Steel 45 75mm Industrial Swivel Casters For Communication Equipment

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Control and detection of galvanizing process for casters
(1) Three links that should be strictly controlled in electro galvanizing of caster Hardware:
1. Electroplating pretreatment of caster Hardware: electroplating pretreatment of caster hardware

is the basis for electroplating of caster hardware and the key to ensure product quality. Before

electroplating, the plated substrate of caster hardware is not treated to the specified requirements,

even if there is a good electroplating solution for five gold parts of caster, With proper electroplating

parameters of caster hardware, equipment and skilled personnel that can well regulate the

electroplating parameters of caster hardware, it is impossible to obtain the electrodeposited coating

of caster hardware that meets the quality requirements. Before electroplating of caster hardware, it

is not only necessary to remove the grease on the base metal and foreign objects that affect the

coating adhesion and other quality requirements, The oxide on the surface shall also be removed

to make the surface have the specified cleanliness and certain activity, so as to ensure the firm

combination of the coating and the substrate. Sometimes, according to the required appearance

of the electroplated coating of caster hardware, some other special pre electroplating treatment

of caster Hardware shall be carried out. The executive standard is GB / t12611-90

2. Electroplating process control of caster hardware. The service conditions and service life of

electro galvanized metal or components of caster hardware are closely related to the thickness

of electro galvanized coating of caster hardware. The stricter the service conditions and the longer

the service life, the thicker the required electro galvanized coating of caster hardware. Different

products should be used according to the specific environment (temperature, humidity, rainfall

Atmospheric composition, etc.) determine the plating thickness of caster hardware with the expected

service life. Blind thickening will cause various wastes. However, if the thickness is insufficient, it will

not meet the expected service life requirements. Different manufacturers should first prepare a set

of complete and reasonable process flow to clarify the plating parameters of caster hardware

according to their own equipment conditions and under the condition of determining the plating type,

Control the electroplating solution concentration of caster hardware and carry out standard operation

3. Post plating treatment: Post plating treatment of caster hardware (passivation, hot melting, sealing

and dehydrogenation, etc.) to enhance the protective performance, decoration and other special

purposes of the plated parts. After galvanizing, chromate passivation or other conversion treatment is

generally required, Forming corresponding type of conversion film is one of the key processes to

ensure the quality after plating. Aging treatment (70 ~ 80oC in the oven) is better after passivation.

Passivation can be divided into the following forms: (1) Color Passivation: HNO3, H2SO4 and CrO3

(three acids are indispensable) (2) blue white passivation: F + Cr (3) silver white passivation: Ba + Cr

(4) black passivation: Cr + Ag or Cr + Cu (5) golden yellow passivation: Cr + reductant. Color

Passivation: suitable for zincate zinc plating, After passivation, the part surface is red, green and

slightly yellow (Cr + 6 red, Cr + 3 green), and purple cannot appear (it indicates that the passivation

film is loose). The simplest method is to rub repeatedly on the part surface with your fingers for

several times, and there can be no color change (loss). Blue, white and blunt: because the fluoride in

the passivation solution decreases gradually with time, the blue color of the part surface will gradually

become lighter, The color of workpieces produced in the same shift is not well maintained. Therefore,

it is necessary to strictly control the passivation process and pay attention to the thickness. Silver white

blunt: it does not change with time and the color is consistent

(2) Product quality inspection
1. Strictly implement the current national standards: (1) < metal coating, Electroplated coating of zinc

castor hardware on iron and steel > GB / T 9799-1997 EQV 250 2081:1986 (2) < chromate conversion

film of electroplated zinc plating and cadmium plating on castor hardware > GB / T 9800-1988eqv 250

4520:1981 (3) < corrosion test in artificial atmosphere: salt spray test > GB / t10125-1997 2. Inspection

requirements: both parties shall sign a technical agreement before production, which shall be carried

out in principle. (1) large parts: each piece must be inspected, No missing inspection. (2) small parts:

sampling inspection method shall be adopted. 5% of each batch shall be sampled. If 1% is unqualified,

another 10% shall be sampled. If 1% is still unqualified, the whole batch shall be unqualified.

(3) inspection procedure: A. appearance inspection: inspect according to drawings, processes and

standards, and reserve sample standards together with the manufacturer( Seal with varnish or plastic

film as a comparison sample. There shall be no obvious coating defects on the main surface of

electroplating parts of caster hardware, such as blistering, porosity, roughness, crack or no coating

locally, Except for unavoidable coating defects caused by base metal defects, the plated parts shall

be clean and free of damage, and the coating shall be bright (unless otherwise specified). B. coating

thickness inspection: use a thickness gauge for inspection. (the user's requirements are the standard).

(the minimum local thickness is generally specified) coating thickness for general purposes: 6 = 8 ~

12um. For outdoor use: 6 = 18 ~ 22um. Bolts and nuts: 6 = 3 ~ 6um. C. the functional positioning of

the coating shall be reasonable : after galvanizing, if there are no special requirements, the brightness

should not be too high. If it is too high, the brittleness of the coating increases and the color changes

quickly. It must be reasonable and the amount of brightener should be controlled. D. There should be

no missing plating, scorching and peeling in the depth of the blind hole. Color differences are allowed,

and there can be slight scorching at the sharp corners of large parts. 3 inspection method: under the

irradiation of natural scattered light or two 40W fluorescent lamps, At 500mm (visual inspection), the

problems found in this state are quality problems. If they are not found, they are allowable defects

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