In view of the real-time, reliable and efficient requirements in data transmission of the automatic meter reading system, a remote automatic meter reading scheme based on the technology of Wi-Fi is proposed. Wi-Fi (sometimes spelled Wifi or WiFi) is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connections. Based on the transmission technology of Wi-Fi, this article introduces a remote automatic meter reading system, which takes UART-WiFi module as core and allows the meter connected to the Internet, so as to realize the function of network remote automatic meter reading.

The effects of the surface roughness on electro-deposition properties of the special nickel electroplating coating for the 45# steel were investigated. The results indicate that the surface roughness has great effects on the corrosion resistance and the surface hardness of the coating, the adhesion force between the coating and the substrate. Among the three 45# samples with different surface roughnesses, the sample with moderate surface roughness (Ra≈0.1um) has the relatively higher corrosion resistance, surface hardness and adhesion force than the samples with higher and lower surface roughness.

Corrosion properties of magnesium alloys coupled with foreign metals impose much influence on the life of the parts. In this paper, the corrosion properties of AZ31 magnesium alloy coupled with nitrided 40Cr steel were investigated through immersion test in saline solution and weight loss test combining with optical microscope (OM) and scanning electronic microscope (SEM) analysis. The results indicate that the anticorrosion properties of the AZ31 magnesium alloy coupled with nitrided 40Cr steel are higher than those of the AZ31 magnesium alloy coupled with unnitrided 40Cr steel. The mechanism is attributed to the resultant nitrided layer which reduces the conductive properties.

In recent years, excellent cytocompatability of magnesium alloy in addition to the bioactivity, biodegradation and match of mechanical properties is increasingly indispensable for biomedical applications. Surface modification by single inorganic or polymer coating provides inadequate functionality in reducing corrosion rate and improving cytobiocopatibility, bioactive polymer composite coatings are supposed to draw on multiple merits of individual component materials and may present a new trend to develop Magnesium alloy biomaterials with promising properties. This review focuses on the effects of polymer composite coatings and their preparations through sealing micro pores in inorganic coating, low temperature deposition techniques, biomemitic synthesis as well as controllable bioactive composite coating by virtue of irradiation modification.

Nano TiO2and S, N co-doped TiO2composite coatings with WO3transitional layer were deposited on AZ31 magnesium alloy by sol-gel method. The morphologies, structure, mechanical properties, compositional depth profiles and anti-corrosion performance of the as prepared coatings were characterized by scanning electron microscope, X-ray diffraction, nanoscratch test, glowing discharge optical emission spectrometry and electrochemical method, respectively. The results show that the nano TiO2coatings are continuous, uniform and dense with thickness ca.3-5μm, elements in the interface diffuse mutually during heat treatment; S-N co-doped TiO2enhances the interface adhesion, WO3transitional layer increases the total coating thickness and strengthens the adhesion to substrate with respect to unitary TiO2coating; S, N co-doped TiO2acts as visible light photocatalyst that can provide permanent cathodic protection for AZ31 magnesium using WO3as electron restoring material.