Time filter

Source Type

Hino M.,Industrial Technology Center Of Okayama Prefecture | Murakami K.,Industrial Technology Center Of Okayama Prefecture | Saijo A.,Hori Metal Finishing Industry | Hikino S.,Okayama University of Science | And 2 more authors.
Materials Transactions | Year: 2011

This study examined the possibility of surface heat treatment by the plasma electrolysis from phosphate electrolytic solution on magnesium alloys. Effects of the anodic plasma electrolysis onto various AZ series magnesium alloys on the mechanical properties and microstructure were examined. The tensile test revealed that the anodic electrolytic treatment at final bias voltage from 250V to 400V influenced the tensile strength. The tensile strength of AZ61 and AZ91D substrate after anodic electrolytic treatment increased or decreased, and this change of tensile strength is attributable to the precipitation of intermetallic compound (β phase, Mg 17Al 12) as sparks occurred due to dielectric breakdown during anodic electrolysis. These results demonstrate the utility of this electrolytic treatment on AZ61 and AZ91D magnesium alloys. © 2011 The Japan Society for Heat Treatment.


Kanadani T.,Okayama University of Science | Hikino S.,Okayama University of Science | Saijo A.,Hori Metal Finishing Industry | Hino M.,Industrial Technology Center Of Okayama Prefecture | And 2 more authors.
Materials Science Forum | Year: 2010

Magnesium alloys possess many advantageous functional properties. Use of magnesium alloys, mainly for vehicle parts as well as electronic appliances, has been booming in recent years because of their lightweight compared to aluminum alloys and good creep resistance relative to plastics. Most the use of magnesium for structural applications has been die-cast components and most of this in one alloy, AZ91D. Since magnesium has the lowest electrochemical potential out of all the common commercial metals and is extremely prone to corrosion, it is necessary that it undergoes surface treatment. It is well known that fatigue cracks start near the free surface. Surface microstructure, therefore, should have a significant effect on the fatigue strength. This study was carried out using a mainly phosphate solution without heavy metal onto various AZ magnesium alloys. The effect of anodizing on mechanical properties and microstructure was examined by repeated tension fatigue tests, tensile tests, hardness tests and electron microscopy. © (2010) Trans Tech Publications.


Murakami K.,Industrial Technology Research Institute of Okayama Prefectural Government | Hino M.,Industrial Technology Research Institute of Okayama Prefectural Government | Saijo A.,Hori Metal Finishing Industry | Kanadani T.,Okayama University of Science
Materials Science Forum | Year: 2010

Corrosion protection by anodization and conversion treatment in phosphate solution was studied by microstructural and electrochemical analysis. Both the anodized and the conversion-treated layers showed sacrificial protection in a solution of sodium chloride. The corrosion current or the dissolving rate of the anodized layer was smaller than that of the conversion-treated surface. The modified layers had another mode of protection to form protective films on magnesium substrate where the original modified layers were mechanically lost. Since the state of magnesium in the anodized layer is close to magnesium oxide, phosphorus in the layer is considered to have an important role in these properties concerning the above corrosion protection. © (2010) Trans Tech Publications.


Hino M.,Industrial Technology Center Of Okayama Prefecture | Murakami K.,Industrial Technology Center Of Okayama Prefecture | Saijo A.,Hori Metal Finishing Industry | Hikino S.,Hori Metal Finishing Industry | And 2 more authors.
Materials Transactions | Year: 2011

The effects of various surface treatments on the friction and wear properties of AZ91D magnesium alloy substrate against the SUJ2 steel ball were evaluated by using a horizontal reciprocating friction and wear test apparatus. The friction and wear properties greatly changed due to the type of surface treatment in spite of being under equal friction and wear testing conditions. Wear loss of AZ91D magnesium alloy anodized from the phosphate solution was greatly reduced in comparison with the other surface treatment such as Dow17, conversion coatings and also no surface treatment. The above results suggest that anodizing from the phosphate solution should improve the friction and wear properties of magnesium alloy used for sliding parts. © 2011 The Japan Institute of Metals.


Hino M.,Industrial Technology Center Of Okayama Prefecture | Murakami K.,Industrial Technology Center Of Okayama Prefecture | Saijo A.,Hori Metal Finishing Industry | Hikino S.,Okayama University of Science | Kanadani T.,Okayama University of Science
Keikinzoku/Journal of Japan Institute of Light Metals | Year: 2010

The effects of various surface treatments on the friction and wear properties of AZ91D magnesium alloy substrate against the SUJ2 steel ball were evaluated by using a horizontal reciprocating friction and wear test apparatus. The friction and wear properties greatly changed due to the type of surface treatment in spite of being under equal friction and wear testing conditions. Wear loss of AZ91D magnesium alloy anodized from the phosphate solution was greatly reduced in comparison with the other surface treatments such as Dow17, conversion coatings and also no surface treatment. The above results suggest that anodizing from the phosphate solution should improve the friction and wear properties of magnesium alloy used for sliding parts.


Trademark
Hori Metal Finishing Industry | Date: 2015-11-02

Sushi.


Murakami K.,Industrial Technology Center Of Okayama Prefecture | Hori T.,Hori Metal Finishing Industry | Kanadani T.,Okayama University of Science
Materials Transactions | Year: 2014

The effects of two different pretreatments on the anticorrosive performance of AZX911 magnesium alloy containing 1.0 mass% calcium treated with an anodizing from phosphate and ammonium salt solution have been studied. The AZX911 magnesium alloy after anodizing had a lower anticorrosive performance. The lowering of this anticorrosive performance was attributed to the 0.1 mass% calcium in the anodized coating. The anticorrosive performance of the AZX911 magnesium alloy was improved by applying a fluoride salt solution in the pretreatment. This fluoride salt solution treatment made it possible to remove calcium close to the surface of the AZX911 magnesium alloy substrate, the calcium content in an anodized coating being decreased. The anticorrosive performance was improved by the anodizing from phosphate and ammonium salt solution with a sacrificial anticorrosive effect. ©2014 The Japan Institute of Metals and Materials.

Loading Hori Metal Finishing Industry collaborators
Loading Hori Metal Finishing Industry collaborators