Fastener of hardware shallow analyse, skill of hot dip zinc

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One, data of fastener of hot dip zinc
1. chemical composition
The data of fastener of hot dip galvanization should accord with the regulation of GB/T3098.1 and GB/T3098.2. In addition be in when the total content of phosphor and silicon 0.03% and 0.13% between when, recommend chooses high temperature (℃ of 530 ℃ ~560) galvanization.
Note: The influence of temperature of hot dip galvanization to commodity function should think when select material.
2. outside state
Before immerge zinc fluid, fastener appearance should be clean, ought not to have any contaminant. Otherwise, affect the action of galvanization.

2, program of hot dip galvanization and precautionary measures
1. eliminates stress
To the fastener that main circumstance applies, before pickling and hot dip galvanization, can request to eliminate stress first.
2. appearance clears
The spare parts should undertake outside Qing Dynasty first. In outside and clean process, the hydrogen when pickling perhaps is absorbed basically by steel. Not complete perhaps fuse goes to hydrogen in zincic fluid, perhaps bring about hydrogenous fragile craze consequently. Unless still have an agreement, the spare parts that heat treatment or the hardness that machine sclerosis are more than or is equal to 320HV should choose joint defence to corrode acerbity, alkalescent or mechanical method to undertake cleanness. The hour in acid of immerge anticorrosion acid etching depends on bear the condition that appearance can contain and most continuously always.
Note: Suitable anticorrosive sick at heart can reduce pair of steel corrode and of hydrogen adherent.

3. drying
If undertake stoving, answer to apply before outside activation is handled.
4. dissolvent is handled (aid plating)
The spare parts should undertake outside activation is handled, should undertake when necessary as dry as a chip.
 

5. heats up dip galvanization
The plating that heats up dip galvanization to be ℃ of 455 ℃ ~480 in temperature normally undertakes inside groove. Lubricate to obtain and thinner zincic layer can choose galvanization of tall tepid dip. The plating that high temperature heats up dip galvanization to be ℃ of 530 ℃ ~560 in temperature normally undertakes inside groove, taking appearance is lacklustre normally. To avoid to produce tiny flaw, the standard reachs its above in M27, the bolt of 10.9 class, bolt mixes functional grade snail column, unfavorable choose skill of high temperature galvanization. The plating that should avoid to be ℃ of 480 ℃ ~530 in temperature undertakes heating up dip galvanization in groove.

6. is centrifugal with refrigeration
Take out the part from inside plating chamfer should undertake centrifugal processing instantly, be next in water or air is cool (conclude by standard large and small) .

7. requests to the special skill of nut
Nut whorl or other inside whorl spare parts should undertake tap after hot dip galvanization, do not allow to repeat tap.
8. aftertreatment
Great majority of spare parts of hot dip galvanization does not request an aftertreatment. When the client requests, perhaps apply the aftertreatment skill such as chromate, phosphate, white rust happens in order to use up when perhaps the ground avoids wet environment to store (white is corroded) or the spray working procedure after be helpful for plating.