collection | supposes home 简体中文  chinese
home about us structure products warehouse
     return to directory
zinc-alu-mg alloy coated steel sheet
·introduction
·charateristics
charateristicsd
excellent scratch resistance
welding characteristics
painting
zg no special treatment of organic chromium
·specifications
volume of coating adhesion
coating thickness
mechanical properties
·scope of manufacturing
·some application examples
electrical machinery industry
power industry
automotive industry
civil engineering industry
agriculture and animal husbandry
you now position: home >> product
  introduction  

galvanized steel sheet of aluminum-magnesium alloy coating by zinc (zn), aluminum (al) 6%, magnesium (mg) 3% to form high-temperature curing. its structure by zn, al and zn2mg the dense structure constitutes a total of three, so that the steel surface to form a layer of compact and effective to prevent corrosion factor through the barrier.

al-mg coatings of galvanized steel plate interface map       
   
  charateristics  
 

1、corrosion resistance
al-mg galvanized steel sheet with excellent corrosion resistance, hot dip galvanized steel sheet is 10 to 20 times, is the hot-dip galvanized aluminum (5%) alloy steel plates 5 to 8 times.
1.'s corrosion resistance mechanism

(1) the surface of the corrosion resistance mechanism
① mechanism to protect film
hot-dip galvanized steel surface can form a protective coating. however, the thick coating layer, water and oxygen, such as corrosion protection factor easily through the membrane resulting from corrosion. al-mg galvanized steel plate because the coating of aluminum and magnesium components, with the passage of time, in the coating on the surface attached to generate highly dense coating to protect and to effectively prevent corrosion, through the factor, corrosion resistance to achieve stability .

②and a variety of flat steel coating part of the corrosion resistance compared with
in the salt spray test (sst: jis z2371) under the red rust occurred. al-mg galvanized steel sheet and hot-dip galvanized steel, hot dip galvanized - 5% aluminum-alloy steel plate, has excellent rust-resistant red.

③ammonia-resistant

al-mg-resistant galvanized steel sheet of ammonia and other hot-dip galvanized steel sheet and hot-dip aluminum (55%) - zinc alloy plate (galvaster) even more outstanding.
 
 

sample

 

coating type

volume of coating adhesion

material

post-processing

al-mg-zn

zn-6%al-3%mg

90g / ㎡ (single)

low-carbon steel

no

hot-dip galvanized

zn

90g / ㎡ (single)

low-carbon steel

no

hot dip 55% aluminum - zinc alloy

55%al-zn

80g / ㎡ (single)

low-carbon steel

no

experimental conditions
22 degrees celsius in 5% ammonia in 24 hours after impregnation was determined to reduce corrosion. in addition, the trial process, the end of the specimen and seal the back of

 
  0h 120h 200h
al-mg-zn (zg deal) level
hot dip 55% aluminum - zinc alloy (dealing with organic coating) level
 

sample

 

coating type

volume of coating adhesion

material

rust-proof handle

al-mg-zn

zn-6%al-3%mg

90g / ㎡ (single)

low-carbon steel

zg deal: organic chromium-free special treatment(2 μ m)

hot dip 55% aluminum - zinc alloy

55%al-zn

90g / ㎡ (single)

low-carbon steel

dealing with organic coating(2 μ m, chromium element)

experimental conditions

ammonia concentration (ph)

test status

temperature

10% (ph125)

semi-impregnation (liquid, gas)

high temperature

④acid
al-mg galvanized steel in acidic and alkaline liquid water depth shown with the type of galvanized steel sheet the same effect of corrosion
 
 
sample
 

coating type

volume of coating adhesion

material

post-processing

al-mg-zn

zn-6%al-3%mg

90g / ㎡ (single)

low-carbon steel

no

hot dip 55% aluminum - zinc alloy

55%al-zn

80g / ㎡ (single)

low-carbon steel

no

hot-dip galvanized - 5% aluminum alloy

zn-5%al

90g / ㎡ (single)

low-carbon steel

no

hot-dip galvanized

zn

90g / ㎡ (single)

low-carbon steel

no

test method

solution: containing 1g / l aqueous solution of sodium sulfate as the basic solution, sulfuric acid is added, add alkaline naoh, so that ph values between 1-14 changes
each sample (n = 3) in the adjustment of 30 degrees celsius and maintain the ph of the impregnating solution for 24 hours, calculated to reduce corrosion. during the trial process, and the back end of the incision to seal

⑤ outdoor exposure test results
about 7 years of exposure results show that al-mg galvanized steel sheet hot-dip galvanized steel than the corrosion resistance of about 4 times as high. over time, al-mg galvanized steel plate than the other coating appears to reduce corrosion drop al-mg galvanized steel and other corrosion resistance coating steel sheet gap will further widen.
outdoor exposure test

 

exposure

coastal environment (about 30 meters away from the coast)

okinawa prefecture midtown village

pastoral environment

jun-ken kiryu city

al-mg-zn-dip galvanized steel sheet and finished product than in the sulfur dioxide (sulfurous acid gas) environment, show a more excellent corrosion resistance.

sulfur dioxide in the experimental al-mg-zn-dip galvanized and finished after the reduction of corrosion
 
sulfur dioxide test conditions
sulfur dioxide concentration: 100ppm
test temperature: 40°c
 

galvanized steel with aluminum-magnesium-dip galvanized after product compared to acid rain in the environment, show a more excellent corrosion resistance.

 
simulated acid rain conditions combined cycle corrosion test

first steps: spray

1hour 35 ℃ ph: 4
second steps: drying 4hour 50 ℃ relative humidity:30%
third steps: sub 3hour 50 ℃ relative humidity:38%

simulated acid rain combined cycle corrosion test in al-mg-zn-dip galvanized steel and finished products after the corrosion rate

 

 

corrosion rate

al-mg-zn

0.05g / ㎡ /cycle

dip galvanized after

0.35g / ㎡ /cycle

note: 500 times the average cycle

sample

categories

coating type

volume of coating adhesion

material

post-processing

al-mg-zn

zn-6%al-3%mg

90g / ㎡ (single)

low-carbon steel

no

dip galvanized after

zn

hdz55 560g / ㎡ (single)

low-carbon steel

no

   
  incision end of the corrosion resistance mechanism  
 
① end anti-corrosion mechanism
al-mg galvanized steel plate cut end of the four peripheral over time, the coating ingredients dissolution, the formation of zinc hydroxide 【zn (oh) 2】, alkaline zinc chloride 【zncl 24zn (oh) 2 and magnesium hydroxide】 【mg (oh) 2】 such as protection of the dense composition of the skin. these ingredients in the few months it will cover part of the incision face. this conductive coating to protect the low end of some of the obvious corrosion inhibiting effect.
 

②and a variety of flat steel coating part of the corrosion resistance compared with
  in the salt spray test (sst: jis z2371) under the red rust occurred. al-mg galvanized steel sheet and hot-dip galvanized steel, hot dip galvanized - 5% aluminum-alloy steel plate, has excellent rust-resistant red.

 
   
  bending conditions of salt spray rust red  
 

(3) bending of salt spray test (sst) of the occurrence of red rust
the following picture for the salt spray test 1t bending under the part of the occurrence of red rust. al-mg-galvanized steel corrosion as a result of excellent performance, the processing part of the red rust-resistant coating of steel more than any other good.

   
  bending in the appearance of changes in outdoor exposure  
 
(4) of bending under outdoor exposure test the appearance of change
the following picture for the bending part of the outdoor exposure test of the appearance of al-mg-galvanized steel plate in bending can also play a part other than the coating of steel excellent corrosion resistance.
   
  drawing part of cylinder corrosion resistance compared  
 

(5) part of the drawing cylinder corrosion resistance compared
(the results of corrosion test cycle)

   
  and comparison of stainless steel and aluminum sheet  
 

2, and comparison of stainless steel and aluminum sheet
stainless steel in its formation of dynamic membrane surface, has excellent corrosion resistance. but the disadvantage is that the "salt" weak. and the protection of galvanized steel sheet of aluminum-magnesium coating on the "salt" could also play a very strong effect of the barriers. "perforated-resistant" as the structure required the use of the "steel life", stainless steel is more excellent. however, as the use of panel surface when the "red rust-resistant," al-mg-galvanized steel sheet extremely excellent.
corrosion resistance of aluminum is very strong corrosion resistance, its surface is not achieved by the dynamic membrane. however, aluminum has the "base" of the nature of the weak.

   
  corrosion potential  
 

3 、corrosion potential

galvanized steel with aluminum-magnesium product after dipping (hdz) shows almost the same corrosion potential.

   
  excellent scratch resistance  
 

2.second, excellent scratch resistance of
as the galvanized steel coating of aluminum-magnesium than any other hot-dip galvanized steel sheet and hot-dip galvanized - aluminum plate is more rigid, more excellent scratch resistance, and could be applied to processing easily by scratches or repeated friction or wear and tear site.

   
  third, welding characteristics  
 

3.third, welding characteristics
al-mg-zinc galvanized steel plate with other types of steel, the coating susceptible to the effects of low-melting-point metal. in arc welding with hot-rolled, cold-rolled steel sheet as compared to prone to flying and the increase in porosity as well as cracks caused by the drop in intensity. however, if the conditions for selecting appropriate welding seam to connect does not exist on the issue of strength. moreover, in welding in, as long as the selection of appropriate welding conditions, intensity-ho, no problem. in addition, the welding process, welding and joints will be affected by the effects of shape, etc., so please be confirmed through the welding test.

   
  electric arc welding  
 

1, electric arc welding

(1) machine: you can use the market to carry out any kind of welding machine. machine manufacturers have been developed to reduce the frequency welding spatter-controlled machine, the proper use of these devices can improve the welding environment.

(2) electrode: applicable to ordinary low-carbon steel and structural steel welding rod. generated in order to improve the welding spatter, porosity and pits, please use the use of zinc to the development of the electrode.

(3) shielding gas: can be used in the provisions of jis k1106 carbon dioxide 3. (if the pulse current and ar +20% co2 gas used in combination, it is possible to further reduce welding spatter at the time of the phenomenon.)

(4) welding current, voltage: in the same welding speed and hot-rolled, cold-rolled steel plate for welding, and hot-rolled, cold-rolled steel sheet as compared to coating due to evaporation would result in the consumption of calories, it should be an appropriate increase of welding heat . (current increase of about 5 ~ 10%)

(5), welding speed: when pores, pits and other defects, set lower than the hot-rolled, cold-rolled steel plate welding speed. welding process, one side so that the steam arising from the melting of zinc released from the pond surface, side of operation, will achieve excellent solder road.

(6) gap settings: before taking welding angle, they tend to have a porosity, weld defects such as pits. as to prevent the measures set in the inter-plate gap is the most effective way. if the installation of more than 0.6mm of space, could be substantially reduced by defects.
   

2 、spot

   
  paint repair  
 

1, paint repair (solvent type): for the welding part and end part of the incision repair, recommend the use of zinc - aluminum type paint.

   
  after the painting of  
 

2, after the painting: the galvanized steel plate with other al-mg coatings to paint the same plate. in addition, if requested after the painting has a long-term durability, it is recommended that before painting the pretreatment shown in the following table.

   
  zg special treatment of organic chromium-free galvanized steel plate al-mg  
 

zg special treatment of organic chromium-free galvanized steel plate is aluminum-magnesium organic coating processing, its characteristics are as follows:

1, environmental protection: because it is a completely non-chromate coating of a special coating products.

2, good corrosion resistance: the role of skin as a result of organic, with the ordinary and traditional chromate treatment of equal or higher corrosion resistance.

3, self-repair: the role of skin as a result of organic, conventional chromate treatment with the same or more self-repair.

4, superior processing: as the role of the organic coating with a chromate treatment than the traditional materials of superior processing.

5, lubrication: the role of skin as a result of organic, low coefficient of friction with the material than conventional chromate treatment of superior lubrication.

6, fingerprint-resistant: the role of skin as a result of organic, with more than conventional chromate treatment of excellent fingerprint resistance.

 
   
  product specifications  
 
1、the volume of coating adhesion
symbols attached to the volume of k06° k08 k10 k12 k14 k18 k20 k22 k25 k27 k35° k45°
an average of 3:00 on both sides attached to the volume of the smallest
(g/m2)
60 80 100 120 140 180 200 220 250 275 350 450
attached to both sides of the smallest volume of 1:00
(g/m2)
51 68 85 102 119 153 170 187 213 234 298 383
   
 
2、coating thickness
symbol tag attached to the volume of k06 k08 k10 k12 k14 k18 k20 k22 k25 k27 k35° k45°
coating thickness (both sides combined) 0.015 0.020 0.025

0.031

0.034 0.041 0.048 0.051 0.059 0.064 0.076 0.094
 
symbol tag attached to the volume of 45 60 - - 90 120 - 150 - 190 - 300
coating thickness (both sides combined) 0.015 0.020 -

-

0.030 0.040 - 0.050 - 0.063 - 0.100
   
 
3、mechanical properties
  the scope of manufacturing  
 
  electrical machinery industry  
  power industry  
  automotive industry  
  civil engineering industry  
  agriculture and animal husbandry  
 partner
company | contact us

copyright 2002-2008 milendra.com all rights reserved.
3/f, haichangxuan,haijing garden,no.21t,hai 6thrd., chuicheng,nanhai, foshan,guangdong province pr.china
tel:0757-86250881~0887   0757-86250760~0768 fax:0757-86250880 zipcode:528200