The antirust knowledge of hardware tool

The metal in hardware product, the first issue on custodial job is anticorrosion. Because,corrosion of metals is all round the chemical effect of medium or electrochemistry effect cause. Press medium different, cent is corroded for atmospheric corrosion t, soil, seawater is corroded, the bacterium is corroded etc. Meantime atmospheric corrosion t is pervade, because metal is in without giving thought to treatment, carry and store in custodial process, feel with atmosphere, time has the requirement of fit atmospheric corrosion t.

In customarily, because be caused by oxygen, moisture and other pollution impurity,be in to the metal in atmosphere corrode or become angry, call rusty or rustily. After metal is rusty, light person influence exterior quality, a serious effect apply, and even form become invalid, so metal is keeping in, sure want appropriate to keep, advertent and antirust.

Make the chief essential factor with rusty metal

1) atmosphere relative humidity
Below identical temperature, the per cent of atmospheric vapor content and content of its vapor saturation, be called relative humidity. It is under some relative humidity, the metal is rustily rate is very minor, and prep above after this one relative humidity, rustily speed is added abruptly. This one relative humidity calls critical humidity. The critical humidity of a lot of metals is in 50% , 80% between, iron and steel is about 75% . The impact with atmosphere rustily to the metal relative humidity is big. When atmosphere humidity prep above after critical humidity, metallic appearance presents water film or drip, if atmosphere is medium contained harmful impurity is deliquescent earthy water film, drip, become electrolyte namely, aggravating and rustily.

2) air temperature and humidity
Air temperature and humidity are both and associated influence metal is rustily. This has a few more the following first state: The first, atmospheric vapor content, increase along with air temperature and increase; The 2nd, air temperature is high promote rustily accentuation, it is especially in damp environment, air temperature is higher, rustily rate is rapidder. When relative humidity is low, temperature is returned to rustily influence not quite showing, but in prep above when critical humidity, follow air temperature to increase, rustily quantity increases quickly. Other, if there is difference in temperature between atmosphere and metal, form condenser water in the metallic appearance with low temperature, also cause a metal to rust.

3) caustic gas
Pollute the caustic gas in air, affect to corrosion of metals with 2 oxidation sulfur big, the harm that reachs its alloy to steel, copper especially blame very. Sulfur of the 2 oxidation in atmosphere is principal originate of coal burn. In the meantime, burn product carbon dioxide also has corrode the effect. Mordant gas is mixed in the air all round the factory. If gas of vulcanization hydrogen, ammonia, hydrochloric acid is enraged,etc is the element with stimulative rustily metal.
The quantity increases quickly. Other, if there is difference in temperature between atmosphere and metal, form condenser water in the metallic appearance with low temperature, also cause a metal to rust.

4) other essential factor
A lot of dust are contained in atmosphere, wait like grain of aerosol, coal ash, chloride and other acid, alkaline, salt, some itself are had caustic, or of drip condense nucleus, also be rustily element, the '' deadly enemy that if chloride is considered as,corrodes a metal " .
Antirust method of the metal
Antirust method is rustily to the metal reason adopts precautionary measure. Already the metal is rustily because the element such as sulfur of damp, high temperature, oxygen, 2 oxidation, chloride, dust is formed,be, prevent the metal that rust is about to avoid or these element place cause slow down so rustily effect.

The antirust method that chooses now has: Certain element is added when the metal takes exercise, raise a metal to defend the ability that exterior medium corrodes; Undertake to metal anti-corrosive outside processing, make form appearance to change a layer or add make outside cladding; Cathode is safeguarded, although use corrosion inhibiter of antirust, gas phase, can pare plastic, sealed wait for a method to make metallic appearance and outside ambient cut off temporarily (belong to provisionality antirust method, when metal is applied also can smooth get rid of these antirust data. Of this kind of method antirust period can amount to a few months to arrive a few years, applied contrast pervades.
Hardware product is custodial normally criterion

1 choose suitable custodial situation
The circumstance of metallic data check, no matter all should be cleaned outside Kuneiku,work hold, be far from fit the factory workshop of harmful gas and dust, not with acerbity, alkaline, salt kind reach the material such as gas, powder jumbly check, want classification to establish a point, group by group check; Different when Jian of phyletic metallic parts of an apparatus is put in same place, need to have the removed interval that showing, avoid fit feeling to corrode. Heat up steel rolling material to wait to be able to stock shed or add cover with a straw mat to fill up normally; All magnesium alloy, small-sized rolled steel, thin plate, metal strip, careful parts of an apparatus, metal and nonferrous metal data answer inside library of check stored in a barn, conditional can send existence special warehouse.

2 hold to storehouse as dry as a chip
Ensure storehouse relative humidity is under critical humidity, should be in relative humidity control normally 70% order about. Manage the temperature and humidity of good storehouse, hold weather change at any time, avoid hurricane, rainstorm to invade, use ventilated method to drop in temperature, fall wet. As dry as a chip agent is placed to also can rise inside the library fall wet effect. Hold to storehouse as dry as a chip it is to assure hardware of put in storage to the product avoids or ease rustily fundamental condition.

3 appropriate code battlementses, cover with a straw mat is filled up and sealed
Appropriate code battlements and mat of cover with a straw mat also are hardware product one of moistureproof, link that prevent damage. The request that pile up a battlements accomplishs reasonable, firm, mensurable, neat, economic storehouse. Sealed make metallic data and outside air cut off, cut down humidity to be opposite rustily influence. By sealed saved metallic data, must be in sealed before had not sufferred tide, and quality is without what be short of.

Law of 4 fuel injection is antirust
Be in south damp and broiling area, the metallic parts of an apparatus of outdoor check, just choose lid of cover with a straw mat to return the antirust intent that short of anticipates, can at the same time again fuel injection is antirust, but the person that build the unfavorable fuel injection such as reinforcing steel bar and the rolled steel that need cold breast, cold-drawing again, cannot choose this magic art.

5 safeguard parts of an apparatus defend the layer is mixed pack
Rust to avoid metal, antirust processing has been made normally when leaving factory, if chemical processing is generated,defend antirust of Fu of film, besmear or antirust pack etc. In move, assemble and unassemble and store in waiting for an operation, need to prevent damage antirust and outer and pack, not endamage, be out of shape by injury, press press. Pack the person that damage to should give amend or replace, be affected with damp be affected with damp person should adopt as dry as a chip processing, smudgy or antirust oil is sere person should get rid of from the beginning oiled.

6 hold to storehouse and parts of an apparatus to clean, strengthen examine a system, discover the problem is handled in time
During hardware product is keeping, should fulfill examine a system, undertake daily, time examine with what do not time, so that discover a problem in time, handle in time. All sorts of antirust method of hardware product can have delay corrode effect only, keep consequently due and sure time limit, should follow the standard that first-in first-out, rotate delivers goods.




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