[26; 27] proposed a creep equation for sandstone under chemical corrosion based on the influence of effective stress and pH value of the solution and verified the rationality of the creep model. [PERSON] et al. [28; 29] analyzed the creep mechanism of rock under chemical corrosion and established the creep equation of rock under chemical corrosion using a combination of experiment and simulation. [PERSON] et al. [30] established a creep damage model for brittle rock under the coupled effect of temperature and stress based on the basic theories of rock deformation, thermodynamics, and damage mechanics. [PERSON] et al. [31] conducted multistage creep tests on rocks with cracks at different temperatures and confining pressures and studied the effects of temperature, confining pressure, and cracks on rock creep characteristics. [PERSON] et al. [32] used fractal theory to describe the pore development characteristics of white sandstone under the coupled action of chemical corrosion and temperature and investigated the relationship between the pore characteristics and mechanical properties of white sandstone under the coupled action of chemical corrosion and temperature. [PERSON] et al. [33; 34] investigated the creep test and model of slate under NaCl solution corrosion and proposed a nonlinear viscoelastic-plastic creep model considering chemical damage factors. [PERSON] et al. [35; 36; 37; 38] studied the microstructure of rocks under thermomechanical coupling, conducted macromechanics experiments, and established a rheological model of rocks under thermomechanical coupling. [PERSON] et al. [39; 40] conducted uniaxial compression tests and long-term uniaxial creep tests on rocks in various chemical environments and analyzed the impacts of the various chemical environments on the uniaxial compressive strength, long-term strength, and elastic modulus of the rocks. [PERSON] et al. [41] conducted a triaxial compressive test on water-saturated kaolin at different temperatures (22 \({}^{\circ}\)C and 90 \({}^{\circ}\)C) and analyzed the effects of different temperatures on the shear strength, elastic modulus, and triaxial compressive strength of water-saturated kaolin. [PERSON], [PERSON] et al. [42] investigated the mechanical performance of shale under different temperatures and discovered that the shale's creep strain gradually increased as the temperature increased. [PERSON]. [PERSON] et al. [43] conducted a triaxial creep study on three types of sandstones in different regions at different temperatures and discovered that the strength of each sandstone gradually decreased as the temperature increased. Most earlier studies on the creep behavior of rock have focused on a single factor, such as temperature and chemical corrosion, and have seldom considered both influencing factors simultaneously. We discovered that the Nishihara model is an exceptionally effective way of studying sandstone creep. This study focuses on describing the accelerated creep stage by defining new viscoplastic elements and introducing damage variables. However, when this is compared with the actual creep data, there will be a significant difference. Based on previous research, this study investigates the effect of temperature and chemical corrosion on the creep characteristics of sandstone and combines the evolution law of creep rate with temperature and chemical corrosion during the test. A viscoelastic element that describes the effects of temperature and chemical corrosion on creep rate is constructed by introducing damage factors that vary with temperature and pH. To describe the effect of temperature and pH on the creep properties of sandstone, the viscoelastic element in the Nishihara model is replaced with a newly constructed viscoelastic element and a nonlinear viscoplastic element is introduced in the Nishihara model to describe the accelerated creep stage of rock. A nonlinear creep model under the coupled effect of chemical corrosion and temperature is established after two revisions to the Nishihara creep model.