JPS649128B2 - - Google Patents
Info
- Publication number
- JPS649128B2 JPS649128B2 JP13738482A JP13738482A JPS649128B2 JP S649128 B2 JPS649128 B2 JP S649128B2 JP 13738482 A JP13738482 A JP 13738482A JP 13738482 A JP13738482 A JP 13738482A JP S649128 B2 JPS649128 B2 JP S649128B2
- Authority
- JP
- Japan
- Prior art keywords
- water glass
- acid
- die
- defects
- sio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 235000019353 potassium silicate Nutrition 0.000 claims description 58
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 56
- 230000007547 defect Effects 0.000 claims description 30
- 239000002253 acid Substances 0.000 claims description 29
- 229910052782 aluminium Inorganic materials 0.000 claims description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 27
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 16
- 238000004512 die casting Methods 0.000 claims description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- 150000001340 alkali metals Chemical class 0.000 claims description 2
- 230000002950 deficient Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 21
- 238000005470 impregnation Methods 0.000 description 16
- 239000011734 sodium Substances 0.000 description 13
- 238000005266 casting Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 239000000565 sealant Substances 0.000 description 11
- 238000010306 acid treatment Methods 0.000 description 10
- 238000001879 gelation Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 238000001723 curing Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000004017 vitrification Methods 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- DJHGAFSJWGLOIV-UHFFFAOYSA-N Arsenic acid Chemical compound O[As](O)(O)=O DJHGAFSJWGLOIV-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229940000488 arsenic acid Drugs 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- 229940092714 benzenesulfonic acid Drugs 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- QFWPJPIVLCBXFJ-UHFFFAOYSA-N glymidine Chemical compound N1=CC(OCCOC)=CN=C1NS(=O)(=O)C1=CC=CC=C1 QFWPJPIVLCBXFJ-UHFFFAOYSA-N 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- QYHFIVBSNOWOCQ-UHFFFAOYSA-N selenic acid Chemical compound O[Se](O)(=O)=O QYHFIVBSNOWOCQ-UHFFFAOYSA-N 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Description
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The present invention relates to an improvement in a method for sealing defects that cause pressure leakage in aluminum die-cast parts by impregnation treatment. In general, the aluminum die-casting method is applied to the production of various machine parts by taking advantage of the high degree of freedom in product shape design, but in the case of machine parts that require pressure resistance, casting defects may occur. There is a problem. Casting defects are generally classified into internal defects and external defects, and it goes without saying that internal defects such as shrinkage cavities, blowholes, and porosity mainly have a negative effect on the pressure resistance of die-cast parts. By the way, the current trend in die casting is toward high-speed, high-pressure die-casting, which has been successful in producing large die-cast parts with high efficiency, but it is not suitable for applications that require pressure resistance and fluid tightness. When used, it was not free from the drawbacks of internal casting defects. Therefore, various efforts have been made to reduce such defects by devising die-casting technology, but even minute internal defects on the micron order or difficult to measure can cause pressure leaks, so die-casting technology This alone has not been enough to eradicate the cause of pressure leaks. An example of a die-cast part that requires the above-mentioned pressure resistance is the housing of a car compressor for automobile air conditioning.Especially in the front housing part, if the ring groove and oil through hole are machined after die-casting, these parts will be damaged. Internal defects in the casting are likely to be exposed in some areas, causing pressure leaks. That is,
In the above-mentioned housing, internal casting defects are difficult to form in areas near the surface or in thin-walled areas;
In other parts, oil or refrigerant gas inside the housing leaks out through the continuous hole-like defects, and the refrigerant gas is lost during use of the car compressor. Here, the size of internal defects in casting that cause leakage or not depends on its diameter and length, and whether or not the defect is enlarged close to the surface. It also depends on the presence or absence of surface defects, etc., so it cannot be determined unconditionally. Therefore, conventionally, the entire die-cast part has been subjected to the impregnation treatment described below. One of the conventional impregnation treatment methods uses water glass such as sodium silicate to impregnate the exposed casting defects on the surface of the die-cast part using either the dip method, the internal pressure method, or the vacuum-pressure method. The water glass was then impregnated into the inside of the water glass, and then the water glass was heat-treated to harden it mainly by vitrification, thereby achieving sealing. Here, properties required of the sealant include excellent sealing performance, oil resistance, water resistance, heat resistance, operability, and cost. For water glass to be used as a sealant, it is essential to heat it at 80°C for about 2 hours and then leave it for about 1 day to harden it, and the longer the curing time, the easier it is to use. It was one of the problems above. An even more serious problem is that during the hardening process or by the user of the die-cast parts, some of the water glass may blow out from the holes in the internal defects in the casting, resulting in it getting into the compressor, for example, and damaging the sliding parts. The problem was that the sealing performance deteriorated in some cases. Mainly because of these problems, organic sealants whose main components are resins such as phenol, polyester, or acrylic have emerged and are now mainstream. However, the biggest drawback of organic sealants is that they are 5 to 10 times more expensive than inorganic sealants, and they also have lower heat resistance than inorganic sealants. There is also the risk of pressure leaks when die-cast parts are used in applications where they are exposed to high temperatures. The present inventor fundamentally improved the situation in which water glass as an inorganic sealant could not be used for die-cast parts that required pressure resistance and fluid tightness due to the problem of blowing out. In addition, we conducted research and development to develop an impregnating sealing method that eliminates the conventional disadvantage of requiring a relatively long time for curing and allows the use of water glass, which is more cost-effective than organic sealants, for pressure-resistant die-cast parts. He discovered that various problems with conventional water glass could be fundamentally solved by hardening water glass by acid treatment, which had not been used at all, and filed a patent application.
The present inventor conducted further research and found that using water glass with a molar ratio of SiO 2 /M 2 O (where M is at least one kind of alkali metal) higher than that of commonly used water glass, exceeding 4 and below 5.1, resulted in the above-mentioned results. It was found that the various problems were solved more effectively and the sealing performance was significantly improved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to facilitate understanding of the present invention, the present invention and conventional methods will be described in detail below with reference to the drawings. 1 and 2 schematically show a cross section of an aluminum die-cast part 1 having casting defects. As mentioned above, the casting defects that cause pressure leaks are continuous defects between the inner and outer surfaces of the part, and the types of casting defects are internal defects such as shrinkage cavities and blowholes, and surface defects also contribute to pressure leaks. ing. Figures 1 and 2 show that the casting defects that are most likely to cause pressure leaks are large shrinkage cavities or blowholes in which sealant accumulates, and small blowholes, porosity, or surface cracks that are continuous to these. It shows what is going on. Hereinafter, for convenience of explanation, this will be referred to as a blowhole, and is indicated as "2" in the drawings. In addition, in the drawing,
â3â is impregnated sealant (hereinafter referred to as impregnation liquid)
It is. This impregnating solution 3 is applied using the conventional water glass method.
When heated to 80°C, a blowout 3' occurs as shown in Figure 2. It is believed that the cause of this is the generation of small vapor bubbles 4 in the impregnating liquid. On the other hand, in the case of an organic sealant, the blowout 3' can be prevented by using an anaerobic resin, but the sealing performance is poor and the cost is high. As mentioned above, in the conventional water glass curing method, heat treatment was performed at 80â for 2 to 3 hours and then left for 1 day.The curing (solidification) mechanism is based on the vitrification reaction. There is. Note that it is recognized that several months are required for the curing to be completely completed, and it can be said that the blowhole 2 is not sufficiently sealed while the vitrification reaction is progressing. On the other hand, the acid treatment of the present invention is characterized in that a water glass gelation reaction occurs and the reaction rate is high. Furthermore, the feature of the present invention is that the blowout 3' does not occur, and if the water glass is hardened by the gelation reaction, the blowout 3' that occurs in the conventional vitrification reaction can be practically completely eliminated. was completed. The results of the inventor's experiments indicate that the water glass is not completely solidified by the gelation reaction, and that there is no problem in preventing pressure leakage even if it is not completely solidified. Ta. Furthermore, since the gelation reaction has a higher reaction rate than the vitrification reaction, the acid treatment of the present invention causes the hardening of the water glass to proceed rapidly at the outlet of the blowhole 2, and the die-cast parts after the acid treatment It is considered that the blowout 3' is effectively prevented even when the device 1 is left unused or in use. Based on the above experimental results, the inventors of the present invention sought to find conditions for promoting the gelation reaction.
The influence of the SiO 2 /M 2 O molar ratio on the gelation reaction was further investigated. If M is sodium,
A small-diameter test tube is completely filled with water glasses with different SiO 2 /Na 2 O molar ratios, and then the water glass and acetic acid are brought into contact at the inlet of the test tube for 30 minutes or 2 hours, and water is released from the tip of the gelled water glass. The length was measured. This length is shown in FIG. 3 as the reaction length. In FIG. 3, the horizontal axis represents the SiO 2 /Na 2 O molar ratio of water glass, the vertical axis represents the reaction length (mm), and the black and white circles represent the contact times of 2 hours and 30 minutes, respectively. From Figure 3
It can be seen that the reaction length increases as the SiO 2 /Na 2 O molar ratio increases, and becomes almost constant above about 4.2. Therefore, in the present invention, the SiO 2 /M 2 O molar ratio is set to a value exceeding 4. Here, SiO 2 /M 2 O
If the molar ratio is less than 4, the effect of promoting the gelation reaction will be small, while if it exceeds 5.1, the water glass will become unstable as a liquid, making it difficult to impregnate defects in aluminum die-cast parts. Therefore, in the present invention, the SiO 2 /M 2 O molar ratio is limited as described above. Generally, in water glass
It is said that if the SiO 2 /Na 2 O molar ratio is outside the range of 2 to 4, it will not become water glass. When silica and water glass are sufficiently stirred and mixed for, for example, several hours to several tens of hours, colloidal silica can be dissolved. The present inventor discovered that water glass containing SiO 2 at a high concentration promotes the gelation reaction, and as described later, it is possible to impregnate and seal defects in aluminum die-cast parts with extremely high reliability. Completed the invention. Also, water glass
When the SiO 2 /M 2 O molar ratio exceeds 4, the viscosity of the water glass increases and the permeability to the defects described above decreases, so the amount of water (H 2 O), which is one component of the water glass, is adjusted. Alternatively, it is desirable to adopt a method such as adjusting the amount of filler added, which will be described later. Adjusting the viscosity by controlling the water content up to 70% provides in most cases a viscosity low enough for defect impregnation sealing of aluminum die-cast parts. In this case, the above reaction length is
Depending on the SiO 2 /M 2 O molar ratio, contact time with acid, etc.
It will change, but you will get enough value. In the present invention, aluminum die-cast parts are subjected to impregnation and sealing treatment, so it is undesirable if the aluminum is eroded by the acid reacted with water glass. Therefore, by taking advantage of the property of aluminum that is easily passivated and basically using an oxidizing acid, the purpose of impregnating and sealing can be achieved without practically damaging the aluminum die-cast parts. The inventor tested the corrosion loss of aluminum using hydrochloric acid, nitric acid, citric acid, formic acid, and acetic acid at a concentration of 2N, and oxalic acid at a concentration of 1N, and confirmed that there was almost no corrosion loss except for hydrochloric acid. did. In particular, organic acids showed good results. Furthermore, when the gelation of water glass was tested using the above-mentioned acids other than hydrochloric acid, sufficient gelation occurred when the amount of acid added was 0.5 to 1.0 ml per gram of the impregnating solution. Basically, any acid that does not corrode aluminum can be used in the present invention.
Examples are phosphoric acid, chloric acid, iodic acid, selenic acid, arsenic acid, boric acid, acetalic acid, benzenesulfonic acid. One or more of the above acids may be used in combination. In determining the amount of acid to be added, water glass is a polymer, and it is not realistic to define an accurate acid molar concentration. Furthermore, since the impregnating liquid contains water and the like in addition to water glass, it is not practical to determine the weight ratio of the acid added to the impregnating liquid. For the above reasons, the amount of acid added to a given impregnation liquid should be determined experimentally. Next, water glass basically has an alkali silicate salt as its main component, and the alkaline component is at least one of sodium, lithium, and potassium, particularly sodium as the alkaline component, and sodium as the acidic component. There is no restriction at all as long as it is a known water glass in which SiO 2 is used. Furthermore, the water glass may contain Fe 2 O 3 or other metal oxide fillers in a broad sense. Moreover, as water glass for impregnating and sealing treatment, there are commercially available water glasses containing shrinkage preventive agents and the like in addition to the above-mentioned fillers, and there is no problem even if the water glass contains this. Furthermore, the aluminum to be treated in the present invention is JIS standard, which is normally used for die casting.
-H-2212 series alloys are included, and it goes without saying that it is not limited to pure aluminum. Embodiments of the present invention will be described below. As already mentioned, the drawback of the conventional heat curing method for water glass is that the curing time is long, but this point can be fundamentally solved by the action of acid. The acid treatment time according to the present invention depends on the acid temperature, acid concentration, and type of acid, but is about 10 to 30 minutes when an industrially commonly used acid is used at room temperature. Moreover, there is no need to leave it alone. Examples of the acid treatment method include a method of immersing the aluminum die-cast part in an acid aqueous solution, an alcohol solution, or another solution, and a method of spraying an acid solution. Note that the impregnation of water glass and the acid treatment can be performed in the same container or in separate containers. Further, when immersing an aluminum die-cast part in an acid solution, the acid solution can be pressurized and heated to accelerate the curing reaction. In addition, if acid and water glass are mixed in advance, the water glass will harden instantly and will not be impregnated into the blowhole. Therefore, acid treatment should be performed after water glass is impregnated into the blowhole using a known method. is necessary. Note that when heating acid, the water in the water glass (bound water) will melt when the temperature reaches 100°C.
Temperatures close to 100°C must be avoided at all costs, as the gas is released all at once. Therefore, the temperature of the acid should be as low as possible below 100°C, e.g. 80°C.
â or less is desirable. As a pretreatment for the process of the invention, if necessary, the aluminum die-cast parts may be cleaned, degreased, deburred, masked, etc. to remove any sources of interference with water glass impregnation and acid treatment.
Additionally, the aluminum die-cast part can be first passivated and then impregnated with water glass, followed by acid treatment with the most desirable acid for hardening the water glass. Further, as a post-treatment, water washing and drying are performed to prevent acid from remaining on the surface of the aluminum die-cast part. If there is a steam generating facility, water washing can be performed using a steam jet, and the time required for subsequent drying can be significantly shortened. After the above-mentioned post-treatment, products such as car compressors are inspected for pressure leakage, and if any defective products are found, the impregnation and sealing treatment of the present invention is applied again. Hereinafter, an example of preventing pressure leakage and blow-out of aluminum die-cast parts will be described. A large number of aluminum test pieces with holes as shown in FIG. 4 were prepared. In the figure, D=4
The dimensions were set as mm, H=5 mm, and d=0.6 mm. The test piece was placed in a high-pressure steel impregnation container 10 shown in FIG. After charging, increase the pressure inside the container to 4 cm for 10 minutes.
The pressure was reduced to below Hg, and then an impregnating liquid (water glass) at 30° C. and a specific gravity of 1.29 was injected into the container 10 from the tank 11, and the pressure was increased to 6 kg/cm 2 for 15 minutes. The following table shows the number of water glasses blown out when the test pieces were dried at 60°C and 80°C after solidifying the water glass with 5N CH 3 COOH solution for 30 minutes.
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åºåæ°ã¯ãŒãã§ãã€ãã[Table] Therefore, it was found that those with a SiO 2 /Na 2 O molar ratio of 4.2 had excellent sealing performance. Therefore, this impregnation liquid was used to seal defects in aluminum die-cast parts of the front housing of an engine. The moisture content of the water glass was 70%, and the drying temperature was 60°C. The above die-cast part that has been subjected to the above treatment (no blowing out at all immediately after treatment)
A durability test was conducted under the conditions shown in Table 2. As a result, it was confirmed that the method of the present invention has durability and reliability that can be applied to actual equipment. In addition, instead of the above impregnating liquid with a SiO 2 /Na 2 O molar ratio of 5.0, an impregnating liquid with a SiO 2 /M 2 O molar ratio of 5.0 was used.
wt%, K2O 0.5wt%, Na2O 4.22wt%,
When a similar experiment was conducted using the composition of the remaining water (however, the drying temperature was only 60°C), the number of blowouts out of 20 was zero.
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ãã®ã§ãå·¥æ¥çæ矩ã倧ããã[Table] In the table, the mark â means there is no balloon, and the mark X means there is a balloon.
In the conventional heat treatment drying method using a water glass-based impregnating liquid, 80% of the aluminum die-cast parts were marked with an "X" under condition 1. On the other hand, when the SiO 2 /Na 2 O molar ratio was 3.4, under condition 1, 16% was similarly marked with an x mark. Next, under condition 2, when the SiO 2 /Na 2 O molar ratio was 3.4, 50% was marked with an x. The inventor also tried a method in which gel-like silica was precipitated by contacting water glass with CO 2 gas, but
The desired impregnation and sealing treatment could not be achieved. Therefore, it was found that even in the case of precipitation of gel-like silica, completely different results can be obtained depending on whether CO 2 or acid is used. In other words, the excellent overall properties of the present invention cannot be explained only by the precipitation of gel-like silica;
It can be said that the influence of high SiO 2 /M 2 O on the molar ratio reaction rate or the influence of other acids is decisive. Regardless of the theoretical explanation, the present invention has great industrial significance because the pressure resistance reliability of die-cast parts is greatly improved.
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Figures 1 and 2 are conceptual cross-sectional views of aluminum die-cast parts to explain the impregnation sealing treatment, and Figure 3 shows the influence of the SiO 2 /Na 2 O molar ratio of water glass on the reaction length. FIG. 4 is a cross-sectional view of the test piece, and FIG. 5 is a cross-sectional view of the impregnation treatment container. 1...Aluminum die-cast part, 2...Blow hole, 3...Impregnation liquid, 3'...Blowout, 4
...Steam bubbles.
Claims (1)
ããšãïŒçš®âã®ã¢ã«æ¯ãïŒãè¶ã5.1以äžã®æ°Žã¬
ã©ã¹ãã¢ã«ãããŠã ãã€ã«ã¹ãéšåã®æ¬ é¥éšã«å«
浞ãããåŸã該氎ã¬ã©ã¹ãé žæ¶²ãšæ¥è§Šãããããš
ãç¹åŸŽãšããã¢ã«ãããŠã ãã€ã«ã¹ãéšåå§æŽ©ã
æ¬ é¥ã®å«æµžå¯å°æ¹æ³ã1 After impregnating the defective parts of an aluminum die-cast part with water glass having a molar ratio of SiO 2 /M 2 O (where M is at least one alkali metal) of more than 4 and less than 5.1, the water glass is mixed with an acid solution. A method for impregnating and sealing a pressure leakage defect in an aluminum die-casting part, the method comprising contacting.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13738482A JPS5930780A (en) | 1982-08-09 | 1982-08-09 | Impregnation sealing method for aluminum die cast part pressure leak defect |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13738482A JPS5930780A (en) | 1982-08-09 | 1982-08-09 | Impregnation sealing method for aluminum die cast part pressure leak defect |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5930780A JPS5930780A (en) | 1984-02-18 |
JPS649128B2 true JPS649128B2 (en) | 1989-02-16 |
Family
ID=15197423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP13738482A Granted JPS5930780A (en) | 1982-08-09 | 1982-08-09 | Impregnation sealing method for aluminum die cast part pressure leak defect |
Country Status (1)
Country | Link |
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JP (1) | JPS5930780A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02141331U (en) * | 1989-05-01 | 1990-11-28 |
-
1982
- 1982-08-09 JP JP13738482A patent/JPS5930780A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02141331U (en) * | 1989-05-01 | 1990-11-28 |
Also Published As
Publication number | Publication date |
---|---|
JPS5930780A (en) | 1984-02-18 |
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