Corrosion Properties of New Magnesium Alloys

Hawke, David; Olsen, Asbjørn

doi:10.4271/930751

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…Studies [12,[17][18][19][20] have confirmed that the most critical factor in the corrosion behaviour of Mg and Mg alloys is the metal purity. Iron, nickel, and copper are extremely deleterious because they have low solid-solubility limits and provide active cathodic sites which lead to galvanic corrosion and increase corrosion rates.…”

Section: Impurity Elementsmentioning

confidence: 99%

“…The deleterious effect of iron in pure magnesium is shown in Fig. 3, and it is suspected to be due to the galvanic coupling between the magnesium matrix and the iron particles scattered in the matrix because Fe has a very low solid solubility in magnesium (about 9.9 ppm) [13], while Hawke and Olsen [18] thought that in the absence of Mn, virtually all the Fe precipitates in magnesium alloys as FeAl 3 which has a high cathodic activity for corrosion, as shown in Fig. 4.…”

Section: Ironmentioning

confidence: 99%

“…A small amount of copper has a beneficial effect on the creep strength of magnesium die castings, but strongly accelerates salt water corrosion [113]. Cu is less harmful than iron in magnesium, because copper precipitates in magnesium as Mg 2 Cu which has a lower potential than FeAl 3 [18]. Mg 2 Cu acts as an effective cathode, catalyzing the hydrogen evolution.…”

Section: Coppermentioning

confidence: 99%

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Corrosion and Surface Treatment of Magnesium Alloys

Hu¹,

Nie²,

Ma³

2014

Magnesium Alloys - Properties in Solid and Liquid States

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The need for fuel efficiency and increased performance in transportation systems continually places new demands on the materials used. The design criteria which automobile and aerospace industries are primarily concerned with are density, strength, stiffness, and corrosion resistance. Low-density materials may reduce fuel costs, increase range, and allow larger payloads. High strength and stiffness are necessary for adequate performance and safety characteristics, while corrosion resistance helps to ensure that design lifetime is achieved.Magnesium is the th most abundant element on the earth making up approximately . % by mass of the earth s crust and . % by mass of the oceans [ ]. Other advantages of magnesium alloys have played an important role in a broad variety of structural applications in the automobile, aerospace, electronics, and consumer products industries. Magnesium has specific high strength to weight ratio, and it is % lighter than aluminium and % lighter than iron. Typical magnesium alloys weigh ~ % less than their aluminium counterparts at equal stiffness. Magnesium also has high thermal conductivity, good electromagnetic shielding characteristics, good ductility, excellent castability and better damping characteristics than aluminum, and Mg is easily recycled. The main use of magnesium by far is as an alloying addition to aluminum alloys. Other major uses of magnesium include desulphurization of steel and the production of ductile iron. "s a structural material, it can be used in aerospace components, automobile and computer parts, mobile phones and sporting goods. Magnesium for structural applications is processed into castings die, sand, permanent mold and investment , extrusions, forgings, impact extrusions and flat rolled products. Die castings account for % of the castings shipped. Magnesium can be joined by riveting, or any of the commonly used welding methods [ ].With the dramatically increased emphasis on weight reduction, magnesium is receiving a lot of attention as a material for use in the next generation automobiles. This is due to limited fossil

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Section: Impurity Elementsmentioning

confidence: 99%

Section: Ironmentioning

confidence: 99%

Section: Coppermentioning

confidence: 99%

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Corrosion and Surface Treatment of Magnesium Alloys

Hu¹,

Nie²,

Ma³

2014

Magnesium Alloys - Properties in Solid and Liquid States

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“…The corrosion behavior of these alloys is reviewed. The exacting problem of galvanic compatibility of magnesium, especially with ferrous metal fasteners, is discussed and approaches to the solution are evaluated [22].…”

Section: Corrosion Properties Of New Magnesium Alloysmentioning

confidence: 99%

Corrosion issues in electronic equipments – an overview

2019

Int. J. Corros. Scale Inhib.

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Corrosion-induced failures are frequent in electronics products used in industrial environments. Now even in environments previously considered relatively benign with regard to electronics, serious corrosion problems are experienced as a direct result of RoHS (Restriction of the use of certain Hazardous Substances in electrical and electronic equipment) compliance. The very often used metals and alloys in electronic devices include aluminum, gold, copper, silver, tin, lead and their alloys. In electronic circuits the metals and alloys undergo various corrosion processes such as atmospheric corrosion, galvanic corrosion, electrolytic migration and fretting corrosion. Electronic products plays an un-replaceable role in recent society. But an increase in the number of people in the world having health problems caused by electromagnetic radiation pollution. Data obtained from sensors are useful in controlling corrosion of concrete. Climate changes which increase the levels of relative humidity and temperature, and thus causes corrosion in the industry and generates economic losses, which reduces competitiveness in the electronics industry in any region. Electroplated zinc finishes have been connected with the electronics industry for numerous years as a result of their outstanding corrosion resistance and moderately low cost. They are normally applied onto ferrous products to make available corrosion protection in a range of different environments. However, the formation of spontaneously grown whiskers on zinc-electroplated components, which are capable of resulting in electrical shorting or other destructive effects, can be highly challenging for the reliability of long life electrical and electronic equipment. The corrosion product creeps onto the solder mask surface and causes short circuits between the adjacent pads and traces. Creep corrosion of electronic assemblies is a growing problem. Commonly seen in harsh environments, the failures result from the formation of copper sulfide films on Printed Circuit Board assemblies in short period of time. Electronic control apparatus has been used for several decades to control processes and improve yields in the pulp and paper industry. Many electronic equipment manufacturers have changed from lead connections can fail rapidly in mild and moderate environments, beforehand thought to cause troubles only after long periods of time.

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“…In fact, the general corrosion rate of A380 aluminum is higher than that of AZ91D magnesium alloy. 5 To insure that this low general corrosion rate is maintained, it is critical that the contaminant levels be closely monitored. Of the three elements indicated, the most likely to experience an increase during the die-casting process is iron.…”

Section: Introductionmentioning

confidence: 99%