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Some of the questions will still be left unanswered to you. So here we have tried providing you with the answers to these unanswered questions related to the hot dip galvanization.
Following is a list of FAQs:
How steel can be protected from corrosion using Hot Dip Galvanization (HDG)?
Zinc used in HDG process acts as an envelope for the steel and keeps the corrosive elements in the environment out of the way of steel. Zinc acts as a corrosion protection system. It doesn’t permit moisture and other corrosive elements to assail the steel and corrode till its total consumption before the steel.
What is the life time of galvanized steel?
The steel underwent HDG process is long-lived. The galvanized steel lasts for more than 75 years, sustaining almost all types of environment and conditions.
Is zinc coating of galvanized steel resistant to abrasion?
During HDG process there are three metallic layers formed above the steel construction. These layers are tough and harder than the base metal (steel) and have a top-drawer resistance to abrasion. This also nullifies the remedial measures to be taken while handling large and heavy steel segments.
Is HDG process cost-effective than paint systems?
In terms of cost effectiveness the initially both HDG and paint systems are comparable. But life-cycle costs of HDG are always lower than that of the paint systems because of HDG gives many years of zero maintenance and paint systems requiring constant maintenance. Thus, HDG is a smart choice.
Can hot dipped galvanized steel defy high temperatures for long durations?
Hot dipped galvanized steel can withstand temperatures up to 200oC and at times more than this. The perfect environment for hot dipped galvanized steel should have temperatures below 200oC. Under temperatures above 200oC good performance can be achieved.
Can you paint over galvanized steel products?
A layer of paint over the zinc coating results in a corrosion protection system of double strength as compared to both the systems individually. Combination of paint and zinc, also called as duplex coating, widens the life time of the zinc coating.
For how long the steel can be protected from corrosion if galvanized?
How long the zinc coating will defend the corrosion depends upon the thickness of the zinc coating and the aggressiveness of the corrosive elements in the environment. In such an environment where there is less exposure to elements like harmful emissions, galvanized steel can last for an average of 125 years. While as under environment of chlorides and sulphides, the galvanized steel may last for an average of 75 years.
Are there any limitations on the size of the steel to be galvanized?
No, there are no such limitations. Steel of differing shapes and sizes can be galvanized. Galvanizing kettles of varying dimensions accommodate steel of different sizes for galvanization.
Why sometimes the zinc coatings of galvanized steel differ in appearance?
The appearance of the zinc layer of galvanized steel differs depending upon amount of zinc used during HDG process. If pure zinc is used in the coating, the appearance will be bright otherwise it will appear dull. But the appearance of the zinc envelope doesn’t affect the protection properties of the zinc coating.
How long does it take to galvanize steel?
The time it takes to galvanize steel varies depending on the demand of the same and what time the demand is there. Approximate lead time for HDG is half a day which leads to the processing of small and pressing orders within one or two days.
What are the environmental hazards that occur when zinc layer sacrifices itself or corrodes away?
Apart from being a naturally occurring element, zinc is an essential element for the survival of all beings. There are no known harmful effects of the zinc products after corrosion. But zinc plays an essential role in our daily diet, reproduction, cosmetics, drugs and it is good for soil as well.
Should any forethought be exercised when galvanised steel comes in contact with other metals?
Yes, care should be taken to insulate galvanised steel in order to prevent its direct contact with other dissimilar metals. Insulation can be provided with the assistance of non-conductive materials like rubber or plastic.