the checks. After the adhesion test, the falling area of the plating layer is less than 5%. Test Procedure for Paint Adhesion should be for reference. |
Examine one piece from 5000 piece or less than 5000 piece and examine 2 piece from more than 5000 piece. |
CR | |||||
| Wear tests of electroplating layers | RCA wear testers | Using a special wear tester and a special paper tape with a load of 175G to drive the paper tape to rub on the surface of the plated part. The water plating part is qualified for 350 or more than 350 cycles, and the vacuum plating part is qualified for 200 or more than 200 cycles. Ref. Wear resistance inspection procedures》 | CR | |||||||
| Hardness tests | Hardness testers and pencils | 1H Mitsubishi pencils are used for water electroplating and HB Mitsubishi pencil are for vacuum electroplating. Use the pencil to draw five lines with 5mm under the force of 1kg on the surface of the plated part. Less than one line on the surface is qualified. | CR | |||||||
| Thickness test of the electroplating layer | Thickness
testers |
Use film thickness tester to check the thickness of the electroplating layer and the thickness should be within the range.
Ref. “Thickness Inspection Standards”. |
CR | |||||||
| Salt spray tests | Salt spray testers | The product will be qualified after the salt spray test being conducted for 24 hours. Ref. “Salt Spray Test and Inspection Standards”. | CR | |||||||
| High temperature and humidity storage | High temperature and humidity tester | Temperature +55 °C, humidity 93% RH, duration 72 hours. There should be no deformation, discoloration, damage, oxidation, corrosion, aging, etc. | CR | |||||||
| Hand sweat testing | Constant temperature and humidity tester
|
Make two filter cottons wet in solution whose PHs are 8.8 and 2.6 separately. Put at least an area of 10mm of the two filter cottons on the product and then use tape to paste them. Put the product in the constant temperature and humidity tester for 48 hours and keep the temperature 60+5℃ and humidity 90%.Check them every 24 hours. If the surface doesn’t turn white or black or fall after visual inspection, the product will be qualified. Ref. “hand sweat test instructions” | CR | |||||||