PENGARUH VARIASI TEKANAN SANDBLASTING TERHADAP LAPISAN HASIL POWDER COATING

Problematika kendaraan bermotor yang berbahan baja karbon rendah adalah korosi. Hampir semua komponen otomotif membutuhkan coating atau pengecatan dengan tujuan untuk melindungi struktur yang pada umumnya terbuat dari baja karbon dari serangan korosi. Ada banyak teknik dalam pengecatan, salah satunya adalah teknik powder coating, yaitu cat bubuk (powder) yang dapat dimuati listrik statis sehingga dapat memudahkan proses pengecatan menggunakan objek yang terbuat dari logam. Perlu dilakukan preparasi permukaan sebelum dilakukan proses powder coating. Preparasi yang umum dilakukan adalah dengan sandblasting, pemberian asam phospat atau amplas. Dari ketiga preparasi yang disebutkan, metode sandblasting yang dapat diatur tekanannya sehingga bisa mendapatkan kekasaran sesuai yang diinginkan. Sehingga dalam penelitian ini akan dibahas pengaruh variasi tekanan sandblasting (4, 5, dan 6 bar) terhadap lapisan powder coating yang terbentuk. Dari penelitian yang sudah dilakukan, spesimen dengan tekanan 5 bar menunjukkan ketahanan abrasi yang baik dan sudut kontak yang paling besar.

“An Investigation of wear behavior of TiO2 nanoparticles mixed with Hybrid powder coating on MS material”

To improve the wear resistance of the hybrid powder coating, TiO2 nanoparticles was hot mixed to form a homogenous mixture with the powder in the range varying wt. dry sliding wear test conducted to determine the wear resistance. The experiments were design according to Taguchi L9 array to find the optimum nanoparticles content required to minimize the wear rate of the coating. ANOVA was used to determine the effect of the parameters on wear rate. It showed that reinforcement has the maximum contribution on the wear rate of the coating as compared to load and frequency. From the graph of means optimum parametric values was obtained at 2 % wt of reinforcement, 2 N load and 2 Hz frequency. The wear rate decrease with the increase in reinforcement. Keywords: Taguchi Method, Tribometer, Hybrid powder, TiO2, Wear Rate.

Water transport through epoxy-based powder pipeline coatings

Hydration of epoxy coatings reduces adhesion performance and causes degradation of the material, such as microstructural failures. Quantification of water vapor transport at elevated temperatures is fundamental to understanding polymer coating performance, especially when the coating is exposed to extreme operating conditions. As the water activity increases, the permeability/selectivity of polymers against other permeants changes. In this study, we examined the water permeation kinetics of two common epoxy-based powder coating systems for pipelines (fusion-bonded epoxy, FBE, and high-performance powder coating, HPPC) across a range of industrially-relevant temperatures (from room temperature to 80°C). Specifically, we utilized vapor permeation features of FBE and HPPC films with quantification of equilibrium flux as a function of temperature and pressure. In addition, we analyzed the nonlinear dependency of water transport on the vapor concentration at 65°C. The vapor transport analysis demonstrated that although data for FBE were indicative of a decrease in permeability around 65°C, perhaps due to self-association of water molecules, the coating was likely to experience a plasticization pressure around this temperature. We also examined microstructural changes of the epoxy network due to water transport. Our results revealed evidence of irreversible damage to epoxy coatings under wet-state conditions above 65°C. It appears that the combination of thermal exposure and internal stresses in the glassy epoxy lead to a phase separation of filler particles from the epoxy matrix, as well as to a distinctive cavity formation in the coating membrane. Yet, despite formation of percolating paths for water transport, our results indicate that vapor permeation is primarily restrained due to self-association of water molecules. The vapor transport flux and its permeance are lowered by one order of magnitude in the multilayered HPPC thanks to the moisture-resistant polyethylene topcoat, thus reducing the extent of damage to the underlying substrate. Since barrier protection against gas phase diffusion is controlled by the FBE primer, however, consequences of coating hydration are more pronounced in the overall selectivity toward gaseous transport. Hydrothermal exposure is likely to increase aggregate porosity of the coating and a conservative implementation of standard coating requirements is therefore reasonable to avoid early degradation issues.

Wear of the PG-CP4 coating applied by plasma to 40H13 steel and subjected to laser treatment

This paper discusses the wear of PG-CP4 powder coating deposited by plasma on 40H13 steel and treated by laser. A multi-factor model was established that relates the absolute wear of the PG-CP4 coating to independent factors of the laser processing process and allows you to reduce the coating wear. The longitudinal feed Spr of the laser beam and distance L from the protective glass of the laser head to the processed surface have the greatest and approximately equal influence on the absolute wear of the coating, and the radiation power W -a minimum influence. The research of 40H13 steel coated (the first option) and uncoated steel (the second option), showed that of all the samples that provide reliable adhesion of the coating to the substrate and the greatest reduction in absolute wear (from 80 to 22 micrometers, by 72.5 %) was achieved in the first case at the mode: W = 3 kW, Spr = 10 mm/s and L = 60 mm. The results of the research are recommended for use in enterprises that implement the processes of plasma and laser processing of materials, as well as in design organizations that develop modern technological laser systems.

Manufacturing Process And Tonase Calculation On Bumper Rear Axle Bracket Rh

Rear Axle Bumper Bracket is a non-frame part of the car that functions to connect the bumper itself to the rear axle and to withstand collisions and also reduce collisions. Rear Axle Bumper Brackets are commonly used for vehicle components. This writing aims to determine the process of making the Rear Axle RH Bumper Bracket and the total force in the blanking (cutting) process and also in the bending (bending) process of the RH Rear Axle Bumper Bracket Lower Part. Bumper Rear Axle Bracket RH is made by going through a material formation process by cutting blanking and bending, followed by a welding process using spot welding to the painting stage using a powder coating method of dipping. Based on the results of calculations using SPH 440 OD material for the main material for making Bracket Bumper Rear Axle RH Lower Part, it was found that the amount of tonnage that occurred in the blanking process (cutting) was 84.09 Tons with an added reserve force of 8.41 Tons with a value of 84.09 Tons. safety factor of 1.3 which has been standardized on the use of static loads so as to produce the capacity of the press machine needed for the blanking process (cutting) which is 120.25 tons with the actual press machine used of 110 tons. For the bending process, it can be done with a total bending force of 27.19 tons with the added pad force in the bending process of 6.8 tons so that the total force on the Press machine needed for the bending process is 34 tons with the actual press machine. used is 110 tons.

PENERAPAN PENGECATAN POWDER COATING FLUIDS PADA PERBAIKAN GEROBAK SAMPAH DI KELURAHAN SERENGAN SURAKARTA

Gerobak sampah merupakan sarana kebersihan yang berfungsi mengangkut sampah lingkungan masyarakat kelurahan serengan pada khususnya. Alat tersebut bermanfaat kepada kesehatan lingkungan bisa terhindar dari polusi udara. Dewasa ini penggunaan gerobak sampah lebih tinggi dari pada perawatannya. Ada 2 gerobak sampah yang dalam kondisi rusak, keropos dan tidak layak pakai. Pada kegiatan ini bertujuan untuk melakukan perbaikan kondisi gerobak sampah yang dititik beratkan kepada pengecatan serbuk. Metode pelaksanaan pengabdian masyarakat ini meliputi survei di kelurahan serengan, pembongkaran, pengelasan dan pengecatan sistem serbuk. Hasil yang dicapai dari kegiatan ini adalah 2 gerobak sampah yang sudah diperbaiki dan layak pakai, dan menyerahkan kembali ke petugas sampah untuk dioperasikan secara nyaman dan aman serta sehat. Disamping itu juga mampu membangkitkan motivasi kepada warga untuk gemar buang sampah pada tempatnya.