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How to prevent mgo board corrode steel?

Views:460     Author:Site Editor     Publish Time: 2016-06-28      Origin:Site

Magnesium board has been widely use as building elements in different countries. It has great physical performance and A1 fireproof.But in recently there are lots of negative information about mgo board on internet,many user afriad & confuse about it.Rockmax has been research and develop chloride mgo board for long time.Here is some information for share.


What is mgo  board?

Magnesium oxide board or "mgo board" in short.

it is kind of artificial crystal, similiar to concrete cement(limestone and water)

Magnesium cement  is synthesize by there elements: oxide , salt and water.

Magnesite stone-magnesium oxide

Salt-such as magnesium chloride or magnesium sulfate 

Water


Why mgo board corrode steel ?


Magnesium cement has 2 kind, magnesium sulfate board and magnesium chloride board

only magnesium chloride board release chloride.

Most of Chinese producer do not have mature technical to produce magnesium sulfate board,

and export magnesium chloride board,ruin its name.


How does magnesium chloride board corrode steel?


Metallic corrosion is the process of either stealing or donating electrons, when the electrons are stolen or donated, the metal atoms will dissolve in the water. Salt water is a the main conductor, so the rate of corrosion increases dramatically. When mgo board in high humidty enviroment,8-15% free chloride iron will dissolve and move toward water,when it contact with metal,unavoidale corrosion will happen on its surface. 


How to provent magnesium chloride board corrode steel?

3 options

1-Use stainess screw and stainess frame or aluminmium frame. 

2-Laminate a plastic film on the surface that next to the frame

3-Dismantle magnesium chlrodie board from steel frame system.


What would be happen if you use magnesium chloride board with steel frame or galvanized steel frame?

1-screws and frame affect by chloride ions and get rust

2-panel get damp in rainy days and plaster drop

3-panel get powery after soak and dry

4-bend or crack at the joint after few months


How to confirm the mgo board that contains chloride?

2 options

1-Pour a cup of purified water,then immerse some fine screw into the water.Check changes.

2-Contact local lab,such as SGS, for a chloride content test,cost about $300-400. It takes only 7-10 working days.


Some cases about magnesium chloride board corrode steel

Number 1

A piece of mgo board fasten on frame by dacro treament screw.After that put in indoor,

after 6 month,all the screw get rust and there are plenty of powder,which is magnesium chloride came out.

IMG_3957 IMG_3956

Number 2

Magnesium chloride board 15mm-18mm  for ventlating duct application.It corrode steel and damp badly.

magnesium chloride absorb moisture from air.

ventlate duct made of mgo
IMG_4394
screw piont

Number 3

Exterior cover case,about 4 year.corrode frame badly,frame system destroyed.screw lose strengh,panel fall off. 

magnesium oxide board corrode steel2.jpg

magnesium board corrode steel.jpg

Mgo board corrode steel1.jpg

Mgo board corrode steel.jpg

The best way to solve this problem is use chlorde free mgo board.

Rockmax Safeboard,is a new generation formula product

which does not contain chloride,tested under ASTM C871

we provide test report to clients ,we compensate 200% for panel buy from us,that contains chloride.


We appeal all the mgo board distributors and end user stop use magnesium chloride board(contains chloride) in

steel frame system or other building elements. 


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