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The inspection standard of the electroplating part

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